updated docs strings and added README.md

Reviewed-on: #2
Co-authored-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>
Co-committed-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>

.gitignore

@@ -38,3 +38,4 @@ Thumbs.db
 *.swo
 *~
 *.tmp
+site

README.md

@@ -0,0 +1,96 @@
+# openapi_first
+
+# Summary
+
+FastAPI OpenAPI First — strict OpenAPI-first application bootstrap for FastAPI.
+
+FastAPI OpenAPI First is a **contract-first infrastructure library** that
+enforces OpenAPI as the single source of truth for FastAPI services.
+
+The library removes decorator-driven routing and replaces it with
+deterministic, spec-driven application assembly. Every HTTP route,
+method, and operation is defined in OpenAPI first and bound to Python
+handlers explicitly via `operationId`.
+
+---
+
+# Installation
+
+Install using pip:
+
+```bash
+pip install openapi-first
+```
+
+Or with Poetry:
+
+```bash
+poetry add openapi-first
+```
+
+---
+
+# Quick Start
+
+Minimal OpenAPI-first FastAPI application:
+
+```python
+from openapi_first import app
+import my_service.routes as routes
+
+api = app.OpenAPIFirstApp(
+    openapi_path="openapi.yaml",
+    routes_module=routes,
+    title="My Service",
+    version="1.0.0",
+)
+```
+
+OperationId-driven HTTP client:
+
+```python
+from openapi_first.loader import load_openapi
+from openapi_first.client import OpenAPIClient
+
+spec = load_openapi("openapi.yaml")
+client = OpenAPIClient(spec)
+
+response = client.get_health()
+```
+
+---
+
+# Architecture
+
+The library is structured around four core responsibilities:
+
+- `loader`: Load and validate OpenAPI 3.x specifications (JSON/YAML).
+- `binder`: Bind OpenAPI operations to FastAPI routes via `operationId`.
+- `app`: OpenAPI-first FastAPI application bootstrap.
+- `client`: OpenAPI-first HTTP client driven by the same specification.
+- `errors`: Explicit error hierarchy for contract violations.
+
+---
+
+# Public API
+
+The supported public API consists of the following top-level modules:
+
+- `openapi_first.app`
+- `openapi_first.binder`
+- `openapi_first.loader`
+- `openapi_first.client`
+- `openapi_first.errors`
+
+---
+
+# Design Guarantees
+
+- OpenAPI is the single source of truth.
+- No undocumented routes can exist.
+- No OpenAPI operation can exist without a handler or client callable.
+- All contract violations fail at application startup or client creation.
+- No hidden FastAPI magic or implicit behavior.
+- Deterministic, testable application assembly.
+
+---

docforge.nav.yml

@@ -0,0 +1,10 @@
+home: index.md
+groups:
+  Application Bootstrap:
+    - app.md
+    - binder.md
+  Core Utilities:
+    - loader.md
+    - errors.md
+  OpenAPI Client:
+    - client.md

docs/client.md

@@ -0,0 +1,3 @@
+# Client
+
+::: openapi_first.client

docs/index.md

@@ -1,3 +1,3 @@
-# Openapi First
+# openapi_first
 
 ::: openapi_first

docs/templates/crud_app/data.md

@@ -0,0 +1,3 @@
+# Data
+
+::: openapi_first.templates.crud_app.data

docs/templates/crud_app/index.md

@@ -0,0 +1,3 @@
+# Crud App
+
+::: openapi_first.templates.crud_app

docs/templates/crud_app/main.md

@@ -0,0 +1,3 @@
+# Main
+
+::: openapi_first.templates.crud_app.main

docs/templates/crud_app/routes.md

@@ -0,0 +1,3 @@
+# Routes
+
+::: openapi_first.templates.crud_app.routes

docs/templates/crud_app/test_crud_app.md

@@ -0,0 +1,3 @@
+# Test Crud App
+
+::: openapi_first.templates.crud_app.test_crud_app

docs/templates/health_app/index.md

@@ -0,0 +1,3 @@
+# Health App
+
+::: openapi_first.templates.health_app

docs/templates/health_app/main.md

@@ -0,0 +1,3 @@
+# Main
+
+::: openapi_first.templates.health_app.main

docs/templates/health_app/routes.md

@@ -0,0 +1,3 @@
+# Routes
+
+::: openapi_first.templates.health_app.routes

docs/templates/index.md

@@ -0,0 +1,3 @@
+# Templates
+
+::: openapi_first.templates

docs/templates/model_app/data.md

@@ -0,0 +1,3 @@
+# Data
+
+::: openapi_first.templates.model_app.data

docs/templates/model_app/index.md

@@ -0,0 +1,3 @@
+# Model App
+
+::: openapi_first.templates.model_app

docs/templates/model_app/main.md

@@ -0,0 +1,3 @@
+# Main
+
+::: openapi_first.templates.model_app.main

docs/templates/model_app/models.md

@@ -0,0 +1,3 @@
+# Models
+
+::: openapi_first.templates.model_app.models

docs/templates/model_app/routes.md

@@ -0,0 +1,3 @@
+# Routes
+
+::: openapi_first.templates.model_app.routes

docs/templates/model_app/test_model_app.md

@@ -0,0 +1,3 @@
+# Test Model App
+
+::: openapi_first.templates.model_app.test_model_app

manage_docs.py

@@ -1,159 +0,0 @@
-"""
-MkDocs documentation management CLI.
-
-This script provides a proper CLI interface to:
-- Generate MkDocs Markdown files with mkdocstrings directives
-- Build the documentation site
-- Serve the documentation site locally
-
-All operations are performed by calling MkDocs as a Python library
-(no shell command invocation).
-
-Requirements:
-- mkdocs
-- mkdocs-material
-- mkdocstrings[python]
-
-Usage:
-    python manage_docs.py generate
-    python manage_docs.py build
-    python manage_docs.py serve
-
-Optional flags:
-    --docs-dir PATH        Path to docs directory (default: ./docs)
-    --package-root NAME    Root Python package name (default: mail_intake)
-"""
-
-from __future__ import annotations
-
-import argparse
-from pathlib import Path
-
-from mkdocs.commands import build as mkdocs_build
-from mkdocs.commands import serve as mkdocs_serve
-from mkdocs.config import load_config
-
-
-PROJECT_ROOT = Path(__file__).resolve().parent
-DEFAULT_DOCS_DIR = PROJECT_ROOT / "docs"
-DEFAULT_PACKAGE_ROOT = "openapi_first"
-MKDOCS_YML = PROJECT_ROOT / "mkdocs.yml"
-
-
-def generate_docs_from_nav(
-    project_root: Path,
-    docs_root: Path,
-    package_root: str,
-) -> None:
-    """
-    Create and populate MkDocs Markdown files with mkdocstrings directives.
-
-    This function:
-    - Walks the Python package structure
-    - Mirrors it under the docs directory
-    - Creates missing .md files
-    - Creates index.md for packages (__init__.py)
-    - Overwrites content with ::: package.module
-
-    Examples:
-        mail_intake/__init__.py           -> docs/mail_intake/index.md
-        mail_intake/config.py             -> docs/mail_intake/config.md
-        mail_intake/adapters/__init__.py  -> docs/mail_intake/adapters/index.md
-        mail_intake/adapters/base.py      -> docs/mail_intake/adapters/base.md
-    """
-
-    package_dir = project_root / package_root
-    if not package_dir.exists():
-        raise FileNotFoundError(f"Package not found: {package_dir}")
-
-    docs_root.mkdir(parents=True, exist_ok=True)
-
-    for py_file in package_dir.rglob("*.py"):
-        rel = py_file.relative_to(project_root)
-
-        if py_file.name == "__init__.py":
-            # Package → index.md
-            module_path = ".".join(rel.parent.parts)
-            md_path = docs_root / rel.parent / "index.md"
-            title = rel.parent.name.replace("_", " ").title()
-        else:
-            # Regular module → <module>.md
-            module_path = ".".join(rel.with_suffix("").parts)
-            md_path = docs_root / rel.with_suffix(".md")
-            title = md_path.stem.replace("_", " ").title()
-
-        md_path.parent.mkdir(parents=True, exist_ok=True)
-
-        content = f"""# {title}
-
-::: {module_path}
-"""
-
-        md_path.write_text(content, encoding="utf-8")
-
-
-def load_mkdocs_config():
-    if not MKDOCS_YML.exists():
-        raise FileNotFoundError("mkdocs.yml not found at project root")
-    return load_config(str(MKDOCS_YML))
-
-
-def cmd_generate(args: argparse.Namespace) -> None:
-    generate_docs_from_nav(
-        project_root=PROJECT_ROOT,
-        docs_root=args.docs_dir,
-        package_root=args.package_root,
-    )
-
-
-def cmd_build(_: argparse.Namespace) -> None:
-    config = load_mkdocs_config()
-    mkdocs_build.build(config)
-
-
-def cmd_serve(_: argparse.Namespace) -> None:
-    mkdocs_serve.serve(
-        config_file=str(MKDOCS_YML)
-    )
-
-def main() -> None:
-    parser = argparse.ArgumentParser(
-        prog="manage_docs.py",
-        description="Manage MkDocs documentation for the project",
-    )
-
-    parser.add_argument(
-        "--docs-dir",
-        type=Path,
-        default=DEFAULT_DOCS_DIR,
-        help="Path to the docs directory",
-    )
-    parser.add_argument(
-        "--package-root",
-        default=DEFAULT_PACKAGE_ROOT,
-        help="Root Python package name",
-    )
-
-    subparsers = parser.add_subparsers(dest="command", required=True)
-
-    subparsers.add_parser(
-        "generate",
-        help="Generate Markdown files with mkdocstrings directives",
-    ).set_defaults(func=cmd_generate)
-
-    subparsers.add_parser(
-        "build",
-        help="Build the MkDocs site",
-    ).set_defaults(func=cmd_build)
-
-    subparsers.add_parser(
-        "serve",
-        help="Serve the MkDocs site locally",
-    ).set_defaults(func=cmd_serve)
-
-    args = parser.parse_args()
-    args.func(args)
-
-
-if __name__ == "__main__":
-    main()

mcp_docs/index.json

@@ -0,0 +1,6 @@
+{
+  "project": "openapi_first",
+  "type": "docforge-model",
+  "modules_count": 22,
+  "source": "docforge"
+}

mcp_docs/modules/openapi_first.app.json

@@ -0,0 +1,53 @@
+{
+  "module": "openapi_first.app",
+  "content": {
+    "path": "openapi_first.app",
+    "docstring": "# Summary\n\nOpenAPI-first application bootstrap for FastAPI.\n\nThis module provides `OpenAPIFirstApp`, a thin but strict abstraction\nthat enforces OpenAPI as the single source of truth for a FastAPI service.\n\nNotes:\n    **Core Principles:**\n\n        - The OpenAPI specification (JSON or YAML) defines the entire API surface.\n        - Every `operationId` in the OpenAPI spec must have a corresponding\n          Python handler function.\n        - Handlers are plain Python callables (no FastAPI decorators).\n        - FastAPI route registration is derived exclusively from the spec.\n        - FastAPI's autogenerated OpenAPI schema is fully overridden.\n\n    **Responsibilities:**\n\n        - Loads and validates an OpenAPI 3.x specification.\n        - Dynamically binds HTTP routes to handler functions using `operationId`.\n        - Registers routes with FastAPI at application startup.\n        - Ensures runtime behavior matches the OpenAPI contract exactly.\n\n    **Constraints:**\n\n        - This module intentionally does NOT:\n            - Generate OpenAPI specs.\n            - Generate client code.\n            - Introduce a new framework or lifecycle.\n            - Alter FastAPI dependency injection semantics.",
+    "objects": {
+      "FastAPI": {
+        "name": "FastAPI",
+        "kind": "alias",
+        "path": "openapi_first.app.FastAPI",
+        "signature": "<bound method Alias.signature of Alias('FastAPI', 'fastapi.FastAPI')>",
+        "docstring": null
+      },
+      "load_openapi": {
+        "name": "load_openapi",
+        "kind": "function",
+        "path": "openapi_first.app.load_openapi",
+        "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+        "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+      },
+      "bind_routes": {
+        "name": "bind_routes",
+        "kind": "function",
+        "path": "openapi_first.app.bind_routes",
+        "signature": "<bound method Alias.signature of Alias('bind_routes', 'openapi_first.binder.bind_routes')>",
+        "docstring": "Bind OpenAPI operations to FastAPI routes.\n\nArgs:\n    app (fastapi.FastAPI):\n        The FastAPI application instance to which routes will be added.\n    spec (dict):\n        Parsed OpenAPI 3.x specification dictionary.\n    routes_module (module):\n        Python module containing handler functions. Each handler's name MUST\n        exactly match an OpenAPI `operationId`.\n\nRaises:\n    MissingOperationHandler:\n        If an `operationId` is missing from the spec or if no corresponding\n        handler function exists in the routes module.\n\nNotes:\n    **Responsibilities:**\n\n        - Iterates through the OpenAPI specification paths and methods.\n        - Resolves each `operationId` to a handler function, and registers\n          a corresponding `APIRoute` on the FastAPI application.\n\n    **Guarantees:**\n\n        - Route registration is deterministic and spec-driven. No route\n          decorators are required or supported. Handler resolution errors\n          surface at application startup."
+      },
+      "OpenAPIFirstApp": {
+        "name": "OpenAPIFirstApp",
+        "kind": "class",
+        "path": "openapi_first.app.OpenAPIFirstApp",
+        "signature": "<bound method Class.signature of Class('OpenAPIFirstApp', 41, 115)>",
+        "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+        "members": {
+          "openapi": {
+            "name": "openapi",
+            "kind": "attribute",
+            "path": "openapi_first.app.OpenAPIFirstApp.openapi",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      },
+      "Any": {
+        "name": "Any",
+        "kind": "alias",
+        "path": "openapi_first.app.Any",
+        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.binder.json

@@ -0,0 +1,51 @@
+{
+  "module": "openapi_first.binder",
+  "content": {
+    "path": "openapi_first.binder",
+    "docstring": "# Summary\n\nOpenAPI-driven route binding for FastAPI.\n\nThis module is responsible for translating an OpenAPI 3.x specification\ninto concrete FastAPI routes. It enforces a strict one-to-one mapping\nbetween OpenAPI operations and Python handler functions using `operationId`.\n\nNotes:\n    **Core Responsibility:**\n\n        - Read path + method definitions from an OpenAPI specification.\n        - Resolve each `operationId` to a Python callable.\n        - Register routes with FastAPI using `APIRoute`.\n        - Fail fast when contract violations are detected.\n\n    **Design Constraints:**\n\n        - All routes MUST be declared in the OpenAPI specification.\n        - All OpenAPI operations MUST define an `operationId`.\n        - Every `operationId` MUST resolve to a handler function.\n        - Handlers are plain Python callables (no decorators required).\n        - No implicit route creation or inference is allowed.\n\n    **Constraints:**\n\n        - This module intentionally does NOT:\n            - Perform request or response validation.\n            - Generate Pydantic models.\n            - Modify FastAPI dependency injection.\n            - Interpret OpenAPI semantics beyond routing metadata.",
+    "objects": {
+      "APIRoute": {
+        "name": "APIRoute",
+        "kind": "alias",
+        "path": "openapi_first.binder.APIRoute",
+        "signature": "<bound method Alias.signature of Alias('APIRoute', 'fastapi.routing.APIRoute')>",
+        "docstring": null
+      },
+      "MissingOperationHandler": {
+        "name": "MissingOperationHandler",
+        "kind": "class",
+        "path": "openapi_first.binder.MissingOperationHandler",
+        "signature": "<bound method Alias.signature of Alias('MissingOperationHandler', 'openapi_first.errors.MissingOperationHandler')>",
+        "docstring": "Raised when an OpenAPI operation cannot be resolved to a handler.\n\nNotes:\n    **Scenarios:**\n\n        - An OpenAPI operation does not define an `operationId`.\n        - An `operationId` is defined but no matching function exists in\n          the provided routes module.\n\n    **Guarantees:**\n\n        - This represents a violation of the OpenAPI-first contract and\n          indicates that the specification and implementation are out of\n          sync."
+      },
+      "bind_routes": {
+        "name": "bind_routes",
+        "kind": "function",
+        "path": "openapi_first.binder.bind_routes",
+        "signature": "<bound method Function.signature of Function('bind_routes', 40, 100)>",
+        "docstring": "Bind OpenAPI operations to FastAPI routes.\n\nArgs:\n    app (fastapi.FastAPI):\n        The FastAPI application instance to which routes will be added.\n    spec (dict):\n        Parsed OpenAPI 3.x specification dictionary.\n    routes_module (module):\n        Python module containing handler functions. Each handler's name MUST\n        exactly match an OpenAPI `operationId`.\n\nRaises:\n    MissingOperationHandler:\n        If an `operationId` is missing from the spec or if no corresponding\n        handler function exists in the routes module.\n\nNotes:\n    **Responsibilities:**\n\n        - Iterates through the OpenAPI specification paths and methods.\n        - Resolves each `operationId` to a handler function, and registers\n          a corresponding `APIRoute` on the FastAPI application.\n\n    **Guarantees:**\n\n        - Route registration is deterministic and spec-driven. No route\n          decorators are required or supported. Handler resolution errors\n          surface at application startup."
+      },
+      "Any": {
+        "name": "Any",
+        "kind": "alias",
+        "path": "openapi_first.binder.Any",
+        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
+        "docstring": null
+      },
+      "Dict": {
+        "name": "Dict",
+        "kind": "alias",
+        "path": "openapi_first.binder.Dict",
+        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+        "docstring": null
+      },
+      "FastAPI": {
+        "name": "FastAPI",
+        "kind": "alias",
+        "path": "openapi_first.binder.FastAPI",
+        "signature": "<bound method Alias.signature of Alias('FastAPI', 'fastapi.FastAPI')>",
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.cli.json

@@ -0,0 +1,65 @@
+{
+  "module": "openapi_first.cli",
+  "content": {
+    "path": "openapi_first.cli",
+    "docstring": "Command-line interface for FastAPI OpenAPI-first scaffolding utilities.\n\n---\n\n## Summary\n\nThis CLI bootstraps OpenAPI-first FastAPI applications from versioned,\nbundled templates packaged with the library.",
+    "objects": {
+      "argparse": {
+        "name": "argparse",
+        "kind": "alias",
+        "path": "openapi_first.cli.argparse",
+        "signature": "<bound method Alias.signature of Alias('argparse', 'argparse')>",
+        "docstring": null
+      },
+      "shutil": {
+        "name": "shutil",
+        "kind": "alias",
+        "path": "openapi_first.cli.shutil",
+        "signature": "<bound method Alias.signature of Alias('shutil', 'shutil')>",
+        "docstring": null
+      },
+      "Path": {
+        "name": "Path",
+        "kind": "alias",
+        "path": "openapi_first.cli.Path",
+        "signature": "<bound method Alias.signature of Alias('Path', 'pathlib.Path')>",
+        "docstring": null
+      },
+      "resources": {
+        "name": "resources",
+        "kind": "alias",
+        "path": "openapi_first.cli.resources",
+        "signature": "<bound method Alias.signature of Alias('resources', 'importlib.resources')>",
+        "docstring": null
+      },
+      "DEFAULT_TEMPLATE": {
+        "name": "DEFAULT_TEMPLATE",
+        "kind": "attribute",
+        "path": "openapi_first.cli.DEFAULT_TEMPLATE",
+        "signature": null,
+        "docstring": null
+      },
+      "available_templates": {
+        "name": "available_templates",
+        "kind": "function",
+        "path": "openapi_first.cli.available_templates",
+        "signature": "<bound method Function.signature of Function('available_templates', 21, 34)>",
+        "docstring": "Return a list of available application templates.\n\nReturns:\n    list[str]:\n        Sorted list of template names found in the internal templates directory."
+      },
+      "copy_template": {
+        "name": "copy_template",
+        "kind": "function",
+        "path": "openapi_first.cli.copy_template",
+        "signature": "<bound method Function.signature of Function('copy_template', 37, 64)>",
+        "docstring": "Copy a bundled OpenAPI-first application template into a directory.\n\nArgs:\n    template (str):\n        Name of the template to copy.\n    target_dir (Path):\n        Filesystem path where the template should be copied.\n\nRaises:\n    FileNotFoundError:\n        If the requested template does not exist."
+      },
+      "main": {
+        "name": "main",
+        "kind": "function",
+        "path": "openapi_first.cli.main",
+        "signature": "<bound method Function.signature of Function('main', 67, 103)>",
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.client.json

@@ -0,0 +1,102 @@
+{
+  "module": "openapi_first.client",
+  "content": {
+    "path": "openapi_first.client",
+    "docstring": "# Summary\n\nOpenAPI-first HTTP client for contract-driven services.\n\nThis module provides `OpenAPIClient`, a thin, strict HTTP client that\nderives all callable operations directly from an OpenAPI 3.x specification.\n\nIt is the client counterpart to `OpenAPIFirstApp`.\n\nNotes:\n    **Core Principles:**\n\n        - The OpenAPI specification is the single source of truth\n        - Each operationId becomes a callable Python method\n        - No implicit schema mutation or inference\n        - No code generation step\n        - Minimal abstraction over httpx\n\n    **Responsibilities:**\n\n        - Parses an OpenAPI 3.x specification\n        - Dynamically creates one callable per operationId\n        - Enforces presence of servers, paths, and operationId\n        - Formats path parameters safely\n        - Handles JSON request bodies explicitly\n        - Returns raw `httpx.Response` objects\n\n    **Constraints:**\n\n        - This module intentionally does NOT: Generate client code, validate request/response schemas, deserialize responses, retry requests, implement authentication helpers, or assume non-2xx responses are failures.",
+    "objects": {
+      "Any": {
+        "name": "Any",
+        "kind": "alias",
+        "path": "openapi_first.client.Any",
+        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
+        "docstring": null
+      },
+      "Callable": {
+        "name": "Callable",
+        "kind": "alias",
+        "path": "openapi_first.client.Callable",
+        "signature": "<bound method Alias.signature of Alias('Callable', 'typing.Callable')>",
+        "docstring": null
+      },
+      "Dict": {
+        "name": "Dict",
+        "kind": "alias",
+        "path": "openapi_first.client.Dict",
+        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+        "docstring": null
+      },
+      "Optional": {
+        "name": "Optional",
+        "kind": "alias",
+        "path": "openapi_first.client.Optional",
+        "signature": "<bound method Alias.signature of Alias('Optional', 'typing.Optional')>",
+        "docstring": null
+      },
+      "urljoin": {
+        "name": "urljoin",
+        "kind": "alias",
+        "path": "openapi_first.client.urljoin",
+        "signature": "<bound method Alias.signature of Alias('urljoin', 'urllib.parse.urljoin')>",
+        "docstring": null
+      },
+      "httpx": {
+        "name": "httpx",
+        "kind": "alias",
+        "path": "openapi_first.client.httpx",
+        "signature": "<bound method Alias.signature of Alias('httpx', 'httpx')>",
+        "docstring": null
+      },
+      "OpenAPIFirstError": {
+        "name": "OpenAPIFirstError",
+        "kind": "class",
+        "path": "openapi_first.client.OpenAPIFirstError",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIFirstError', 'openapi_first.errors.OpenAPIFirstError')>",
+        "docstring": "Base exception for all OpenAPI-first enforcement errors.\n\nNotes:\n    **Responsibilities:**\n\n        - This exception exists to allow callers, test suites, and CI\n          pipelines to catch and distinguish OpenAPI contract violations\n          from unrelated runtime errors.\n        - All exceptions raised by the OpenAPI-first core should inherit\n          from this type."
+      },
+      "OpenAPIClientError": {
+        "name": "OpenAPIClientError",
+        "kind": "class",
+        "path": "openapi_first.client.OpenAPIClientError",
+        "signature": "<bound method Class.signature of Class('OpenAPIClientError', 42, 45)>",
+        "docstring": "Raised when an OpenAPI client operation fails."
+      },
+      "OpenAPIClient": {
+        "name": "OpenAPIClient",
+        "kind": "class",
+        "path": "openapi_first.client.OpenAPIClient",
+        "signature": "<bound method Class.signature of Class('OpenAPIClient', 48, 257)>",
+        "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+        "members": {
+          "spec": {
+            "name": "spec",
+            "kind": "attribute",
+            "path": "openapi_first.client.OpenAPIClient.spec",
+            "signature": null,
+            "docstring": null
+          },
+          "base_url": {
+            "name": "base_url",
+            "kind": "attribute",
+            "path": "openapi_first.client.OpenAPIClient.base_url",
+            "signature": null,
+            "docstring": null
+          },
+          "client": {
+            "name": "client",
+            "kind": "attribute",
+            "path": "openapi_first.client.OpenAPIClient.client",
+            "signature": null,
+            "docstring": null
+          },
+          "operations": {
+            "name": "operations",
+            "kind": "function",
+            "path": "openapi_first.client.OpenAPIClient.operations",
+            "signature": "<bound method Function.signature of Function('operations', 126, 127)>",
+            "docstring": null
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.errors.json

@@ -0,0 +1,30 @@
+{
+  "module": "openapi_first.errors",
+  "content": {
+    "path": "openapi_first.errors",
+    "docstring": "# Summary\n\nExceptions for OpenAPI-first FastAPI applications.\n\nThis module defines a small hierarchy of explicit, intention-revealing\nexceptions used to signal contract violations between an OpenAPI\nspecification and its Python implementation.\n\nNotes:\n    **Design Principles:**\n\n        - Errors represent programmer mistakes, not runtime conditions.\n        - All errors are raised during application startup.\n        - Messages are actionable and suitable for CI/CD output.\n        - Exceptions are explicit rather than reused from generic built-ins.\n\n    These errors should normally cause immediate application failure.",
+    "objects": {
+      "OpenAPIFirstError": {
+        "name": "OpenAPIFirstError",
+        "kind": "class",
+        "path": "openapi_first.errors.OpenAPIFirstError",
+        "signature": "<bound method Class.signature of Class('OpenAPIFirstError', 21, 34)>",
+        "docstring": "Base exception for all OpenAPI-first enforcement errors.\n\nNotes:\n    **Responsibilities:**\n\n        - This exception exists to allow callers, test suites, and CI\n          pipelines to catch and distinguish OpenAPI contract violations\n          from unrelated runtime errors.\n        - All exceptions raised by the OpenAPI-first core should inherit\n          from this type."
+      },
+      "MissingOperationHandler": {
+        "name": "MissingOperationHandler",
+        "kind": "class",
+        "path": "openapi_first.errors.MissingOperationHandler",
+        "signature": "<bound method Class.signature of Class('MissingOperationHandler', 37, 78)>",
+        "docstring": "Raised when an OpenAPI operation cannot be resolved to a handler.\n\nNotes:\n    **Scenarios:**\n\n        - An OpenAPI operation does not define an `operationId`.\n        - An `operationId` is defined but no matching function exists in\n          the provided routes module.\n\n    **Guarantees:**\n\n        - This represents a violation of the OpenAPI-first contract and\n          indicates that the specification and implementation are out of\n          sync."
+      },
+      "Optional": {
+        "name": "Optional",
+        "kind": "alias",
+        "path": "openapi_first.errors.Optional",
+        "signature": "<bound method Alias.signature of Alias('Optional', 'typing.Optional')>",
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.loader.json

@@ -0,0 +1,79 @@
+{
+  "module": "openapi_first.loader",
+  "content": {
+    "path": "openapi_first.loader",
+    "docstring": "# Summary\n\nOpenAPI specification loading and validation utilities.\n\nThis module is responsible for loading an OpenAPI 3.x specification\nfrom disk and validating it before it is used by the application.\n\nIt enforces the principle that an invalid or malformed OpenAPI document\nmust never reach the routing or runtime layers.\n\nNotes:\n    **Design Principles:**\n\n        - OpenAPI is treated as an authoritative contract.\n        - Invalid specifications fail fast at application startup.\n        - Supported formats are JSON and YAML.\n        - Validation errors are surfaced clearly and early.\n\n    **Constraints:**\n\n        - This module intentionally does NOT:\n            - Modify the OpenAPI document.\n            - Infer missing fields.\n            - Generate models or code.\n            - Perform request/response validation at runtime.",
+    "objects": {
+      "json": {
+        "name": "json",
+        "kind": "alias",
+        "path": "openapi_first.loader.json",
+        "signature": "<bound method Alias.signature of Alias('json', 'json')>",
+        "docstring": null
+      },
+      "Path": {
+        "name": "Path",
+        "kind": "alias",
+        "path": "openapi_first.loader.Path",
+        "signature": "<bound method Alias.signature of Alias('Path', 'pathlib.Path')>",
+        "docstring": null
+      },
+      "Any": {
+        "name": "Any",
+        "kind": "alias",
+        "path": "openapi_first.loader.Any",
+        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
+        "docstring": null
+      },
+      "yaml": {
+        "name": "yaml",
+        "kind": "alias",
+        "path": "openapi_first.loader.yaml",
+        "signature": "<bound method Alias.signature of Alias('yaml', 'yaml')>",
+        "docstring": null
+      },
+      "validate_spec": {
+        "name": "validate_spec",
+        "kind": "alias",
+        "path": "openapi_first.loader.validate_spec",
+        "signature": "<bound method Alias.signature of Alias('validate_spec', 'openapi_spec_validator.validate_spec')>",
+        "docstring": null
+      },
+      "OpenAPIFirstError": {
+        "name": "OpenAPIFirstError",
+        "kind": "class",
+        "path": "openapi_first.loader.OpenAPIFirstError",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIFirstError', 'openapi_first.errors.OpenAPIFirstError')>",
+        "docstring": "Base exception for all OpenAPI-first enforcement errors.\n\nNotes:\n    **Responsibilities:**\n\n        - This exception exists to allow callers, test suites, and CI\n          pipelines to catch and distinguish OpenAPI contract violations\n          from unrelated runtime errors.\n        - All exceptions raised by the OpenAPI-first core should inherit\n          from this type."
+      },
+      "OpenAPISpecLoadError": {
+        "name": "OpenAPISpecLoadError",
+        "kind": "class",
+        "path": "openapi_first.loader.OpenAPISpecLoadError",
+        "signature": "<bound method Class.signature of Class('OpenAPISpecLoadError', 39, 49)>",
+        "docstring": "Raised when an OpenAPI specification cannot be loaded or validated.\n\nNotes:\n    **Guarantees:**\n\n        - This error indicates that the OpenAPI document is unreadable,\n          malformed, or violates the OpenAPI 3.x specification."
+      },
+      "load_openapi": {
+        "name": "load_openapi",
+        "kind": "function",
+        "path": "openapi_first.loader.load_openapi",
+        "signature": "<bound method Function.signature of Function('load_openapi', 52, 109)>",
+        "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+      },
+      "Dict": {
+        "name": "Dict",
+        "kind": "alias",
+        "path": "openapi_first.loader.Dict",
+        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+        "docstring": null
+      },
+      "Union": {
+        "name": "Union",
+        "kind": "alias",
+        "path": "openapi_first.loader.Union",
+        "signature": "<bound method Alias.signature of Alias('Union', 'typing.Union')>",
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.crud_app.data.json

@@ -0,0 +1,51 @@
+{
+  "module": "openapi_first.templates.crud_app.data",
+  "content": {
+    "path": "openapi_first.templates.crud_app.data",
+    "docstring": "In-memory mock data store for CRUD example.\n\nThis module intentionally avoids persistence and concurrency guarantees.\nIt is suitable for demos, tests, and scaffolding only.\n\nIt intentionally avoids\n- persistence\n- concurrency guarantees\n- validation\n- error handling\n\nThe implementation is suitable for:\n- demonstrations\n- tests\n- scaffolding and example services\n\nIt is explicitly NOT suitable for production use.\n\nThis module is not part of the ``openapi_first`` library API surface.",
+    "objects": {
+      "Dict": {
+        "name": "Dict",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.data.Dict",
+        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+        "docstring": null
+      },
+      "list_items": {
+        "name": "list_items",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.data.list_items",
+        "signature": "<bound method Function.signature of Function('list_items', 36, 48)>",
+        "docstring": "Return all items in the data store.\n\nThis function performs no filtering, pagination, or sorting.\nThe returned collection reflects the current in-memory state.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+      },
+      "get_item": {
+        "name": "get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.data.get_item",
+        "signature": "<bound method Function.signature of Function('get_item', 51, 68)>",
+        "docstring": "Retrieve a single item by ID.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present in the store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The stored item representation."
+      },
+      "create_item": {
+        "name": "create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.data.create_item",
+        "signature": "<bound method Function.signature of Function('create_item', 71, 92)>",
+        "docstring": "Create a new item in the data store.\n\nA new integer ID is assigned automatically. No validation is\nperformed on the provided payload.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The newly created item, including its assigned ID."
+      },
+      "update_item": {
+        "name": "update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.data.update_item",
+        "signature": "<bound method Function.signature of Function('update_item', 95, 117)>",
+        "docstring": "Replace an existing item in the data store.\n\nThis function overwrites the existing item entirely and does not\nperform partial updates or validation. If the item does not exist,\nit will be created implicitly.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item representation."
+      },
+      "delete_item": {
+        "name": "delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.data.delete_item",
+        "signature": "<bound method Function.signature of Function('delete_item', 120, 132)>",
+        "docstring": "Remove an item from the data store.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.crud_app.json

@@ -0,0 +1,273 @@
+{
+  "module": "openapi_first.templates.crud_app",
+  "content": {
+    "path": "openapi_first.templates.crud_app",
+    "docstring": "OpenAPI-first CRUD application template.\n\nThis package contains a complete, minimal example of an OpenAPI-first\nCRUD service built using the ``openapi_first`` library.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace implementing CRUD operations (``routes``)\n- an in-memory mock data store (``data``)\n\nAll HTTP routes, methods, schemas, and operation bindings are defined\nin the OpenAPI specification and enforced at application startup.\nNo decorator-driven routing or implicit framework behavior is used.\n\nThis template demonstrates:\n- operationId-driven server-side route binding\n- explicit HTTP status code control in handlers\n- operationId-driven client usage against the same OpenAPI contract\n- end-to-end validation using in-memory data and tests\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new CRUD example service using the bundled template:\n\n    openapi-first crud_app\n\nCreate the service in a custom directory:\n\n    openapi-first crud_app my-crud-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client calls for CRUD operations:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    # List items\n    response = client.list_items()\n\n    # Get item by ID\n    response = client.get_item(\n        path_params={\"item_id\": 1}\n    )\n\n    # Create item\n    response = client.create_item(\n        body={\"name\": \"Orange\", \"price\": 0.8}\n    )\n\n    # Update item\n    response = client.update_item(\n        path_params={\"item_id\": 1},\n        body={\"name\": \"Green Apple\", \"price\": 0.6},\n    )\n\n    # Delete item\n    response = client.delete_item(\n        path_params={\"item_id\": 1}\n    )\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Path and request parameters must match the OpenAPI specification\n- Invalid or incomplete OpenAPI specs fail at client construction time\n\n----------------------------------------------------------------------\nNon-Goals\n----------------------------------------------------------------------\n\nThis template is intentionally minimal and is NOT:\n- production-ready\n- persistent or concurrency-safe\n- a reference architecture for data storage\n\nIt exists solely as a copyable example for learning, testing, and\nbootstrapping OpenAPI-first services.\n\nThis package is not part of the ``openapi_first`` library API surface.",
+    "objects": {
+      "data": {
+        "name": "data",
+        "kind": "module",
+        "path": "openapi_first.templates.crud_app.data",
+        "signature": null,
+        "docstring": "In-memory mock data store for CRUD example.\n\nThis module intentionally avoids persistence and concurrency guarantees.\nIt is suitable for demos, tests, and scaffolding only.\n\nIt intentionally avoids\n- persistence\n- concurrency guarantees\n- validation\n- error handling\n\nThe implementation is suitable for:\n- demonstrations\n- tests\n- scaffolding and example services\n\nIt is explicitly NOT suitable for production use.\n\nThis module is not part of the ``openapi_first`` library API surface.",
+        "members": {
+          "Dict": {
+            "name": "Dict",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.data.Dict",
+            "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+            "docstring": null
+          },
+          "list_items": {
+            "name": "list_items",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.data.list_items",
+            "signature": "<bound method Function.signature of Function('list_items', 36, 48)>",
+            "docstring": "Return all items in the data store.\n\nThis function performs no filtering, pagination, or sorting.\nThe returned collection reflects the current in-memory state.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+          },
+          "get_item": {
+            "name": "get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.data.get_item",
+            "signature": "<bound method Function.signature of Function('get_item', 51, 68)>",
+            "docstring": "Retrieve a single item by ID.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present in the store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The stored item representation."
+          },
+          "create_item": {
+            "name": "create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.data.create_item",
+            "signature": "<bound method Function.signature of Function('create_item', 71, 92)>",
+            "docstring": "Create a new item in the data store.\n\nA new integer ID is assigned automatically. No validation is\nperformed on the provided payload.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The newly created item, including its assigned ID."
+          },
+          "update_item": {
+            "name": "update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.data.update_item",
+            "signature": "<bound method Function.signature of Function('update_item', 95, 117)>",
+            "docstring": "Replace an existing item in the data store.\n\nThis function overwrites the existing item entirely and does not\nperform partial updates or validation. If the item does not exist,\nit will be created implicitly.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item representation."
+          },
+          "delete_item": {
+            "name": "delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.data.delete_item",
+            "signature": "<bound method Function.signature of Function('delete_item', 120, 132)>",
+            "docstring": "Remove an item from the data store.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete."
+          }
+        }
+      },
+      "main": {
+        "name": "main",
+        "kind": "module",
+        "path": "openapi_first.templates.crud_app.main",
+        "signature": null,
+        "docstring": "Application entry point for an OpenAPI-first CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+        "members": {
+          "OpenAPIFirstApp": {
+            "name": "OpenAPIFirstApp",
+            "kind": "class",
+            "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp",
+            "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+            "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+            "members": {
+              "openapi": {
+                "name": "openapi",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp.openapi",
+                "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                "docstring": null
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.main.routes",
+            "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+            "docstring": null
+          },
+          "app": {
+            "name": "app",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.main.app",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "module",
+        "path": "openapi_first.templates.crud_app.routes",
+        "signature": null,
+        "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThese handlers explicitly control HTTP status codes to ensure\nruntime behavior matches the OpenAPI contract.\n\nThis module defines OpenAPI-bound operation handlers for a simple CRUD\nservice. Functions in this module are bound to HTTP routes exclusively\nvia OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Error conditions are translated\ninto explicit HTTP responses rather than relying on implicit framework\nbehavior.\n\nNo routing decorators or path definitions appear in this module. All\nrouting, HTTP methods, and schemas are defined in the OpenAPI\nspecification.",
+        "members": {
+          "Response": {
+            "name": "Response",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.routes.Response",
+            "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+            "docstring": null
+          },
+          "HTTPException": {
+            "name": "HTTPException",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.routes.HTTPException",
+            "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+            "docstring": null
+          },
+          "list_items": {
+            "name": "list_items",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.routes.list_items",
+            "signature": "<bound method Function.signature of Function('list_items', 32, 44)>",
+            "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+          },
+          "get_item": {
+            "name": "get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.routes.get_item",
+            "signature": "<bound method Function.signature of Function('get_item', 47, 72)>",
+            "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          },
+          "create_item": {
+            "name": "create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.routes.create_item",
+            "signature": "<bound method Function.signature of Function('create_item', 75, 96)>",
+            "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\ndict\n    The newly created item."
+          },
+          "update_item": {
+            "name": "update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.routes.update_item",
+            "signature": "<bound method Function.signature of Function('update_item', 99, 126)>",
+            "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          },
+          "delete_item": {
+            "name": "delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.routes.delete_item",
+            "signature": "<bound method Function.signature of Function('delete_item', 129, 158)>",
+            "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          }
+        }
+      },
+      "test_crud_app": {
+        "name": "test_crud_app",
+        "kind": "module",
+        "path": "openapi_first.templates.crud_app.test_crud_app",
+        "signature": null,
+        "docstring": "End-to-end tests for the OpenAPI-first CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Correct HTTP status codes and response payloads\n\nThe tests exercise all CRUD operations against an in-memory mock data\nstore and assume deterministic behavior within a single process.\n\nThe tests assume:\n- OpenAPI-first route binding\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process\n- One-to-one correspondence between OpenAPI operationId values and\n  server/client callables",
+        "members": {
+          "TestClient": {
+            "name": "TestClient",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.test_crud_app.TestClient",
+            "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+            "docstring": null
+          },
+          "app": {
+            "name": "app",
+            "kind": "alias",
+            "path": "openapi_first.templates.crud_app.test_crud_app.app",
+            "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+            "docstring": null
+          },
+          "load_openapi": {
+            "name": "load_openapi",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.load_openapi",
+            "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+            "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+          },
+          "OpenAPIClient": {
+            "name": "OpenAPIClient",
+            "kind": "class",
+            "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient",
+            "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+            "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+            "members": {
+              "spec": {
+                "name": "spec",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.spec",
+                "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+                "docstring": null
+              },
+              "base_url": {
+                "name": "base_url",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.base_url",
+                "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+                "docstring": null
+              },
+              "client": {
+                "name": "client",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.client",
+                "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+                "docstring": null
+              },
+              "operations": {
+                "name": "operations",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.operations",
+                "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+                "docstring": null
+              }
+            }
+          },
+          "client": {
+            "name": "client",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.test_crud_app.client",
+            "signature": null,
+            "docstring": null
+          },
+          "spec": {
+            "name": "spec",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.test_crud_app.spec",
+            "signature": null,
+            "docstring": null
+          },
+          "test_list_items_initial": {
+            "name": "test_list_items_initial",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.test_list_items_initial",
+            "signature": "<bound method Function.signature of Function('test_list_items_initial', 38, 49)>",
+            "docstring": "Initial items should be present."
+          },
+          "test_get_item": {
+            "name": "test_get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.test_get_item",
+            "signature": "<bound method Function.signature of Function('test_get_item', 52, 62)>",
+            "docstring": "Existing item should be retrievable by ID."
+          },
+          "test_create_item": {
+            "name": "test_create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.test_create_item",
+            "signature": "<bound method Function.signature of Function('test_create_item', 65, 85)>",
+            "docstring": "Creating a new item should return the created entity."
+          },
+          "test_update_item": {
+            "name": "test_update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.test_update_item",
+            "signature": "<bound method Function.signature of Function('test_update_item', 88, 112)>",
+            "docstring": "Updating an item should replace its values."
+          },
+          "test_delete_item": {
+            "name": "test_delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.test_delete_item",
+            "signature": "<bound method Function.signature of Function('test_delete_item', 115, 125)>",
+            "docstring": "Deleting an item should remove it from the store."
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.crud_app.main.json

@@ -0,0 +1,39 @@
+{
+  "module": "openapi_first.templates.crud_app.main",
+  "content": {
+    "path": "openapi_first.templates.crud_app.main",
+    "docstring": "Application entry point for an OpenAPI-first CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+    "objects": {
+      "OpenAPIFirstApp": {
+        "name": "OpenAPIFirstApp",
+        "kind": "class",
+        "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+        "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+        "members": {
+          "openapi": {
+            "name": "openapi",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp.openapi",
+            "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+            "docstring": null
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.main.routes",
+        "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+        "docstring": null
+      },
+      "app": {
+        "name": "app",
+        "kind": "attribute",
+        "path": "openapi_first.templates.crud_app.main.app",
+        "signature": null,
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.crud_app.routes.json

@@ -0,0 +1,58 @@
+{
+  "module": "openapi_first.templates.crud_app.routes",
+  "content": {
+    "path": "openapi_first.templates.crud_app.routes",
+    "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThese handlers explicitly control HTTP status codes to ensure\nruntime behavior matches the OpenAPI contract.\n\nThis module defines OpenAPI-bound operation handlers for a simple CRUD\nservice. Functions in this module are bound to HTTP routes exclusively\nvia OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Error conditions are translated\ninto explicit HTTP responses rather than relying on implicit framework\nbehavior.\n\nNo routing decorators or path definitions appear in this module. All\nrouting, HTTP methods, and schemas are defined in the OpenAPI\nspecification.",
+    "objects": {
+      "Response": {
+        "name": "Response",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.routes.Response",
+        "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+        "docstring": null
+      },
+      "HTTPException": {
+        "name": "HTTPException",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.routes.HTTPException",
+        "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+        "docstring": null
+      },
+      "list_items": {
+        "name": "list_items",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.routes.list_items",
+        "signature": "<bound method Function.signature of Function('list_items', 32, 44)>",
+        "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+      },
+      "get_item": {
+        "name": "get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.routes.get_item",
+        "signature": "<bound method Function.signature of Function('get_item', 47, 72)>",
+        "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      },
+      "create_item": {
+        "name": "create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.routes.create_item",
+        "signature": "<bound method Function.signature of Function('create_item', 75, 96)>",
+        "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\ndict\n    The newly created item."
+      },
+      "update_item": {
+        "name": "update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.routes.update_item",
+        "signature": "<bound method Function.signature of Function('update_item', 99, 126)>",
+        "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      },
+      "delete_item": {
+        "name": "delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.routes.delete_item",
+        "signature": "<bound method Function.signature of Function('delete_item', 129, 158)>",
+        "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.crud_app.test_crud_app.json

@@ -0,0 +1,116 @@
+{
+  "module": "openapi_first.templates.crud_app.test_crud_app",
+  "content": {
+    "path": "openapi_first.templates.crud_app.test_crud_app",
+    "docstring": "End-to-end tests for the OpenAPI-first CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Correct HTTP status codes and response payloads\n\nThe tests exercise all CRUD operations against an in-memory mock data\nstore and assume deterministic behavior within a single process.\n\nThe tests assume:\n- OpenAPI-first route binding\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process\n- One-to-one correspondence between OpenAPI operationId values and\n  server/client callables",
+    "objects": {
+      "TestClient": {
+        "name": "TestClient",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.test_crud_app.TestClient",
+        "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+        "docstring": null
+      },
+      "app": {
+        "name": "app",
+        "kind": "alias",
+        "path": "openapi_first.templates.crud_app.test_crud_app.app",
+        "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+        "docstring": null
+      },
+      "load_openapi": {
+        "name": "load_openapi",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.load_openapi",
+        "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+        "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+      },
+      "OpenAPIClient": {
+        "name": "OpenAPIClient",
+        "kind": "class",
+        "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+        "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+        "members": {
+          "spec": {
+            "name": "spec",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.spec",
+            "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+            "docstring": null
+          },
+          "base_url": {
+            "name": "base_url",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.base_url",
+            "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+            "docstring": null
+          },
+          "client": {
+            "name": "client",
+            "kind": "attribute",
+            "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.client",
+            "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+            "docstring": null
+          },
+          "operations": {
+            "name": "operations",
+            "kind": "function",
+            "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.operations",
+            "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+            "docstring": null
+          }
+        }
+      },
+      "client": {
+        "name": "client",
+        "kind": "attribute",
+        "path": "openapi_first.templates.crud_app.test_crud_app.client",
+        "signature": null,
+        "docstring": null
+      },
+      "spec": {
+        "name": "spec",
+        "kind": "attribute",
+        "path": "openapi_first.templates.crud_app.test_crud_app.spec",
+        "signature": null,
+        "docstring": null
+      },
+      "test_list_items_initial": {
+        "name": "test_list_items_initial",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.test_list_items_initial",
+        "signature": "<bound method Function.signature of Function('test_list_items_initial', 38, 49)>",
+        "docstring": "Initial items should be present."
+      },
+      "test_get_item": {
+        "name": "test_get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.test_get_item",
+        "signature": "<bound method Function.signature of Function('test_get_item', 52, 62)>",
+        "docstring": "Existing item should be retrievable by ID."
+      },
+      "test_create_item": {
+        "name": "test_create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.test_create_item",
+        "signature": "<bound method Function.signature of Function('test_create_item', 65, 85)>",
+        "docstring": "Creating a new item should return the created entity."
+      },
+      "test_update_item": {
+        "name": "test_update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.test_update_item",
+        "signature": "<bound method Function.signature of Function('test_update_item', 88, 112)>",
+        "docstring": "Updating an item should replace its values."
+      },
+      "test_delete_item": {
+        "name": "test_delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.crud_app.test_crud_app.test_delete_item",
+        "signature": "<bound method Function.signature of Function('test_delete_item', 115, 125)>",
+        "docstring": "Deleting an item should remove it from the store."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.health_app.json

@@ -0,0 +1,64 @@
+{
+  "module": "openapi_first.templates.health_app",
+  "content": {
+    "path": "openapi_first.templates.health_app",
+    "docstring": "OpenAPI-first FastAPI application template.\n\nThis package contains a minimal, fully working example of an\nOpenAPI-first FastAPI service built using the ``openapi_first`` library.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace (``routes``)\n\nNo routing decorators, implicit behavior, or framework-specific\nconvenience abstractions are used. All HTTP routes, methods, and\noperation bindings are defined in OpenAPI and enforced at application\nstartup.\n\nThis package is intended to be copied as a starting point for new\nservices via the ``openapi-first`` CLI. It is not part of the\n``openapi_first`` library API surface.\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new OpenAPI-first health check service using the bundled\ntemplate:\n\n    openapi-first health_app\n\nCreate the service in a custom directory:\n\n    openapi-first health_app my-health-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client call for the ``get_health`` operation:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    response = client.get_health()\n\n    assert response.status_code == 200\n    assert response.json() == {\"status\": \"ok\"}\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Path and request parameters must match the OpenAPI specification\n- Invalid or incomplete OpenAPI specs fail at client construction time",
+    "objects": {
+      "main": {
+        "name": "main",
+        "kind": "module",
+        "path": "openapi_first.templates.health_app.main",
+        "signature": null,
+        "docstring": "Application entry point for an OpenAPI-first FastAPI service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, and operation bindings are defined in the\nOpenAPI document referenced by ``openapi_path``. Python callables\ndefined in the ``routes`` module are bound to OpenAPI operations\nstrictly via ``operationId``.\n\nThis module contains no routing logic, request handling, or framework\nconfiguration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+        "members": {
+          "OpenAPIFirstApp": {
+            "name": "OpenAPIFirstApp",
+            "kind": "class",
+            "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp",
+            "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+            "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+            "members": {
+              "openapi": {
+                "name": "openapi",
+                "kind": "attribute",
+                "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp.openapi",
+                "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                "docstring": null
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "alias",
+            "path": "openapi_first.templates.health_app.main.routes",
+            "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+            "docstring": null
+          },
+          "app": {
+            "name": "app",
+            "kind": "attribute",
+            "path": "openapi_first.templates.health_app.main.app",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "module",
+        "path": "openapi_first.templates.health_app.routes",
+        "signature": null,
+        "docstring": "OpenAPI operation handlers.\n\nThis module defines pure Python callables that implement OpenAPI\noperations for this service. Functions in this module are bound to HTTP\nroutes exclusively via OpenAPI ``operationId`` values.\n\nNo routing decorators, HTTP metadata, or framework-specific logic\nshould appear here. All request/response semantics are defined in the\nOpenAPI specification.\n\nThis module serves solely as an operationId namespace.",
+        "members": {
+          "get_health": {
+            "name": "get_health",
+            "kind": "function",
+            "path": "openapi_first.templates.health_app.routes.get_health",
+            "signature": "<bound method Function.signature of Function('get_health', 16, 32)>",
+            "docstring": "Health check operation handler.\n\nThis function implements the OpenAPI operation identified by\n``operationId: get_health``.\n\nIt contains no routing metadata or framework-specific logic.\nRequest binding, HTTP method, and response semantics are defined\nexclusively by the OpenAPI specification.\n\nReturns\n-------\ndict\n    A minimal liveness payload indicating service health."
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.health_app.main.json

@@ -0,0 +1,39 @@
+{
+  "module": "openapi_first.templates.health_app.main",
+  "content": {
+    "path": "openapi_first.templates.health_app.main",
+    "docstring": "Application entry point for an OpenAPI-first FastAPI service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, and operation bindings are defined in the\nOpenAPI document referenced by ``openapi_path``. Python callables\ndefined in the ``routes`` module are bound to OpenAPI operations\nstrictly via ``operationId``.\n\nThis module contains no routing logic, request handling, or framework\nconfiguration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+    "objects": {
+      "OpenAPIFirstApp": {
+        "name": "OpenAPIFirstApp",
+        "kind": "class",
+        "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+        "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+        "members": {
+          "openapi": {
+            "name": "openapi",
+            "kind": "attribute",
+            "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp.openapi",
+            "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+            "docstring": null
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "alias",
+        "path": "openapi_first.templates.health_app.main.routes",
+        "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+        "docstring": null
+      },
+      "app": {
+        "name": "app",
+        "kind": "attribute",
+        "path": "openapi_first.templates.health_app.main.app",
+        "signature": null,
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.health_app.routes.json

@@ -0,0 +1,16 @@
+{
+  "module": "openapi_first.templates.health_app.routes",
+  "content": {
+    "path": "openapi_first.templates.health_app.routes",
+    "docstring": "OpenAPI operation handlers.\n\nThis module defines pure Python callables that implement OpenAPI\noperations for this service. Functions in this module are bound to HTTP\nroutes exclusively via OpenAPI ``operationId`` values.\n\nNo routing decorators, HTTP metadata, or framework-specific logic\nshould appear here. All request/response semantics are defined in the\nOpenAPI specification.\n\nThis module serves solely as an operationId namespace.",
+    "objects": {
+      "get_health": {
+        "name": "get_health",
+        "kind": "function",
+        "path": "openapi_first.templates.health_app.routes.get_health",
+        "signature": "<bound method Function.signature of Function('get_health', 16, 32)>",
+        "docstring": "Health check operation handler.\n\nThis function implements the OpenAPI operation identified by\n``operationId: get_health``.\n\nIt contains no routing metadata or framework-specific logic.\nRequest binding, HTTP method, and response semantics are defined\nexclusively by the OpenAPI specification.\n\nReturns\n-------\ndict\n    A minimal liveness payload indicating service health."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.json

@@ -0,0 +1,702 @@
+{
+  "module": "openapi_first.templates",
+  "content": {
+    "path": "openapi_first.templates",
+    "docstring": "Application templates for FastAPI OpenAPI First.\n\nThis package contains example and scaffolding templates intended to be\ncopied into user projects via the ``openapi-first`` CLI.\n\nTemplates in this package are:\n- Reference implementations of OpenAPI-first services\n- Not part of the ``openapi_first`` public or internal API\n- Not intended to be imported as runtime dependencies\n\nThe presence of this file exists solely to:\n- Mark the directory as an explicit Python package\n- Enable deterministic tooling behavior (documentation, packaging)\n- Avoid accidental traversal of non-package directories\n\nNo code in this package should be imported by library consumers.",
+    "objects": {
+      "crud_app": {
+        "name": "crud_app",
+        "kind": "module",
+        "path": "openapi_first.templates.crud_app",
+        "signature": null,
+        "docstring": "OpenAPI-first CRUD application template.\n\nThis package contains a complete, minimal example of an OpenAPI-first\nCRUD service built using the ``openapi_first`` library.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace implementing CRUD operations (``routes``)\n- an in-memory mock data store (``data``)\n\nAll HTTP routes, methods, schemas, and operation bindings are defined\nin the OpenAPI specification and enforced at application startup.\nNo decorator-driven routing or implicit framework behavior is used.\n\nThis template demonstrates:\n- operationId-driven server-side route binding\n- explicit HTTP status code control in handlers\n- operationId-driven client usage against the same OpenAPI contract\n- end-to-end validation using in-memory data and tests\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new CRUD example service using the bundled template:\n\n    openapi-first crud_app\n\nCreate the service in a custom directory:\n\n    openapi-first crud_app my-crud-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client calls for CRUD operations:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    # List items\n    response = client.list_items()\n\n    # Get item by ID\n    response = client.get_item(\n        path_params={\"item_id\": 1}\n    )\n\n    # Create item\n    response = client.create_item(\n        body={\"name\": \"Orange\", \"price\": 0.8}\n    )\n\n    # Update item\n    response = client.update_item(\n        path_params={\"item_id\": 1},\n        body={\"name\": \"Green Apple\", \"price\": 0.6},\n    )\n\n    # Delete item\n    response = client.delete_item(\n        path_params={\"item_id\": 1}\n    )\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Path and request parameters must match the OpenAPI specification\n- Invalid or incomplete OpenAPI specs fail at client construction time\n\n----------------------------------------------------------------------\nNon-Goals\n----------------------------------------------------------------------\n\nThis template is intentionally minimal and is NOT:\n- production-ready\n- persistent or concurrency-safe\n- a reference architecture for data storage\n\nIt exists solely as a copyable example for learning, testing, and\nbootstrapping OpenAPI-first services.\n\nThis package is not part of the ``openapi_first`` library API surface.",
+        "members": {
+          "data": {
+            "name": "data",
+            "kind": "module",
+            "path": "openapi_first.templates.crud_app.data",
+            "signature": null,
+            "docstring": "In-memory mock data store for CRUD example.\n\nThis module intentionally avoids persistence and concurrency guarantees.\nIt is suitable for demos, tests, and scaffolding only.\n\nIt intentionally avoids\n- persistence\n- concurrency guarantees\n- validation\n- error handling\n\nThe implementation is suitable for:\n- demonstrations\n- tests\n- scaffolding and example services\n\nIt is explicitly NOT suitable for production use.\n\nThis module is not part of the ``openapi_first`` library API surface.",
+            "members": {
+              "Dict": {
+                "name": "Dict",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.data.Dict",
+                "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+                "docstring": null
+              },
+              "list_items": {
+                "name": "list_items",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.data.list_items",
+                "signature": "<bound method Function.signature of Function('list_items', 36, 48)>",
+                "docstring": "Return all items in the data store.\n\nThis function performs no filtering, pagination, or sorting.\nThe returned collection reflects the current in-memory state.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+              },
+              "get_item": {
+                "name": "get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.data.get_item",
+                "signature": "<bound method Function.signature of Function('get_item', 51, 68)>",
+                "docstring": "Retrieve a single item by ID.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present in the store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The stored item representation."
+              },
+              "create_item": {
+                "name": "create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.data.create_item",
+                "signature": "<bound method Function.signature of Function('create_item', 71, 92)>",
+                "docstring": "Create a new item in the data store.\n\nA new integer ID is assigned automatically. No validation is\nperformed on the provided payload.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The newly created item, including its assigned ID."
+              },
+              "update_item": {
+                "name": "update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.data.update_item",
+                "signature": "<bound method Function.signature of Function('update_item', 95, 117)>",
+                "docstring": "Replace an existing item in the data store.\n\nThis function overwrites the existing item entirely and does not\nperform partial updates or validation. If the item does not exist,\nit will be created implicitly.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item representation."
+              },
+              "delete_item": {
+                "name": "delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.data.delete_item",
+                "signature": "<bound method Function.signature of Function('delete_item', 120, 132)>",
+                "docstring": "Remove an item from the data store.\n\nThis function assumes the item exists and will raise ``KeyError``\nif the ID is not present.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete."
+              }
+            }
+          },
+          "main": {
+            "name": "main",
+            "kind": "module",
+            "path": "openapi_first.templates.crud_app.main",
+            "signature": null,
+            "docstring": "Application entry point for an OpenAPI-first CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+            "members": {
+              "OpenAPIFirstApp": {
+                "name": "OpenAPIFirstApp",
+                "kind": "class",
+                "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp",
+                "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+                "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+                "members": {
+                  "openapi": {
+                    "name": "openapi",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.crud_app.main.OpenAPIFirstApp.openapi",
+                    "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                    "docstring": null
+                  }
+                }
+              },
+              "routes": {
+                "name": "routes",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.main.routes",
+                "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+                "docstring": null
+              },
+              "app": {
+                "name": "app",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.main.app",
+                "signature": null,
+                "docstring": null
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "module",
+            "path": "openapi_first.templates.crud_app.routes",
+            "signature": null,
+            "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThese handlers explicitly control HTTP status codes to ensure\nruntime behavior matches the OpenAPI contract.\n\nThis module defines OpenAPI-bound operation handlers for a simple CRUD\nservice. Functions in this module are bound to HTTP routes exclusively\nvia OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Error conditions are translated\ninto explicit HTTP responses rather than relying on implicit framework\nbehavior.\n\nNo routing decorators or path definitions appear in this module. All\nrouting, HTTP methods, and schemas are defined in the OpenAPI\nspecification.",
+            "members": {
+              "Response": {
+                "name": "Response",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.routes.Response",
+                "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+                "docstring": null
+              },
+              "HTTPException": {
+                "name": "HTTPException",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.routes.HTTPException",
+                "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+                "docstring": null
+              },
+              "list_items": {
+                "name": "list_items",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.routes.list_items",
+                "signature": "<bound method Function.signature of Function('list_items', 32, 44)>",
+                "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[dict]\n    A list of item representations."
+              },
+              "get_item": {
+                "name": "get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.routes.get_item",
+                "signature": "<bound method Function.signature of Function('get_item', 47, 72)>",
+                "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\ndict\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              },
+              "create_item": {
+                "name": "create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.routes.create_item",
+                "signature": "<bound method Function.signature of Function('create_item', 75, 96)>",
+                "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : dict\n    Item attributes excluding the ``id`` field.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\ndict\n    The newly created item."
+              },
+              "update_item": {
+                "name": "update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.routes.update_item",
+                "signature": "<bound method Function.signature of Function('update_item', 99, 126)>",
+                "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : dict\n    Item attributes excluding the ``id`` field.\n\nReturns\n-------\ndict\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              },
+              "delete_item": {
+                "name": "delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.routes.delete_item",
+                "signature": "<bound method Function.signature of Function('delete_item', 129, 158)>",
+                "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              }
+            }
+          },
+          "test_crud_app": {
+            "name": "test_crud_app",
+            "kind": "module",
+            "path": "openapi_first.templates.crud_app.test_crud_app",
+            "signature": null,
+            "docstring": "End-to-end tests for the OpenAPI-first CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Correct HTTP status codes and response payloads\n\nThe tests exercise all CRUD operations against an in-memory mock data\nstore and assume deterministic behavior within a single process.\n\nThe tests assume:\n- OpenAPI-first route binding\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process\n- One-to-one correspondence between OpenAPI operationId values and\n  server/client callables",
+            "members": {
+              "TestClient": {
+                "name": "TestClient",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.test_crud_app.TestClient",
+                "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+                "docstring": null
+              },
+              "app": {
+                "name": "app",
+                "kind": "alias",
+                "path": "openapi_first.templates.crud_app.test_crud_app.app",
+                "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+                "docstring": null
+              },
+              "load_openapi": {
+                "name": "load_openapi",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.load_openapi",
+                "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+                "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+              },
+              "OpenAPIClient": {
+                "name": "OpenAPIClient",
+                "kind": "class",
+                "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient",
+                "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+                "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+                "members": {
+                  "spec": {
+                    "name": "spec",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.spec",
+                    "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+                    "docstring": null
+                  },
+                  "base_url": {
+                    "name": "base_url",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.base_url",
+                    "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+                    "docstring": null
+                  },
+                  "client": {
+                    "name": "client",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.client",
+                    "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+                    "docstring": null
+                  },
+                  "operations": {
+                    "name": "operations",
+                    "kind": "function",
+                    "path": "openapi_first.templates.crud_app.test_crud_app.OpenAPIClient.operations",
+                    "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+                    "docstring": null
+                  }
+                }
+              },
+              "client": {
+                "name": "client",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.test_crud_app.client",
+                "signature": null,
+                "docstring": null
+              },
+              "spec": {
+                "name": "spec",
+                "kind": "attribute",
+                "path": "openapi_first.templates.crud_app.test_crud_app.spec",
+                "signature": null,
+                "docstring": null
+              },
+              "test_list_items_initial": {
+                "name": "test_list_items_initial",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.test_list_items_initial",
+                "signature": "<bound method Function.signature of Function('test_list_items_initial', 38, 49)>",
+                "docstring": "Initial items should be present."
+              },
+              "test_get_item": {
+                "name": "test_get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.test_get_item",
+                "signature": "<bound method Function.signature of Function('test_get_item', 52, 62)>",
+                "docstring": "Existing item should be retrievable by ID."
+              },
+              "test_create_item": {
+                "name": "test_create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.test_create_item",
+                "signature": "<bound method Function.signature of Function('test_create_item', 65, 85)>",
+                "docstring": "Creating a new item should return the created entity."
+              },
+              "test_update_item": {
+                "name": "test_update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.test_update_item",
+                "signature": "<bound method Function.signature of Function('test_update_item', 88, 112)>",
+                "docstring": "Updating an item should replace its values."
+              },
+              "test_delete_item": {
+                "name": "test_delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.crud_app.test_crud_app.test_delete_item",
+                "signature": "<bound method Function.signature of Function('test_delete_item', 115, 125)>",
+                "docstring": "Deleting an item should remove it from the store."
+              }
+            }
+          }
+        }
+      },
+      "health_app": {
+        "name": "health_app",
+        "kind": "module",
+        "path": "openapi_first.templates.health_app",
+        "signature": null,
+        "docstring": "OpenAPI-first FastAPI application template.\n\nThis package contains a minimal, fully working example of an\nOpenAPI-first FastAPI service built using the ``openapi_first`` library.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace (``routes``)\n\nNo routing decorators, implicit behavior, or framework-specific\nconvenience abstractions are used. All HTTP routes, methods, and\noperation bindings are defined in OpenAPI and enforced at application\nstartup.\n\nThis package is intended to be copied as a starting point for new\nservices via the ``openapi-first`` CLI. It is not part of the\n``openapi_first`` library API surface.\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new OpenAPI-first health check service using the bundled\ntemplate:\n\n    openapi-first health_app\n\nCreate the service in a custom directory:\n\n    openapi-first health_app my-health-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client call for the ``get_health`` operation:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    response = client.get_health()\n\n    assert response.status_code == 200\n    assert response.json() == {\"status\": \"ok\"}\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Path and request parameters must match the OpenAPI specification\n- Invalid or incomplete OpenAPI specs fail at client construction time",
+        "members": {
+          "main": {
+            "name": "main",
+            "kind": "module",
+            "path": "openapi_first.templates.health_app.main",
+            "signature": null,
+            "docstring": "Application entry point for an OpenAPI-first FastAPI service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, and operation bindings are defined in the\nOpenAPI document referenced by ``openapi_path``. Python callables\ndefined in the ``routes`` module are bound to OpenAPI operations\nstrictly via ``operationId``.\n\nThis module contains no routing logic, request handling, or framework\nconfiguration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+            "members": {
+              "OpenAPIFirstApp": {
+                "name": "OpenAPIFirstApp",
+                "kind": "class",
+                "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp",
+                "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+                "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+                "members": {
+                  "openapi": {
+                    "name": "openapi",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.health_app.main.OpenAPIFirstApp.openapi",
+                    "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                    "docstring": null
+                  }
+                }
+              },
+              "routes": {
+                "name": "routes",
+                "kind": "alias",
+                "path": "openapi_first.templates.health_app.main.routes",
+                "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+                "docstring": null
+              },
+              "app": {
+                "name": "app",
+                "kind": "attribute",
+                "path": "openapi_first.templates.health_app.main.app",
+                "signature": null,
+                "docstring": null
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "module",
+            "path": "openapi_first.templates.health_app.routes",
+            "signature": null,
+            "docstring": "OpenAPI operation handlers.\n\nThis module defines pure Python callables that implement OpenAPI\noperations for this service. Functions in this module are bound to HTTP\nroutes exclusively via OpenAPI ``operationId`` values.\n\nNo routing decorators, HTTP metadata, or framework-specific logic\nshould appear here. All request/response semantics are defined in the\nOpenAPI specification.\n\nThis module serves solely as an operationId namespace.",
+            "members": {
+              "get_health": {
+                "name": "get_health",
+                "kind": "function",
+                "path": "openapi_first.templates.health_app.routes.get_health",
+                "signature": "<bound method Function.signature of Function('get_health', 16, 32)>",
+                "docstring": "Health check operation handler.\n\nThis function implements the OpenAPI operation identified by\n``operationId: get_health``.\n\nIt contains no routing metadata or framework-specific logic.\nRequest binding, HTTP method, and response semantics are defined\nexclusively by the OpenAPI specification.\n\nReturns\n-------\ndict\n    A minimal liveness payload indicating service health."
+              }
+            }
+          }
+        }
+      },
+      "model_app": {
+        "name": "model_app",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app",
+        "signature": null,
+        "docstring": "OpenAPI-first model-based CRUD application template.\n\nThis package contains a complete, minimal example of an OpenAPI-first\nCRUD service that uses explicit Pydantic domain models for request and\nresponse schemas.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace implementing CRUD operations (``routes``)\n- Pydantic domain models (``models``)\n- an in-memory mock data store (``data``)\n\nAll HTTP routes, methods, schemas, and operation bindings are defined\nin the OpenAPI specification and enforced at application startup.\nNo decorator-driven routing or implicit framework behavior is used.\n\nThis template demonstrates:\n- operationId-driven server-side route binding\n- explicit request and response modeling with Pydantic\n- explicit HTTP status code control in handlers\n- operationId-driven client usage against the same OpenAPI contract\n- end-to-end validation using in-memory data and tests\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new model-based CRUD example service using the bundled template:\n\n    openapi-first model_app\n\nCreate the service in a custom directory:\n\n    openapi-first model_app my-model-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client calls for model-based CRUD operations:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    # List items\n    response = client.list_items()\n\n    # Get item by ID\n    response = client.get_item(\n        path_params={\"item_id\": 1}\n    )\n\n    # Create item\n    response = client.create_item(\n        body={\"name\": \"Orange\", \"price\": 0.8}\n    )\n\n    # Update item\n    response = client.update_item(\n        path_params={\"item_id\": 1},\n        body={\"name\": \"Green Apple\", \"price\": 0.6},\n    )\n\n    # Delete item\n    response = client.delete_item(\n        path_params={\"item_id\": 1}\n    )\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Request and response payloads conform to Pydantic models\n- Invalid or incomplete OpenAPI specs fail at client construction time\n\n----------------------------------------------------------------------\nNon-Goals\n----------------------------------------------------------------------\n\nThis template is intentionally minimal and is NOT:\n- production-ready\n- persistent or concurrency-safe\n- a reference architecture for data storage\n\nIt exists solely as a copyable example for learning, testing, and\nbootstrapping OpenAPI-first services.\n\nThis package is not part of the ``openapi_first`` library API surface.",
+        "members": {
+          "data": {
+            "name": "data",
+            "kind": "module",
+            "path": "openapi_first.templates.model_app.data",
+            "signature": null,
+            "docstring": "In-memory data store using Pydantic models.\n\nThis module is NOT thread-safe and is intended for demos and scaffolds only.\nThis module provides a minimal, process-local data store for the\nmodel-based CRUD example application. It stores and returns domain\nobjects defined using Pydantic models and is intended solely for\ndemonstration and scaffolding purposes.\n\nThe implementation intentionally avoids:\n- persistence\n- concurrency guarantees\n- transactional semantics\n- validation beyond what Pydantic provides\n\nIt is not part of the ``openapi_first`` library API surface.",
+            "members": {
+              "Dict": {
+                "name": "Dict",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.data.Dict",
+                "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+                "docstring": null
+              },
+              "Item": {
+                "name": "Item",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.data.Item",
+                "signature": "<bound method Alias.signature of Alias('Item', 'models.Item')>",
+                "docstring": null
+              },
+              "ItemCreate": {
+                "name": "ItemCreate",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.data.ItemCreate",
+                "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+                "docstring": null
+              },
+              "list_items": {
+                "name": "list_items",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.data.list_items",
+                "signature": "<bound method Function.signature of Function('list_items', 34, 43)>",
+                "docstring": "Return all items in the data store.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+              },
+              "get_item": {
+                "name": "get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.data.get_item",
+                "signature": "<bound method Function.signature of Function('get_item', 46, 65)>",
+                "docstring": "Retrieve a single item by ID.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+              },
+              "create_item": {
+                "name": "create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.data.create_item",
+                "signature": "<bound method Function.signature of Function('create_item', 68, 89)>",
+                "docstring": "Create a new item in the data store.\n\nA new identifier is assigned automatically. No additional validation\nis performed beyond Pydantic model validation.\n\nParameters\n----------\npayload : ItemCreate\n    Data required to create a new item.\n\nReturns\n-------\nItem\n    The newly created item."
+              },
+              "update_item": {
+                "name": "update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.data.update_item",
+                "signature": "<bound method Function.signature of Function('update_item', 92, 120)>",
+                "docstring": "Replace an existing item in the data store.\n\nThis function performs a full replacement of the stored item.\nPartial updates are not supported.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+              },
+              "delete_item": {
+                "name": "delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.data.delete_item",
+                "signature": "<bound method Function.signature of Function('delete_item', 123, 137)>",
+                "docstring": "Remove an item from the data store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+              }
+            }
+          },
+          "main": {
+            "name": "main",
+            "kind": "module",
+            "path": "openapi_first.templates.model_app.main",
+            "signature": null,
+            "docstring": "Application entry point for an OpenAPI-first model-based CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+            "members": {
+              "OpenAPIFirstApp": {
+                "name": "OpenAPIFirstApp",
+                "kind": "class",
+                "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp",
+                "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+                "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+                "members": {
+                  "openapi": {
+                    "name": "openapi",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp.openapi",
+                    "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                    "docstring": null
+                  }
+                }
+              },
+              "routes": {
+                "name": "routes",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.main.routes",
+                "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+                "docstring": null
+              },
+              "app": {
+                "name": "app",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.main.app",
+                "signature": null,
+                "docstring": null
+              }
+            }
+          },
+          "models": {
+            "name": "models",
+            "kind": "module",
+            "path": "openapi_first.templates.model_app.models",
+            "signature": null,
+            "docstring": "Pydantic domain models for the CRUD example.\n\nThis module defines Pydantic models that represent the domain entities\nused by the service. These models are referenced by the OpenAPI\nspecification for request and response schemas.\n\nThe models are declarative and framework-agnostic. They contain no\npersistence logic, validation beyond type constraints, or business\nbehavior.\n\nThis module is not part of the ``openapi_first`` library API surface.\nIt exists solely to support the example application template.",
+            "members": {
+              "BaseModel": {
+                "name": "BaseModel",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.models.BaseModel",
+                "signature": "<bound method Alias.signature of Alias('BaseModel', 'pydantic.BaseModel')>",
+                "docstring": null
+              },
+              "ItemBase": {
+                "name": "ItemBase",
+                "kind": "class",
+                "path": "openapi_first.templates.model_app.models.ItemBase",
+                "signature": "<bound method Class.signature of Class('ItemBase', 19, 27)>",
+                "docstring": "Base domain model for an item.\n\nDefines fields common to all item representations.",
+                "members": {
+                  "name": {
+                    "name": "name",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.models.ItemBase.name",
+                    "signature": null,
+                    "docstring": null
+                  },
+                  "price": {
+                    "name": "price",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.models.ItemBase.price",
+                    "signature": null,
+                    "docstring": null
+                  }
+                }
+              },
+              "ItemCreate": {
+                "name": "ItemCreate",
+                "kind": "class",
+                "path": "openapi_first.templates.model_app.models.ItemCreate",
+                "signature": "<bound method Class.signature of Class('ItemCreate', 30, 39)>",
+                "docstring": "Domain model for item creation requests.\n\nThis model is used for request bodies when creating new items.\nIt intentionally excludes the ``id`` field, which is assigned\nby the service."
+              },
+              "Item": {
+                "name": "Item",
+                "kind": "class",
+                "path": "openapi_first.templates.model_app.models.Item",
+                "signature": "<bound method Class.signature of Class('Item', 42, 50)>",
+                "docstring": "Domain model for a persisted item.\n\nThis model represents the full item state returned in responses,\nincluding the server-assigned identifier.",
+                "members": {
+                  "id": {
+                    "name": "id",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.models.Item.id",
+                    "signature": null,
+                    "docstring": null
+                  }
+                }
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "module",
+            "path": "openapi_first.templates.model_app.routes",
+            "signature": null,
+            "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThis module defines OpenAPI-bound operation handlers for a model-based\nCRUD service. Functions in this module are bound to HTTP routes\nexclusively via OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Domain models defined using\nPydantic are used for request and response payloads.\n\nNo routing decorators, path definitions, or implicit framework behavior\nappear in this module. All routing, HTTP methods, and schemas are defined\nin the OpenAPI specification.",
+            "members": {
+              "Response": {
+                "name": "Response",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.routes.Response",
+                "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+                "docstring": null
+              },
+              "HTTPException": {
+                "name": "HTTPException",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.routes.HTTPException",
+                "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+                "docstring": null
+              },
+              "ItemCreate": {
+                "name": "ItemCreate",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.routes.ItemCreate",
+                "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+                "docstring": null
+              },
+              "list_items": {
+                "name": "list_items",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.routes.list_items",
+                "signature": "<bound method Function.signature of Function('list_items', 29, 41)>",
+                "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+              },
+              "get_item": {
+                "name": "get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.routes.get_item",
+                "signature": "<bound method Function.signature of Function('get_item', 44, 69)>",
+                "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              },
+              "create_item": {
+                "name": "create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.routes.create_item",
+                "signature": "<bound method Function.signature of Function('create_item', 72, 93)>",
+                "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : ItemCreate\n    Request body describing the item to create.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nItem\n    The newly created item."
+              },
+              "update_item": {
+                "name": "update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.routes.update_item",
+                "signature": "<bound method Function.signature of Function('update_item', 96, 123)>",
+                "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              },
+              "delete_item": {
+                "name": "delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.routes.delete_item",
+                "signature": "<bound method Function.signature of Function('delete_item', 126, 156)>",
+                "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+              }
+            }
+          },
+          "test_model_app": {
+            "name": "test_model_app",
+            "kind": "module",
+            "path": "openapi_first.templates.model_app.test_model_app",
+            "signature": null,
+            "docstring": "End-to-end tests for the OpenAPI-first model CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store using Pydantic models.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Pydantic model-based request and response handling\n\nAll CRUD operations are exercised against an in-memory mock data store\nbacked by Pydantic domain models.\n\nThe tests assume:\n- OpenAPI-first route binding\n- Pydantic model validation\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process",
+            "members": {
+              "TestClient": {
+                "name": "TestClient",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.test_model_app.TestClient",
+                "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+                "docstring": null
+              },
+              "app": {
+                "name": "app",
+                "kind": "alias",
+                "path": "openapi_first.templates.model_app.test_model_app.app",
+                "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+                "docstring": null
+              },
+              "load_openapi": {
+                "name": "load_openapi",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.load_openapi",
+                "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+                "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+              },
+              "OpenAPIClient": {
+                "name": "OpenAPIClient",
+                "kind": "class",
+                "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient",
+                "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+                "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+                "members": {
+                  "spec": {
+                    "name": "spec",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.spec",
+                    "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+                    "docstring": null
+                  },
+                  "base_url": {
+                    "name": "base_url",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.base_url",
+                    "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+                    "docstring": null
+                  },
+                  "client": {
+                    "name": "client",
+                    "kind": "attribute",
+                    "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.client",
+                    "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+                    "docstring": null
+                  },
+                  "operations": {
+                    "name": "operations",
+                    "kind": "function",
+                    "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.operations",
+                    "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+                    "docstring": null
+                  }
+                }
+              },
+              "client": {
+                "name": "client",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.test_model_app.client",
+                "signature": null,
+                "docstring": null
+              },
+              "spec": {
+                "name": "spec",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.test_model_app.spec",
+                "signature": null,
+                "docstring": null
+              },
+              "test_list_items_initial": {
+                "name": "test_list_items_initial",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.test_list_items_initial",
+                "signature": "<bound method Function.signature of Function('test_list_items_initial', 37, 48)>",
+                "docstring": "Initial items should be present."
+              },
+              "test_get_item": {
+                "name": "test_get_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.test_get_item",
+                "signature": "<bound method Function.signature of Function('test_get_item', 51, 61)>",
+                "docstring": "Existing item should be retrievable by ID."
+              },
+              "test_create_item": {
+                "name": "test_create_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.test_create_item",
+                "signature": "<bound method Function.signature of Function('test_create_item', 64, 84)>",
+                "docstring": "Creating a new item should return the created entity."
+              },
+              "test_update_item": {
+                "name": "test_update_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.test_update_item",
+                "signature": "<bound method Function.signature of Function('test_update_item', 87, 111)>",
+                "docstring": "Updating an item should replace its values."
+              },
+              "test_delete_item": {
+                "name": "test_delete_item",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.test_delete_item",
+                "signature": "<bound method Function.signature of Function('test_delete_item', 114, 124)>",
+                "docstring": "Deleting an item should remove it from the store."
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.data.json

@@ -0,0 +1,65 @@
+{
+  "module": "openapi_first.templates.model_app.data",
+  "content": {
+    "path": "openapi_first.templates.model_app.data",
+    "docstring": "In-memory data store using Pydantic models.\n\nThis module is NOT thread-safe and is intended for demos and scaffolds only.\nThis module provides a minimal, process-local data store for the\nmodel-based CRUD example application. It stores and returns domain\nobjects defined using Pydantic models and is intended solely for\ndemonstration and scaffolding purposes.\n\nThe implementation intentionally avoids:\n- persistence\n- concurrency guarantees\n- transactional semantics\n- validation beyond what Pydantic provides\n\nIt is not part of the ``openapi_first`` library API surface.",
+    "objects": {
+      "Dict": {
+        "name": "Dict",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.data.Dict",
+        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+        "docstring": null
+      },
+      "Item": {
+        "name": "Item",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.data.Item",
+        "signature": "<bound method Alias.signature of Alias('Item', 'models.Item')>",
+        "docstring": null
+      },
+      "ItemCreate": {
+        "name": "ItemCreate",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.data.ItemCreate",
+        "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+        "docstring": null
+      },
+      "list_items": {
+        "name": "list_items",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.data.list_items",
+        "signature": "<bound method Function.signature of Function('list_items', 34, 43)>",
+        "docstring": "Return all items in the data store.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+      },
+      "get_item": {
+        "name": "get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.data.get_item",
+        "signature": "<bound method Function.signature of Function('get_item', 46, 65)>",
+        "docstring": "Retrieve a single item by ID.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+      },
+      "create_item": {
+        "name": "create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.data.create_item",
+        "signature": "<bound method Function.signature of Function('create_item', 68, 89)>",
+        "docstring": "Create a new item in the data store.\n\nA new identifier is assigned automatically. No additional validation\nis performed beyond Pydantic model validation.\n\nParameters\n----------\npayload : ItemCreate\n    Data required to create a new item.\n\nReturns\n-------\nItem\n    The newly created item."
+      },
+      "update_item": {
+        "name": "update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.data.update_item",
+        "signature": "<bound method Function.signature of Function('update_item', 92, 120)>",
+        "docstring": "Replace an existing item in the data store.\n\nThis function performs a full replacement of the stored item.\nPartial updates are not supported.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+      },
+      "delete_item": {
+        "name": "delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.data.delete_item",
+        "signature": "<bound method Function.signature of Function('delete_item', 123, 137)>",
+        "docstring": "Remove an item from the data store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.json

@@ -0,0 +1,356 @@
+{
+  "module": "openapi_first.templates.model_app",
+  "content": {
+    "path": "openapi_first.templates.model_app",
+    "docstring": "OpenAPI-first model-based CRUD application template.\n\nThis package contains a complete, minimal example of an OpenAPI-first\nCRUD service that uses explicit Pydantic domain models for request and\nresponse schemas.\n\nThe application is assembled exclusively from:\n- an OpenAPI specification (``openapi.yaml``)\n- a handler namespace implementing CRUD operations (``routes``)\n- Pydantic domain models (``models``)\n- an in-memory mock data store (``data``)\n\nAll HTTP routes, methods, schemas, and operation bindings are defined\nin the OpenAPI specification and enforced at application startup.\nNo decorator-driven routing or implicit framework behavior is used.\n\nThis template demonstrates:\n- operationId-driven server-side route binding\n- explicit request and response modeling with Pydantic\n- explicit HTTP status code control in handlers\n- operationId-driven client usage against the same OpenAPI contract\n- end-to-end validation using in-memory data and tests\n\n----------------------------------------------------------------------\nScaffolding via CLI\n----------------------------------------------------------------------\n\nCreate a new model-based CRUD example service using the bundled template:\n\n    openapi-first model_app\n\nCreate the service in a custom directory:\n\n    openapi-first model_app my-model-service\n\nList all available application templates:\n\n    openapi-first --list\n\nThe CLI copies template files verbatim into the target directory.\nNo code is generated or modified beyond the copied scaffold.\n\n----------------------------------------------------------------------\nClient Usage Example\n----------------------------------------------------------------------\n\nThe same OpenAPI specification used by the server can be used to\nconstruct a strict, operationId-driven HTTP client.\n\nExample client calls for model-based CRUD operations:\n\n    from openapi_first.loader import load_openapi\n    from openapi_first.client import OpenAPIClient\n\n    spec = load_openapi(\"openapi.yaml\")\n    client = OpenAPIClient(spec)\n\n    # List items\n    response = client.list_items()\n\n    # Get item by ID\n    response = client.get_item(\n        path_params={\"item_id\": 1}\n    )\n\n    # Create item\n    response = client.create_item(\n        body={\"name\": \"Orange\", \"price\": 0.8}\n    )\n\n    # Update item\n    response = client.update_item(\n        path_params={\"item_id\": 1},\n        body={\"name\": \"Green Apple\", \"price\": 0.6},\n    )\n\n    # Delete item\n    response = client.delete_item(\n        path_params={\"item_id\": 1}\n    )\n\nClient guarantees:\n- One callable per OpenAPI ``operationId``\n- No hardcoded URLs or HTTP methods in user code\n- Request and response payloads conform to Pydantic models\n- Invalid or incomplete OpenAPI specs fail at client construction time\n\n----------------------------------------------------------------------\nNon-Goals\n----------------------------------------------------------------------\n\nThis template is intentionally minimal and is NOT:\n- production-ready\n- persistent or concurrency-safe\n- a reference architecture for data storage\n\nIt exists solely as a copyable example for learning, testing, and\nbootstrapping OpenAPI-first services.\n\nThis package is not part of the ``openapi_first`` library API surface.",
+    "objects": {
+      "data": {
+        "name": "data",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app.data",
+        "signature": null,
+        "docstring": "In-memory data store using Pydantic models.\n\nThis module is NOT thread-safe and is intended for demos and scaffolds only.\nThis module provides a minimal, process-local data store for the\nmodel-based CRUD example application. It stores and returns domain\nobjects defined using Pydantic models and is intended solely for\ndemonstration and scaffolding purposes.\n\nThe implementation intentionally avoids:\n- persistence\n- concurrency guarantees\n- transactional semantics\n- validation beyond what Pydantic provides\n\nIt is not part of the ``openapi_first`` library API surface.",
+        "members": {
+          "Dict": {
+            "name": "Dict",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.data.Dict",
+            "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
+            "docstring": null
+          },
+          "Item": {
+            "name": "Item",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.data.Item",
+            "signature": "<bound method Alias.signature of Alias('Item', 'models.Item')>",
+            "docstring": null
+          },
+          "ItemCreate": {
+            "name": "ItemCreate",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.data.ItemCreate",
+            "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+            "docstring": null
+          },
+          "list_items": {
+            "name": "list_items",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.data.list_items",
+            "signature": "<bound method Function.signature of Function('list_items', 34, 43)>",
+            "docstring": "Return all items in the data store.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+          },
+          "get_item": {
+            "name": "get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.data.get_item",
+            "signature": "<bound method Function.signature of Function('get_item', 46, 65)>",
+            "docstring": "Retrieve a single item by ID.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+          },
+          "create_item": {
+            "name": "create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.data.create_item",
+            "signature": "<bound method Function.signature of Function('create_item', 68, 89)>",
+            "docstring": "Create a new item in the data store.\n\nA new identifier is assigned automatically. No additional validation\nis performed beyond Pydantic model validation.\n\nParameters\n----------\npayload : ItemCreate\n    Data required to create a new item.\n\nReturns\n-------\nItem\n    The newly created item."
+          },
+          "update_item": {
+            "name": "update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.data.update_item",
+            "signature": "<bound method Function.signature of Function('update_item', 92, 120)>",
+            "docstring": "Replace an existing item in the data store.\n\nThis function performs a full replacement of the stored item.\nPartial updates are not supported.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+          },
+          "delete_item": {
+            "name": "delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.data.delete_item",
+            "signature": "<bound method Function.signature of Function('delete_item', 123, 137)>",
+            "docstring": "Remove an item from the data store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\n\nRaises\n------\nKeyError\n    If the item does not exist."
+          }
+        }
+      },
+      "main": {
+        "name": "main",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app.main",
+        "signature": null,
+        "docstring": "Application entry point for an OpenAPI-first model-based CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+        "members": {
+          "OpenAPIFirstApp": {
+            "name": "OpenAPIFirstApp",
+            "kind": "class",
+            "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp",
+            "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+            "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+            "members": {
+              "openapi": {
+                "name": "openapi",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp.openapi",
+                "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+                "docstring": null
+              }
+            }
+          },
+          "routes": {
+            "name": "routes",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.main.routes",
+            "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+            "docstring": null
+          },
+          "app": {
+            "name": "app",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.main.app",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      },
+      "models": {
+        "name": "models",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app.models",
+        "signature": null,
+        "docstring": "Pydantic domain models for the CRUD example.\n\nThis module defines Pydantic models that represent the domain entities\nused by the service. These models are referenced by the OpenAPI\nspecification for request and response schemas.\n\nThe models are declarative and framework-agnostic. They contain no\npersistence logic, validation beyond type constraints, or business\nbehavior.\n\nThis module is not part of the ``openapi_first`` library API surface.\nIt exists solely to support the example application template.",
+        "members": {
+          "BaseModel": {
+            "name": "BaseModel",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.models.BaseModel",
+            "signature": "<bound method Alias.signature of Alias('BaseModel', 'pydantic.BaseModel')>",
+            "docstring": null
+          },
+          "ItemBase": {
+            "name": "ItemBase",
+            "kind": "class",
+            "path": "openapi_first.templates.model_app.models.ItemBase",
+            "signature": "<bound method Class.signature of Class('ItemBase', 19, 27)>",
+            "docstring": "Base domain model for an item.\n\nDefines fields common to all item representations.",
+            "members": {
+              "name": {
+                "name": "name",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.models.ItemBase.name",
+                "signature": null,
+                "docstring": null
+              },
+              "price": {
+                "name": "price",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.models.ItemBase.price",
+                "signature": null,
+                "docstring": null
+              }
+            }
+          },
+          "ItemCreate": {
+            "name": "ItemCreate",
+            "kind": "class",
+            "path": "openapi_first.templates.model_app.models.ItemCreate",
+            "signature": "<bound method Class.signature of Class('ItemCreate', 30, 39)>",
+            "docstring": "Domain model for item creation requests.\n\nThis model is used for request bodies when creating new items.\nIt intentionally excludes the ``id`` field, which is assigned\nby the service."
+          },
+          "Item": {
+            "name": "Item",
+            "kind": "class",
+            "path": "openapi_first.templates.model_app.models.Item",
+            "signature": "<bound method Class.signature of Class('Item', 42, 50)>",
+            "docstring": "Domain model for a persisted item.\n\nThis model represents the full item state returned in responses,\nincluding the server-assigned identifier.",
+            "members": {
+              "id": {
+                "name": "id",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.models.Item.id",
+                "signature": null,
+                "docstring": null
+              }
+            }
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app.routes",
+        "signature": null,
+        "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThis module defines OpenAPI-bound operation handlers for a model-based\nCRUD service. Functions in this module are bound to HTTP routes\nexclusively via OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Domain models defined using\nPydantic are used for request and response payloads.\n\nNo routing decorators, path definitions, or implicit framework behavior\nappear in this module. All routing, HTTP methods, and schemas are defined\nin the OpenAPI specification.",
+        "members": {
+          "Response": {
+            "name": "Response",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.routes.Response",
+            "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+            "docstring": null
+          },
+          "HTTPException": {
+            "name": "HTTPException",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.routes.HTTPException",
+            "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+            "docstring": null
+          },
+          "ItemCreate": {
+            "name": "ItemCreate",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.routes.ItemCreate",
+            "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+            "docstring": null
+          },
+          "list_items": {
+            "name": "list_items",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.routes.list_items",
+            "signature": "<bound method Function.signature of Function('list_items', 29, 41)>",
+            "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+          },
+          "get_item": {
+            "name": "get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.routes.get_item",
+            "signature": "<bound method Function.signature of Function('get_item', 44, 69)>",
+            "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          },
+          "create_item": {
+            "name": "create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.routes.create_item",
+            "signature": "<bound method Function.signature of Function('create_item', 72, 93)>",
+            "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : ItemCreate\n    Request body describing the item to create.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nItem\n    The newly created item."
+          },
+          "update_item": {
+            "name": "update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.routes.update_item",
+            "signature": "<bound method Function.signature of Function('update_item', 96, 123)>",
+            "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          },
+          "delete_item": {
+            "name": "delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.routes.delete_item",
+            "signature": "<bound method Function.signature of Function('delete_item', 126, 156)>",
+            "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+          }
+        }
+      },
+      "test_model_app": {
+        "name": "test_model_app",
+        "kind": "module",
+        "path": "openapi_first.templates.model_app.test_model_app",
+        "signature": null,
+        "docstring": "End-to-end tests for the OpenAPI-first model CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store using Pydantic models.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Pydantic model-based request and response handling\n\nAll CRUD operations are exercised against an in-memory mock data store\nbacked by Pydantic domain models.\n\nThe tests assume:\n- OpenAPI-first route binding\n- Pydantic model validation\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process",
+        "members": {
+          "TestClient": {
+            "name": "TestClient",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.test_model_app.TestClient",
+            "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+            "docstring": null
+          },
+          "app": {
+            "name": "app",
+            "kind": "alias",
+            "path": "openapi_first.templates.model_app.test_model_app.app",
+            "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+            "docstring": null
+          },
+          "load_openapi": {
+            "name": "load_openapi",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.load_openapi",
+            "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+            "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+          },
+          "OpenAPIClient": {
+            "name": "OpenAPIClient",
+            "kind": "class",
+            "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient",
+            "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+            "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+            "members": {
+              "spec": {
+                "name": "spec",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.spec",
+                "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+                "docstring": null
+              },
+              "base_url": {
+                "name": "base_url",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.base_url",
+                "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+                "docstring": null
+              },
+              "client": {
+                "name": "client",
+                "kind": "attribute",
+                "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.client",
+                "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+                "docstring": null
+              },
+              "operations": {
+                "name": "operations",
+                "kind": "function",
+                "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.operations",
+                "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+                "docstring": null
+              }
+            }
+          },
+          "client": {
+            "name": "client",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.test_model_app.client",
+            "signature": null,
+            "docstring": null
+          },
+          "spec": {
+            "name": "spec",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.test_model_app.spec",
+            "signature": null,
+            "docstring": null
+          },
+          "test_list_items_initial": {
+            "name": "test_list_items_initial",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.test_list_items_initial",
+            "signature": "<bound method Function.signature of Function('test_list_items_initial', 37, 48)>",
+            "docstring": "Initial items should be present."
+          },
+          "test_get_item": {
+            "name": "test_get_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.test_get_item",
+            "signature": "<bound method Function.signature of Function('test_get_item', 51, 61)>",
+            "docstring": "Existing item should be retrievable by ID."
+          },
+          "test_create_item": {
+            "name": "test_create_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.test_create_item",
+            "signature": "<bound method Function.signature of Function('test_create_item', 64, 84)>",
+            "docstring": "Creating a new item should return the created entity."
+          },
+          "test_update_item": {
+            "name": "test_update_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.test_update_item",
+            "signature": "<bound method Function.signature of Function('test_update_item', 87, 111)>",
+            "docstring": "Updating an item should replace its values."
+          },
+          "test_delete_item": {
+            "name": "test_delete_item",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.test_delete_item",
+            "signature": "<bound method Function.signature of Function('test_delete_item', 114, 124)>",
+            "docstring": "Deleting an item should remove it from the store."
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.main.json

@@ -0,0 +1,39 @@
+{
+  "module": "openapi_first.templates.model_app.main",
+  "content": {
+    "path": "openapi_first.templates.model_app.main",
+    "docstring": "Application entry point for an OpenAPI-first model-based CRUD example service.\n\nThis module constructs a FastAPI application exclusively from an\nOpenAPI specification and a handler namespace, without using\ndecorator-driven routing.\n\nAll HTTP routes, methods, request/response schemas, and operation\nbindings are defined in the OpenAPI document referenced by\n``openapi_path``. Python callables defined in the ``routes`` module are\nbound to OpenAPI operations strictly via ``operationId``.\n\nThis module contains no routing logic, persistence concerns, or\nframework configuration beyond application assembly.\n\nDesign guarantees:\n- OpenAPI is the single source of truth\n- No undocumented routes can exist\n- Every OpenAPI operationId must resolve to exactly one handler\n- All contract violations fail at application startup\n\nThis file is intended to be used as the ASGI entry point.\n\nExample:\n    uvicorn main:app",
+    "objects": {
+      "OpenAPIFirstApp": {
+        "name": "OpenAPIFirstApp",
+        "kind": "class",
+        "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIFirstApp', 'openapi_first.app.OpenAPIFirstApp')>",
+        "docstring": "FastAPI application enforcing OpenAPI-first design.\n\nNotes:\n    **Responsibilities:**\n\n        - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route\n          registration with OpenAPI-driven binding.\n        - All routes are derived from the provided OpenAPI specification,\n          and each `operationId` is mapped to a Python function in the\n          supplied routes module.\n\n    **Guarantees:**\n\n        - No route can exist without an OpenAPI declaration.\n        - No OpenAPI operation can exist without a handler.\n        - Swagger UI and `/openapi.json` always reflect the provided spec.\n        - Handler functions remain framework-agnostic and testable.\n\nExample:\n    ```python\n    from openapi_first import OpenAPIFirstApp\n    import app.routes as routes\n\n    app = OpenAPIFirstApp(\n        openapi_path=\"app/openapi.json\",\n        routes_module=routes,\n        title=\"Example Service\",\n    )\n    ```",
+        "members": {
+          "openapi": {
+            "name": "openapi",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.main.OpenAPIFirstApp.openapi",
+            "signature": "<bound method Alias.signature of Alias('openapi', 'openapi_first.app.OpenAPIFirstApp.openapi')>",
+            "docstring": null
+          }
+        }
+      },
+      "routes": {
+        "name": "routes",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.main.routes",
+        "signature": "<bound method Alias.signature of Alias('routes', 'routes')>",
+        "docstring": null
+      },
+      "app": {
+        "name": "app",
+        "kind": "attribute",
+        "path": "openapi_first.templates.model_app.main.app",
+        "signature": null,
+        "docstring": null
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.models.json

@@ -0,0 +1,62 @@
+{
+  "module": "openapi_first.templates.model_app.models",
+  "content": {
+    "path": "openapi_first.templates.model_app.models",
+    "docstring": "Pydantic domain models for the CRUD example.\n\nThis module defines Pydantic models that represent the domain entities\nused by the service. These models are referenced by the OpenAPI\nspecification for request and response schemas.\n\nThe models are declarative and framework-agnostic. They contain no\npersistence logic, validation beyond type constraints, or business\nbehavior.\n\nThis module is not part of the ``openapi_first`` library API surface.\nIt exists solely to support the example application template.",
+    "objects": {
+      "BaseModel": {
+        "name": "BaseModel",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.models.BaseModel",
+        "signature": "<bound method Alias.signature of Alias('BaseModel', 'pydantic.BaseModel')>",
+        "docstring": null
+      },
+      "ItemBase": {
+        "name": "ItemBase",
+        "kind": "class",
+        "path": "openapi_first.templates.model_app.models.ItemBase",
+        "signature": "<bound method Class.signature of Class('ItemBase', 19, 27)>",
+        "docstring": "Base domain model for an item.\n\nDefines fields common to all item representations.",
+        "members": {
+          "name": {
+            "name": "name",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.models.ItemBase.name",
+            "signature": null,
+            "docstring": null
+          },
+          "price": {
+            "name": "price",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.models.ItemBase.price",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      },
+      "ItemCreate": {
+        "name": "ItemCreate",
+        "kind": "class",
+        "path": "openapi_first.templates.model_app.models.ItemCreate",
+        "signature": "<bound method Class.signature of Class('ItemCreate', 30, 39)>",
+        "docstring": "Domain model for item creation requests.\n\nThis model is used for request bodies when creating new items.\nIt intentionally excludes the ``id`` field, which is assigned\nby the service."
+      },
+      "Item": {
+        "name": "Item",
+        "kind": "class",
+        "path": "openapi_first.templates.model_app.models.Item",
+        "signature": "<bound method Class.signature of Class('Item', 42, 50)>",
+        "docstring": "Domain model for a persisted item.\n\nThis model represents the full item state returned in responses,\nincluding the server-assigned identifier.",
+        "members": {
+          "id": {
+            "name": "id",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.models.Item.id",
+            "signature": null,
+            "docstring": null
+          }
+        }
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.routes.json

@@ -0,0 +1,65 @@
+{
+  "module": "openapi_first.templates.model_app.routes",
+  "content": {
+    "path": "openapi_first.templates.model_app.routes",
+    "docstring": "CRUD route handlers bound via OpenAPI operationId.\n\nThis module defines OpenAPI-bound operation handlers for a model-based\nCRUD service. Functions in this module are bound to HTTP routes\nexclusively via OpenAPI ``operationId`` values.\n\nHandlers explicitly control HTTP response status codes to ensure runtime\nbehavior matches the OpenAPI contract. Domain models defined using\nPydantic are used for request and response payloads.\n\nNo routing decorators, path definitions, or implicit framework behavior\nappear in this module. All routing, HTTP methods, and schemas are defined\nin the OpenAPI specification.",
+    "objects": {
+      "Response": {
+        "name": "Response",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.routes.Response",
+        "signature": "<bound method Alias.signature of Alias('Response', 'fastapi.Response')>",
+        "docstring": null
+      },
+      "HTTPException": {
+        "name": "HTTPException",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.routes.HTTPException",
+        "signature": "<bound method Alias.signature of Alias('HTTPException', 'fastapi.HTTPException')>",
+        "docstring": null
+      },
+      "ItemCreate": {
+        "name": "ItemCreate",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.routes.ItemCreate",
+        "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
+        "docstring": null
+      },
+      "list_items": {
+        "name": "list_items",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.routes.list_items",
+        "signature": "<bound method Function.signature of Function('list_items', 29, 41)>",
+        "docstring": "List all items.\n\nImplements the OpenAPI operation identified by\n``operationId: list_items``.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
+      },
+      "get_item": {
+        "name": "get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.routes.get_item",
+        "signature": "<bound method Function.signature of Function('get_item', 44, 69)>",
+        "docstring": "Retrieve a single item by ID.\n\nImplements the OpenAPI operation identified by\n``operationId: get_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      },
+      "create_item": {
+        "name": "create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.routes.create_item",
+        "signature": "<bound method Function.signature of Function('create_item', 72, 93)>",
+        "docstring": "Create a new item.\n\nImplements the OpenAPI operation identified by\n``operationId: create_item``.\n\nParameters\n----------\npayload : ItemCreate\n    Request body describing the item to create.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nItem\n    The newly created item."
+      },
+      "update_item": {
+        "name": "update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.routes.update_item",
+        "signature": "<bound method Function.signature of Function('update_item', 96, 123)>",
+        "docstring": "Update an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: update_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      },
+      "delete_item": {
+        "name": "delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.routes.delete_item",
+        "signature": "<bound method Function.signature of Function('delete_item', 126, 156)>",
+        "docstring": "Delete an existing item.\n\nImplements the OpenAPI operation identified by\n``operationId: delete_item``.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\nresponse : fastapi.Response\n    Response object used to set the HTTP status code.\n\nReturns\n-------\nNone\n    No content.\n\nRaises\n------\nHTTPException\n    404 if the item does not exist."
+      }
+    }
+  }
+}

mcp_docs/modules/openapi_first.templates.model_app.test_model_app.json

@@ -0,0 +1,116 @@
+{
+  "module": "openapi_first.templates.model_app.test_model_app",
+  "content": {
+    "path": "openapi_first.templates.model_app.test_model_app",
+    "docstring": "End-to-end tests for the OpenAPI-first model CRUD example app.\n\nThese tests validate that all CRUD operations behave correctly\nagainst the in-memory mock data store using Pydantic models.\n- OpenAPI specification loading\n- OperationId-driven route binding on the server\n- OperationId-driven client invocation\n- Pydantic model-based request and response handling\n\nAll CRUD operations are exercised against an in-memory mock data store\nbacked by Pydantic domain models.\n\nThe tests assume:\n- OpenAPI-first route binding\n- Pydantic model validation\n- In-memory storage (no persistence guarantees)\n- Deterministic behavior in a single process",
+    "objects": {
+      "TestClient": {
+        "name": "TestClient",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.test_model_app.TestClient",
+        "signature": "<bound method Alias.signature of Alias('TestClient', 'fastapi.testclient.TestClient')>",
+        "docstring": null
+      },
+      "app": {
+        "name": "app",
+        "kind": "alias",
+        "path": "openapi_first.templates.model_app.test_model_app.app",
+        "signature": "<bound method Alias.signature of Alias('app', 'main.app')>",
+        "docstring": null
+      },
+      "load_openapi": {
+        "name": "load_openapi",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.load_openapi",
+        "signature": "<bound method Alias.signature of Alias('load_openapi', 'openapi_first.loader.load_openapi')>",
+        "docstring": "Load and validate an OpenAPI 3.x specification from disk.\n\nArgs:\n    path (str | Path):\n        Filesystem path to an OpenAPI specification file. Supported\n        extensions: `.json`, `.yaml`, `.yml`.\n\nReturns:\n    dict[str, Any]:\n        Parsed and validated OpenAPI specification.\n\nRaises:\n    OpenAPISpecLoadError:\n        If the file does not exist, cannot be parsed, or fails OpenAPI\n        schema validation.\n\nNotes:\n    **Guarantees:**\n\n        - The specification is parsed based on file extension and validated\n          using a strict OpenAPI schema validator.\n        - Any error results in an immediate exception, preventing\n          application startup."
+      },
+      "OpenAPIClient": {
+        "name": "OpenAPIClient",
+        "kind": "class",
+        "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient",
+        "signature": "<bound method Alias.signature of Alias('OpenAPIClient', 'openapi_first.client.OpenAPIClient')>",
+        "docstring": "OpenAPI-first HTTP client (`httpx`-based).\n\nNotes:\n    **Responsibilities:**\n\n        - This client derives all callable methods directly from an\n          OpenAPI 3.x specification. Each `operationId` becomes a method\n          on the client instance.\n\n    **Guarantees:**\n\n        - One callable per `operationId`.\n        - Explicit parameters (path, query, headers, body).\n        - No implicit schema inference or mutation.\n        - Returns raw `httpx.Response` objects.\n        - No response validation or deserialization.\n\nExample:\n    ```python\n    from openapi_first import loader, client\n\n    spec = loader.load_openapi(\"openapi.yaml\")\n\n    api = client.OpenAPIClient(\n        spec=spec,\n        base_url=\"http://localhost:8000\",\n    )\n\n    # Call operationId: getUser\n    response = api.getUser(\n        path_params={\"user_id\": 123}\n    )\n\n    print(response.status_code)\n    print(response.json())\n    ```",
+        "members": {
+          "spec": {
+            "name": "spec",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.spec",
+            "signature": "<bound method Alias.signature of Alias('spec', 'openapi_first.client.OpenAPIClient.spec')>",
+            "docstring": null
+          },
+          "base_url": {
+            "name": "base_url",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.base_url",
+            "signature": "<bound method Alias.signature of Alias('base_url', 'openapi_first.client.OpenAPIClient.base_url')>",
+            "docstring": null
+          },
+          "client": {
+            "name": "client",
+            "kind": "attribute",
+            "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.client",
+            "signature": "<bound method Alias.signature of Alias('client', 'openapi_first.client.OpenAPIClient.client')>",
+            "docstring": null
+          },
+          "operations": {
+            "name": "operations",
+            "kind": "function",
+            "path": "openapi_first.templates.model_app.test_model_app.OpenAPIClient.operations",
+            "signature": "<bound method Alias.signature of Alias('operations', 'openapi_first.client.OpenAPIClient.operations')>",
+            "docstring": null
+          }
+        }
+      },
+      "client": {
+        "name": "client",
+        "kind": "attribute",
+        "path": "openapi_first.templates.model_app.test_model_app.client",
+        "signature": null,
+        "docstring": null
+      },
+      "spec": {
+        "name": "spec",
+        "kind": "attribute",
+        "path": "openapi_first.templates.model_app.test_model_app.spec",
+        "signature": null,
+        "docstring": null
+      },
+      "test_list_items_initial": {
+        "name": "test_list_items_initial",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.test_list_items_initial",
+        "signature": "<bound method Function.signature of Function('test_list_items_initial', 37, 48)>",
+        "docstring": "Initial items should be present."
+      },
+      "test_get_item": {
+        "name": "test_get_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.test_get_item",
+        "signature": "<bound method Function.signature of Function('test_get_item', 51, 61)>",
+        "docstring": "Existing item should be retrievable by ID."
+      },
+      "test_create_item": {
+        "name": "test_create_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.test_create_item",
+        "signature": "<bound method Function.signature of Function('test_create_item', 64, 84)>",
+        "docstring": "Creating a new item should return the created entity."
+      },
+      "test_update_item": {
+        "name": "test_update_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.test_update_item",
+        "signature": "<bound method Function.signature of Function('test_update_item', 87, 111)>",
+        "docstring": "Updating an item should replace its values."
+      },
+      "test_delete_item": {
+        "name": "test_delete_item",
+        "kind": "function",
+        "path": "openapi_first.templates.model_app.test_model_app.test_delete_item",
+        "signature": "<bound method Function.signature of Function('test_delete_item', 114, 124)>",
+        "docstring": "Deleting an item should remove it from the store."
+      }
+    }
+  }
+}

mcp_docs/nav.json

@@ -0,0 +1,90 @@
+[
+  {
+    "module": "openapi_first",
+    "resource": "doc://modules/openapi_first"
+  },
+  {
+    "module": "openapi_first.app",
+    "resource": "doc://modules/openapi_first.app"
+  },
+  {
+    "module": "openapi_first.binder",
+    "resource": "doc://modules/openapi_first.binder"
+  },
+  {
+    "module": "openapi_first.cli",
+    "resource": "doc://modules/openapi_first.cli"
+  },
+  {
+    "module": "openapi_first.client",
+    "resource": "doc://modules/openapi_first.client"
+  },
+  {
+    "module": "openapi_first.errors",
+    "resource": "doc://modules/openapi_first.errors"
+  },
+  {
+    "module": "openapi_first.loader",
+    "resource": "doc://modules/openapi_first.loader"
+  },
+  {
+    "module": "openapi_first.templates",
+    "resource": "doc://modules/openapi_first.templates"
+  },
+  {
+    "module": "openapi_first.templates.crud_app",
+    "resource": "doc://modules/openapi_first.templates.crud_app"
+  },
+  {
+    "module": "openapi_first.templates.crud_app.data",
+    "resource": "doc://modules/openapi_first.templates.crud_app.data"
+  },
+  {
+    "module": "openapi_first.templates.crud_app.main",
+    "resource": "doc://modules/openapi_first.templates.crud_app.main"
+  },
+  {
+    "module": "openapi_first.templates.crud_app.routes",
+    "resource": "doc://modules/openapi_first.templates.crud_app.routes"
+  },
+  {
+    "module": "openapi_first.templates.crud_app.test_crud_app",
+    "resource": "doc://modules/openapi_first.templates.crud_app.test_crud_app"
+  },
+  {
+    "module": "openapi_first.templates.health_app",
+    "resource": "doc://modules/openapi_first.templates.health_app"
+  },
+  {
+    "module": "openapi_first.templates.health_app.main",
+    "resource": "doc://modules/openapi_first.templates.health_app.main"
+  },
+  {
+    "module": "openapi_first.templates.health_app.routes",
+    "resource": "doc://modules/openapi_first.templates.health_app.routes"
+  },
+  {
+    "module": "openapi_first.templates.model_app",
+    "resource": "doc://modules/openapi_first.templates.model_app"
+  },
+  {
+    "module": "openapi_first.templates.model_app.data",
+    "resource": "doc://modules/openapi_first.templates.model_app.data"
+  },
+  {
+    "module": "openapi_first.templates.model_app.main",
+    "resource": "doc://modules/openapi_first.templates.model_app.main"
+  },
+  {
+    "module": "openapi_first.templates.model_app.models",
+    "resource": "doc://modules/openapi_first.templates.model_app.models"
+  },
+  {
+    "module": "openapi_first.templates.model_app.routes",
+    "resource": "doc://modules/openapi_first.templates.model_app.routes"
+  },
+  {
+    "module": "openapi_first.templates.model_app.test_model_app",
+    "resource": "doc://modules/openapi_first.templates.model_app.test_model_app"
+  }
+]

mkdocs.yml

@@ -1,6 +1,3 @@
-site_name: Aetoskia Mail Intake
-site_description: Format-agnostic document reading, parsing, and scraping framework
-
 theme:
   name: material
   palette:
@@ -11,19 +8,26 @@ theme:
     text: Inter
     code: JetBrains Mono
   features:
-    - navigation.tabs
+  - navigation.sections
   - navigation.expand
   - navigation.top
   - navigation.instant
+  - navigation.tracking
+  - navigation.indexes
   - content.code.copy
   - content.code.annotate
-
+  - content.tabs.link
+  - content.action.edit
+  - search.highlight
+  - search.share
+  - search.suggest
 plugins:
 - search
 - mkdocstrings:
     handlers:
       python:
-          paths: ["."]
+        paths:
+        - .
         options:
           docstring_style: google
           show_source: false
@@ -34,17 +38,38 @@ plugins:
           annotations_path: brief
           show_root_heading: true
           group_by_category: true
-
+          show_category_heading: true
+          show_object_full_path: false
+          show_symbol_type_heading: true
+markdown_extensions:
+- pymdownx.superfences
+- pymdownx.inlinehilite
+- pymdownx.snippets
+- admonition
+- pymdownx.details
+- pymdownx.superfences
+- pymdownx.highlight:
+    linenums: true
+    anchor_linenums: true
+    line_spans: __span
+    pygments_lang_class: true
+- pymdownx.tabbed:
+    alternate_style: true
+- pymdownx.tasklist:
+    custom_checkbox: true
+- tables
+- footnotes
+- pymdownx.caret
+- pymdownx.tilde
+- pymdownx.mark
+site_name: openapi_first
 nav:
-  - Home: openapi_first/index.md
+- Home: index.md
-
+- Application Bootstrap:
-  - Core:
+  - app.md
-      - OpenAPI-First App: openapi_first/app.md
+  - binder.md
-      - Route Binder: openapi_first/binder.md
+- Core Utilities:
-      - Spec Loaders: openapi_first/loader.md
+  - loader.md
-
+  - errors.md
-  - CLI:
+- OpenAPI Client:
-      - Home: openapi_first/cli.md
+  - client.md
-
-  - Errors:
-      - Error Hierarchy: openapi_first/errors.md

openapi_first/__init__.py

@@ -1,4 +1,6 @@
 """
+# Summary
+
 FastAPI OpenAPI First — strict OpenAPI-first application bootstrap for FastAPI.
 
 FastAPI OpenAPI First is a **contract-first infrastructure library** that
@@ -7,135 +9,102 @@ enforces OpenAPI as the single source of truth for FastAPI services.
 The library removes decorator-driven routing and replaces it with
 deterministic, spec-driven application assembly. Every HTTP route,
 method, and operation is defined in OpenAPI first and bound to Python
-handlers explicitly via operationId.
+handlers explicitly via `operationId`.
 
-The package is intentionally minimal and layered. Each module has a
+---
-single responsibility and exposes explicit contracts rather than
-convenience facades.
 
-----------------------------------------------------------------------
+# Installation
-Architecture Overview
-----------------------------------------------------------------------
-
-The library is structured around three core responsibilities:
-
-- loader: load and validate OpenAPI 3.x specifications (JSON/YAML)
-- binder: bind OpenAPI operations to FastAPI routes via operationId
-- app: OpenAPI-first FastAPI application bootstrap
-- errors: explicit error hierarchy for contract violations
-
-The package root acts as a **namespace**, not a facade. Consumers are
-expected to import functionality explicitly from the appropriate module.
-
-----------------------------------------------------------------------
-Installation
-----------------------------------------------------------------------
 
 Install using pip:
 
+```bash
 pip install openapi-first
+```
 
 Or with Poetry:
 
+```bash
 poetry add openapi-first
+```
 
-Runtime dependencies are intentionally minimal:
+---
-- fastapi
-- openapi-spec-validator
-- pyyaml (optional, for YAML specs)
 
-The ASGI server (e.g., uvicorn) is an application-level dependency and is
+# Quick Start
-not bundled with this library.
-
-----------------------------------------------------------------------
-Basic Usage
-----------------------------------------------------------------------
 
 Minimal OpenAPI-first FastAPI application:
 
+```python
 from openapi_first import app
 import my_service.routes as routes
 
 api = app.OpenAPIFirstApp(
-        openapi_path="openapi.json",
+    openapi_path="openapi.yaml",
     routes_module=routes,
     title="My Service",
     version="1.0.0",
 )
+```
 
-    # Run with:
+OperationId-driven HTTP client:
-    # uvicorn my_service.main:api
 
-Handler definitions (no decorators):
+```python
+from openapi_first.loader import load_openapi
+from openapi_first.client import OpenAPIClient
 
-    def get_health():
+spec = load_openapi("openapi.yaml")
-        return {"status": "ok"}
+client = OpenAPIClient(spec)
 
-OpenAPI snippet:
+response = client.get_health()
+```
 
-    paths:
+---
-      /health:
-        get:
-          operationId: get_health
-          responses:
-            "200":
-              description: OK
 
-----------------------------------------------------------------------
+# Architecture
-Extensibility Model
-----------------------------------------------------------------------
 
-FastAPI OpenAPI First is designed to be extended via **explicit contracts**:
+The library is structured around four core responsibilities:
 
-- Users MAY extend OpenAPI loading behavior (e.g. multi-file specs)
+- `loader`: Load and validate OpenAPI 3.x specifications (JSON/YAML).
-  by wrapping or replacing `loader.load_openapi`
+- `binder`: Bind OpenAPI operations to FastAPI routes via `operationId`.
-- Users MAY extend route binding behavior by building on top of
+- `app`: OpenAPI-first FastAPI application bootstrap.
-  `binder.bind_routes`
+- `client`: OpenAPI-first HTTP client driven by the same specification.
-- Users MAY layer additional validation (e.g. signature checks)
+- `errors`: Explicit error hierarchy for contract violations.
-  without modifying core modules
 
-Users SHOULD NOT rely on FastAPI decorators for routing when using this
+---
-library. Mixing decorator-driven routes with OpenAPI-first routing
-defeats the contract guarantees and is explicitly unsupported.
 
-----------------------------------------------------------------------
+# Public API
-Public API Surface
-----------------------------------------------------------------------
 
 The supported public API consists of the following top-level modules:
 
-- openapi_first.app
+- `openapi_first.app`
-- openapi_first.binder
+- `openapi_first.binder`
-- openapi_first.loader
+- `openapi_first.loader`
-- openapi_first.errors
+- `openapi_first.client`
+- `openapi_first.errors`
 
-Classes and functions should be imported explicitly from these modules.
+---
-No individual symbols are re-exported at the package root.
 
-----------------------------------------------------------------------
+# Design Guarantees
-Design Guarantees
-----------------------------------------------------------------------
 
-- OpenAPI is the single source of truth
+- OpenAPI is the single source of truth.
-- No undocumented routes can exist
+- No undocumented routes can exist.
-- No OpenAPI operation can exist without a handler
+- No OpenAPI operation can exist without a handler or client callable.
-- All contract violations fail at application startup
+- All contract violations fail at application startup or client creation.
-- No hidden FastAPI magic or implicit behavior
+- No hidden FastAPI magic or implicit behavior.
-- Deterministic, testable application assembly
+- Deterministic, testable application assembly.
-- CI-friendly failure modes
 
-FastAPI OpenAPI First favors correctness, explicitness, and contract
+---
-enforcement over convenience shortcuts.
 """
 
 from . import app
 from . import binder
 from . import loader
+from . import client
 from . import errors
 
 __all__ = [
     "app",
     "binder",
     "loader",
+    "client",
     "errors",
 ]

openapi_first/__init__.pyi

@@ -0,0 +1,7 @@
+from . import app as app
+from . import binder as binder
+from . import loader as loader
+from . import client as client
+from . import errors as errors
+
+__all__ = ["app", "binder", "loader", "client", "errors"]

openapi_first/app.py

@@ -1,43 +1,35 @@
 """
-openapi_first.app
+# Summary
-=========================
 
 OpenAPI-first application bootstrap for FastAPI.
 
 This module provides `OpenAPIFirstApp`, a thin but strict abstraction
 that enforces OpenAPI as the single source of truth for a FastAPI service.
 
-Core principles
+Notes:
----------------
+    **Core Principles:**
+
         - The OpenAPI specification (JSON or YAML) defines the entire API surface.
-- Every operationId in the OpenAPI spec must have a corresponding
+        - Every `operationId` in the OpenAPI spec must have a corresponding
           Python handler function.
         - Handlers are plain Python callables (no FastAPI decorators).
         - FastAPI route registration is derived exclusively from the spec.
         - FastAPI's autogenerated OpenAPI schema is fully overridden.
 
-What this module does
+    **Responsibilities:**
----------------------
+
         - Loads and validates an OpenAPI 3.x specification.
-- Dynamically binds HTTP routes to handler functions using operationId.
+        - Dynamically binds HTTP routes to handler functions using `operationId`.
         - Registers routes with FastAPI at application startup.
         - Ensures runtime behavior matches the OpenAPI contract exactly.
 
-What this module does NOT do
+    **Constraints:**
-----------------------------
-- It does not generate OpenAPI specs.
-- It does not generate client code.
-- It does not introduce a new framework or lifecycle.
-- It does not alter FastAPI dependency injection semantics.
 
-Intended usage
+        - This module intentionally does NOT:
---------------
+            - Generate OpenAPI specs.
-This module is intended for teams that want:
+            - Generate client code.
-
+            - Introduce a new framework or lifecycle.
-- OpenAPI-first API development
+            - Alter FastAPI dependency injection semantics.
-- Strong contract enforcement
-- Minimal FastAPI boilerplate
-- Predictable, CI-friendly failures for spec/implementation drift
 """
 
 from fastapi import FastAPI
@@ -50,48 +42,33 @@ class OpenAPIFirstApp(FastAPI):
     """
     FastAPI application enforcing OpenAPI-first design.
 
-    `OpenAPIFirstApp` subclasses FastAPI and replaces manual route
+    Notes:
-    registration with OpenAPI-driven binding. All routes are derived
+        **Responsibilities:**
-    from the provided OpenAPI specification, and each operationId is
-    mapped to a Python function in the supplied routes module.
 
-    Parameters
+            - `OpenAPIFirstApp` subclasses `FastAPI` and replaces manual route
-    ----------
+              registration with OpenAPI-driven binding.
-    openapi_path : str
+            - All routes are derived from the provided OpenAPI specification,
-        Filesystem path to the OpenAPI 3.x specification file.
+              and each `operationId` is mapped to a Python function in the
-        This specification is treated as the authoritative API contract.
+              supplied routes module.
 
-    routes_module : module
+        **Guarantees:**
-        Python module containing handler functions whose names correspond
-        exactly to OpenAPI operationId values.
 
-    **fastapi_kwargs
-        Additional keyword arguments passed directly to `fastapi.FastAPI`
-        (e.g., title, version, middleware, lifespan handlers).
-
-    Raises
-    ------
-    OpenAPIFirstError
-        If the OpenAPI specification is invalid, or if any declared
-        operationId does not have a corresponding handler function.
-
-    Behavior guarantees
-    -------------------
             - No route can exist without an OpenAPI declaration.
             - No OpenAPI operation can exist without a handler.
             - Swagger UI and `/openapi.json` always reflect the provided spec.
             - Handler functions remain framework-agnostic and testable.
 
-    Example
+    Example:
-    -------
+        ```python
-    >>> from openapi_first import OpenAPIFirstApp
+        from openapi_first import OpenAPIFirstApp
-    >>> import app.routes as routes
+        import app.routes as routes
-    >>>
+
-    >>> app = OpenAPIFirstApp(
+        app = OpenAPIFirstApp(
-    ...     openapi_path="app/openapi.json",
+            openapi_path="app/openapi.json",
-    ...     routes_module=routes,
+            routes_module=routes,
-    ...     title="Example Service"
+            title="Example Service",
-    ... )
+        )
+        ```
     """
 
     def __init__(
@@ -101,6 +78,26 @@ class OpenAPIFirstApp(FastAPI):
         routes_module,
         **fastapi_kwargs,
     ):
+        """
+        Initialize the application.
+
+        Args:
+            openapi_path (str):
+                Filesystem path to the OpenAPI 3.x specification file. This
+                specification is treated as the authoritative API contract.
+            routes_module (module):
+                Python module containing handler functions whose names correspond
+                exactly to OpenAPI `operationId` values.
+            **fastapi_kwargs (Any):
+                Additional keyword arguments passed directly to
+                `fastapi.FastAPI` (e.g., title, version, middleware, lifespan
+                handlers).
+
+        Raises:
+            OpenAPIFirstError:
+                If the OpenAPI specification is invalid, or if any declared
+                `operationId` does not have a corresponding handler function.
+        """
         # Initialize FastAPI normally
         super().__init__(**fastapi_kwargs)
 

openapi_first/app.pyi

@@ -0,0 +1,5 @@
+from fastapi import FastAPI
+from typing import Any
+
+class OpenAPIFirstApp(FastAPI):
+    def __init__(self, *, openapi_path: str, routes_module: Any, **fastapi_kwargs: Any) -> None: ...

openapi_first/binder.py

@@ -1,36 +1,35 @@
 """
-openapi_first.binder
+# Summary
-============================
 
 OpenAPI-driven route binding for FastAPI.
 
 This module is responsible for translating an OpenAPI 3.x specification
 into concrete FastAPI routes. It enforces a strict one-to-one mapping
-between OpenAPI operations and Python handler functions using operationId.
+between OpenAPI operations and Python handler functions using `operationId`.
 
-Core responsibility
+Notes:
--------------------
+    **Core Responsibility:**
-- Read path + method definitions from an OpenAPI specification
+
-- Resolve each operationId to a Python callable
+        - Read path + method definitions from an OpenAPI specification.
-- Register routes with FastAPI using APIRoute
+        - Resolve each `operationId` to a Python callable.
-- Fail fast when contract violations are detected
+        - Register routes with FastAPI using `APIRoute`.
+        - Fail fast when contract violations are detected.
+
+    **Design Constraints:**
 
-Design constraints
-------------------
         - All routes MUST be declared in the OpenAPI specification.
-- All OpenAPI operations MUST define an operationId.
+        - All OpenAPI operations MUST define an `operationId`.
-- Every operationId MUST resolve to a handler function.
+        - Every `operationId` MUST resolve to a handler function.
         - Handlers are plain Python callables (no decorators required).
         - No implicit route creation or inference is allowed.
 
-This module intentionally does NOT:
+    **Constraints:**
--------------------------------
-- Perform request or response validation
-- Generate Pydantic models
-- Modify FastAPI dependency injection
-- Interpret OpenAPI semantics beyond routing metadata
 
-Those concerns belong to other layers or tooling.
+        - This module intentionally does NOT:
+            - Perform request or response validation.
+            - Generate Pydantic models.
+            - Modify FastAPI dependency injection.
+            - Interpret OpenAPI semantics beyond routing metadata.
 """
 
 from fastapi.routing import APIRoute
@@ -42,33 +41,32 @@ def bind_routes(app, spec: dict, routes_module) -> None:
     """
     Bind OpenAPI operations to FastAPI routes.
 
-    Iterates through the OpenAPI specification paths and methods,
+    Args:
-    resolves each operationId to a handler function, and registers
+        app (fastapi.FastAPI):
-    a corresponding APIRoute on the FastAPI application.
-
-    Parameters
-    ----------
-    app : fastapi.FastAPI
             The FastAPI application instance to which routes will be added.
-
+        spec (dict):
-    spec : dict
             Parsed OpenAPI 3.x specification dictionary.
+        routes_module (module):
+            Python module containing handler functions. Each handler's name MUST
+            exactly match an OpenAPI `operationId`.
 
-    routes_module : module
+    Raises:
-        Python module containing handler functions. Each handler's
+        MissingOperationHandler:
-        name MUST exactly match an OpenAPI operationId.
+            If an `operationId` is missing from the spec or if no corresponding
-
-    Raises
-    ------
-    MissingOperationHandler
-        If an operationId is missing from the spec or if no corresponding
             handler function exists in the routes module.
 
-    Behavior guarantees
+    Notes:
-    -------------------
+        **Responsibilities:**
-    - Route registration is deterministic and spec-driven.
+
-    - No route decorators are required or supported.
+            - Iterates through the OpenAPI specification paths and methods.
-    - Handler resolution errors surface at application startup.
+            - Resolves each `operationId` to a handler function, and registers
+              a corresponding `APIRoute` on the FastAPI application.
+
+        **Guarantees:**
+
+            - Route registration is deterministic and spec-driven. No route
+              decorators are required or supported. Handler resolution errors
+              surface at application startup.
     """
 
     paths = spec.get("paths", {})

openapi_first/binder.pyi

@@ -0,0 +1,4 @@
+from typing import Any, Dict
+from fastapi import FastAPI
+
+def bind_routes(app: FastAPI, spec: Dict[str, Any], routes_module: Any) -> None: ...

openapi_first/cli.py

@@ -1,19 +1,12 @@
 """
-openapi_first.cli
-========================
-
 Command-line interface for FastAPI OpenAPI-first scaffolding utilities.
 
-This module provides a small, focused CLI intended to help developers
+---
-quickly bootstrap OpenAPI-first FastAPI services using bundled project
-templates.
 
-Currently supported scaffolds:
+## Summary
-- Health check service (minimal OpenAPI-first application)
 
-The CLI copies versioned templates packaged with the library into a
+This CLI bootstraps OpenAPI-first FastAPI applications from versioned,
-user-specified directory, allowing rapid local development without
+bundled templates packaged with the library.
-manual setup.
 """
 
 import argparse
@@ -22,68 +15,89 @@ from pathlib import Path
 from importlib import resources
 
 
-def copy_health_app_template(target_dir: Path) -> None:
+DEFAULT_TEMPLATE = "health_app"
+
+
+def available_templates() -> list[str]:
     """
-    Copy the bundled OpenAPI-first health app template into a directory.
+    Return a list of available application templates.
 
-    This function copies a fully working, minimal OpenAPI-first FastAPI
+    Returns:
-    health check application from the package's embedded templates into
+        list[str]:
-    the specified target directory.
+            Sorted list of template names found in the internal templates directory.
+    """
+    root = resources.files("openapi_first.templates")
+    return sorted(
+        item.name
+        for item in root.iterdir()
+        if item.is_dir() and not item.name.startswith("_")
+    )
 
-    The target directory will be created if it does not already exist.
-    Existing files may be overwritten.
 
-    Parameters
+def copy_template(template: str, target_dir: Path) -> None:
-    ----------
+    """
-    target_dir : pathlib.Path
+    Copy a bundled OpenAPI-first application template into a directory.
-        Destination directory into which the health app template
-        should be copied.
 
-    Raises
+    Args:
-    ------
+        template (str):
-    FileNotFoundError
+            Name of the template to copy.
-        If the bundled health app template cannot be located.
+        target_dir (Path):
+            Filesystem path where the template should be copied.
+
+    Raises:
+        FileNotFoundError:
+            If the requested template does not exist.
     """
     target_dir = target_dir.resolve()
     target_dir.mkdir(parents=True, exist_ok=True)
 
-    with resources.files("openapi_first.templates").joinpath(
+    root = resources.files("openapi_first.templates")
-        "health_app"
+    src = root / template
-    ) as src:
+
-        shutil.copytree(src, target_dir, dirs_exist_ok=True)
+    if not src.exists():
+        raise FileNotFoundError(
+            f"Template '{template}' not found. "
+            f"Available templates: {', '.join(available_templates())}"
+        )
+
+    with resources.as_file(src) as path:
+        shutil.copytree(path, target_dir, dirs_exist_ok=True)
 
 
 def main() -> None:
-    """
-    Entry point for the FastAPI OpenAPI-first CLI.
-
-    Parses command-line arguments and initializes a new OpenAPI-first
-    health check application by copying the bundled template into the
-    specified directory.
-
-    If no target path is provided, the scaffold is created in a directory
-    named ``health-app`` in the current working directory.
-
-    Example
-    -------
-    Create a health app in the default directory::
-
-        openapi-first
-
-    Create a health app in a custom directory::
-
-        openapi-first my-service
-    """
     parser = argparse.ArgumentParser(
         description="FastAPI OpenAPI-first scaffolding tools"
     )
+    parser.add_argument(
+        "template",
+        nargs="?",
+        default=DEFAULT_TEMPLATE,
+        help=f"Template name (default: {DEFAULT_TEMPLATE})",
+    )
     parser.add_argument(
         "path",
         nargs="?",
-        default="health-app",
+        default=None,
-        help="Target directory for the health app",
+        help="Target directory (defaults to template name)",
+    )
+    parser.add_argument(
+        "--list",
+        action="store_true",
+        help="List available templates and exit",
     )
 
     args = parser.parse_args()
-    copy_health_app_template(Path(args.path))
+
-    print(f"Health app created at {args.path}")
+    if args.list:
+        for name in available_templates():
+            print(name)
+        return
+
+    target = Path(args.path or args.template.replace("_", "-"))
+
+    try:
+        copy_template(args.template, target)
+    except Exception as exc:
+        raise SystemExit(str(exc)) from exc
+
+    print(f"Template '{args.template}' created at {target}")

openapi_first/client.py

@@ -0,0 +1,257 @@
+"""
+# Summary
+
+OpenAPI-first HTTP client for contract-driven services.
+
+This module provides `OpenAPIClient`, a thin, strict HTTP client that
+derives all callable operations directly from an OpenAPI 3.x specification.
+
+It is the client counterpart to `OpenAPIFirstApp`.
+
+Notes:
+    **Core Principles:**
+
+        - The OpenAPI specification is the single source of truth
+        - Each operationId becomes a callable Python method
+        - No implicit schema mutation or inference
+        - No code generation step
+        - Minimal abstraction over httpx
+
+    **Responsibilities:**
+
+        - Parses an OpenAPI 3.x specification
+        - Dynamically creates one callable per operationId
+        - Enforces presence of servers, paths, and operationId
+        - Formats path parameters safely
+        - Handles JSON request bodies explicitly
+        - Returns raw `httpx.Response` objects
+
+    **Constraints:**
+
+        - This module intentionally does NOT: Generate client code, validate request/response schemas, deserialize responses, retry requests, implement authentication helpers, or assume non-2xx responses are failures.
+"""
+
+from typing import Any, Callable, Dict, Optional
+from urllib.parse import urljoin
+
+import httpx
+
+from .errors import OpenAPIFirstError
+
+
+class OpenAPIClientError(OpenAPIFirstError):
+    """
+    Raised when an OpenAPI client operation fails.
+    """
+
+
+class OpenAPIClient:
+    """
+    OpenAPI-first HTTP client (`httpx`-based).
+
+    Notes:
+        **Responsibilities:**
+
+            - This client derives all callable methods directly from an
+              OpenAPI 3.x specification. Each `operationId` becomes a method
+              on the client instance.
+
+        **Guarantees:**
+
+            - One callable per `operationId`.
+            - Explicit parameters (path, query, headers, body).
+            - No implicit schema inference or mutation.
+            - Returns raw `httpx.Response` objects.
+            - No response validation or deserialization.
+
+    Example:
+        ```python
+        from openapi_first import loader, client
+
+        spec = loader.load_openapi("openapi.yaml")
+
+        api = client.OpenAPIClient(
+            spec=spec,
+            base_url="http://localhost:8000",
+        )
+
+        # Call operationId: getUser
+        response = api.getUser(
+            path_params={"user_id": 123}
+        )
+
+        print(response.status_code)
+        print(response.json())
+        ```
+    """
+
+    def __init__(
+        self,
+        spec: dict[str, Any],
+        base_url: Optional[str] = None,
+        client: Optional[httpx.Client] = None,
+    ) -> None:
+        """
+        Initialize the OpenAPI client.
+
+        Args:
+            spec (dict[str, Any]):
+                Parsed OpenAPI 3.x specification.
+            base_url (str, optional):
+                Base URL of the target service. If omitted, the first entry in the OpenAPI `servers` list is used.
+            client (httpx.Client, optional):
+                Optional preconfigured httpx client instance.
+
+        Raises:
+            OpenAPIClientError:
+                If no servers are defined, spec has no paths, operationIds are missing/duplicate, or required parameters are missing.
+        """
+        self.spec = spec
+        self.base_url = base_url or self._resolve_base_url(spec)
+        self.client = client or httpx.Client(base_url=self.base_url)
+
+        self._operations: Dict[str, Callable[..., httpx.Response]] = {}
+        self._build_operations()
+
+    # ------------------------------------------------------------------ #
+    # Public API
+    # ------------------------------------------------------------------ #
+
+    def __getattr__(self, name: str) -> Callable[..., httpx.Response]:
+        try:
+            return self._operations[name]
+        except KeyError:
+            raise AttributeError(f"No such operationId: {name}") from None
+
+    def operations(self) -> Dict[str, Callable[..., httpx.Response]]:
+        return dict(self._operations)
+
+    # ------------------------------------------------------------------ #
+    # Internal mechanics
+    # ------------------------------------------------------------------ #
+
+    def _resolve_base_url(self, spec: dict[str, Any]) -> str:
+        servers = spec.get("servers")
+        if not servers:
+            raise OpenAPIClientError("No servers defined in OpenAPI spec")
+
+        url = servers[0].get("url")
+        if not url:
+            raise OpenAPIClientError("Server entry missing 'url'")
+
+        return url.rstrip("/") + "/"
+
+    def _build_operations(self) -> None:
+        paths = self.spec.get("paths", {})
+        if not paths:
+            raise OpenAPIClientError("OpenAPI spec contains no paths")
+
+        for path, path_item in paths.items():
+            for method, operation in path_item.items():
+                if method.lower() not in {
+                    "get", "post", "put", "patch", "delete", "head", "options"
+                }:
+                    continue
+
+                operation_id = operation.get("operationId")
+                if not operation_id:
+                    raise OpenAPIClientError(
+                        f"Missing operationId for {method.upper()} {path}"
+                    )
+
+                if operation_id in self._operations:
+                    raise OpenAPIClientError(
+                        f"Duplicate operationId detected: {operation_id}"
+                    )
+
+                self._operations[operation_id] = self._make_operation(
+                    method=method.upper(),
+                    path=path,
+                    operation=operation,
+                )
+
+    def _make_operation(
+        self,
+        *,
+        method: str,
+        path: str,
+        operation: dict[str, Any],
+    ) -> Callable[..., httpx.Response]:
+        request_body = operation.get("requestBody")
+
+        def call(
+            *,
+            path_params: Optional[dict[str, Any]] = None,
+            query: Optional[dict[str, Any]] = None,
+            headers: Optional[dict[str, str]] = None,
+            body: Optional[Any] = None,
+            timeout: Optional[float] = None,
+        ) -> httpx.Response:
+            url = self._build_url(path, path_params or {})
+
+            req_headers = headers.copy() if headers else {}
+
+            json_data = None
+            content = None
+
+            if request_body is not None:
+                if body is None:
+                    raise OpenAPIClientError(
+                        f"Request body required for operation {operation['operationId']}"
+                    )
+
+                media_types = request_body.get("content", {})
+                if "application/json" in media_types:
+                    json_data = body
+                    req_headers.setdefault("Content-Type", "application/json")
+                else:
+                    content = body
+
+            response = self.client.request(
+                method=method,
+                url=url,
+                params=query,
+                headers=req_headers,
+                json=json_data,
+                content=content,
+                timeout=timeout,
+            )
+
+            return response
+
+        call.__name__ = operation["operationId"]
+        call.__doc__ = self._build_docstring(method, path, operation)
+
+        return call
+
+    def _build_url(self, path: str, path_params: dict[str, Any]) -> str:
+        try:
+            formatted_path = path.format(**path_params)
+        except KeyError as exc:
+            raise OpenAPIClientError(
+                f"Missing path parameter: {exc.args[0]}"
+            ) from exc
+
+        return urljoin(self.base_url, formatted_path.lstrip("/"))
+
+    def _build_docstring(
+        self,
+        method: str,
+        path: str,
+        operation: dict[str, Any],
+    ) -> str:
+        lines = [
+            f"{method} {path}",
+            "",
+            operation.get("summary", ""),
+            "",
+            "Parameters:",
+            "  path_params: dict | None",
+            "  query: dict | None",
+            "  headers: dict | None",
+            "  body: Any | None",
+            "",
+            "Returns:",
+            "  httpx.Response",
+        ]
+        return "\n".join(lines)

openapi_first/client.pyi

@@ -0,0 +1,13 @@
+from typing import Any, Callable, Dict, Optional
+import httpx
+from .errors import OpenAPIFirstError
+
+class OpenAPIClientError(OpenAPIFirstError): ...
+
+class OpenAPIClient:
+    spec: Dict[str, Any]
+    base_url: str
+    client: httpx.Client
+    def __init__(self, spec: Dict[str, Any], base_url: Optional[str] = ..., client: Optional[httpx.Client] = ...) -> None: ...
+    def __getattr__(self, name: str) -> Callable[..., httpx.Response]: ...
+    def operations(self) -> Dict[str, Callable[..., httpx.Response]]: ...

openapi_first/errors.py

@@ -1,16 +1,16 @@
 """
-openapi_first.errors
+# Summary
-============================
 
-Custom exceptions for OpenAPI-first FastAPI applications.
+Exceptions for OpenAPI-first FastAPI applications.
 
 This module defines a small hierarchy of explicit, intention-revealing
 exceptions used to signal contract violations between an OpenAPI
 specification and its Python implementation.
 
-Design principles
+Notes:
------------------
+    **Design Principles:**
-- Errors represent *programmer mistakes*, not runtime conditions.
+
+        - Errors represent programmer mistakes, not runtime conditions.
         - All errors are raised during application startup.
         - Messages are actionable and suitable for CI/CD output.
         - Exceptions are explicit rather than reused from generic built-ins.
@@ -22,12 +22,14 @@ class OpenAPIFirstError(Exception):
     """
     Base exception for all OpenAPI-first enforcement errors.
 
-    This exception exists to allow callers, test suites, and CI pipelines
+    Notes:
-    to catch and distinguish OpenAPI contract violations from unrelated
+        **Responsibilities:**
-    runtime errors.
 
-    All exceptions raised by the OpenAPI-first core should inherit from
+            - This exception exists to allow callers, test suites, and CI
-    this type.
+              pipelines to catch and distinguish OpenAPI contract violations
+              from unrelated runtime errors.
+            - All exceptions raised by the OpenAPI-first core should inherit
+              from this type.
     """
     pass
 
@@ -36,26 +38,30 @@ class MissingOperationHandler(OpenAPIFirstError):
     """
     Raised when an OpenAPI operation cannot be resolved to a handler.
 
-    This error occurs when:
+    Notes:
-    - An OpenAPI operation does not define an operationId, or
+        **Scenarios:**
-    - An operationId is defined but no matching function exists in the
-      provided routes module.
 
-    This represents a violation of the OpenAPI-first contract and
+            - An OpenAPI operation does not define an `operationId`.
-    indicates that the specification and implementation are out of sync.
+            - An `operationId` is defined but no matching function exists in
+              the provided routes module.
+
+        **Guarantees:**
+
+            - This represents a violation of the OpenAPI-first contract and
+              indicates that the specification and implementation are out of
+              sync.
     """
 
     def __init__(self, *, path: str, method: str, operation_id: str | None = None):
         """
-        Parameters
+        Initialize the error.
-        ----------
+
-        path : str
+        Args:
+            path (str):
                 The HTTP path declared in the OpenAPI specification.
-
+            method (str):
-        method : str
                 The HTTP method (as declared in the OpenAPI spec).
-
+            operation_id (str, optional):
-        operation_id : str, optional
                 The operationId declared in the OpenAPI spec, if present.
         """
         if operation_id:

openapi_first/errors.pyi

@@ -0,0 +1,6 @@
+from typing import Optional
+
+class OpenAPIFirstError(Exception): ...
+
+class MissingOperationHandler(OpenAPIFirstError):
+    def __init__(self, *, path: str, method: str, operation_id: Optional[str] = ...) -> None: ...

openapi_first/loader.py

@@ -1,6 +1,5 @@
 """
-openapi_first.loaders
+# Summary
-=============================
 
 OpenAPI specification loading and validation utilities.
 
@@ -10,22 +9,22 @@ from disk and validating it before it is used by the application.
 It enforces the principle that an invalid or malformed OpenAPI document
 must never reach the routing or runtime layers.
 
-Design principles
+Notes:
------------------
+    **Design Principles:**
+
         - OpenAPI is treated as an authoritative contract.
         - Invalid specifications fail fast at application startup.
         - Supported formats are JSON and YAML.
         - Validation errors are surfaced clearly and early.
 
-This module intentionally does NOT:
+    **Constraints:**
------------------------------------
-- Modify the OpenAPI document
-- Infer missing fields
-- Generate models or code
-- Perform request/response validation at runtime
-"""
 
-from __future__ import annotations
+        - This module intentionally does NOT:
+            - Modify the OpenAPI document.
+            - Infer missing fields.
+            - Generate models or code.
+            - Perform request/response validation at runtime.
+"""
 
 import json
 from pathlib import Path
@@ -41,7 +40,10 @@ class OpenAPISpecLoadError(OpenAPIFirstError):
     """
     Raised when an OpenAPI specification cannot be loaded or validated.
 
-    This error indicates that the OpenAPI document is unreadable,
+    Notes:
+        **Guarantees:**
+
+            - This error indicates that the OpenAPI document is unreadable,
               malformed, or violates the OpenAPI 3.x specification.
     """
     pass
@@ -51,29 +53,27 @@ def load_openapi(path: str | Path) -> dict[str, Any]:
     """
     Load and validate an OpenAPI 3.x specification from disk.
 
-    The specification is parsed based on file extension and validated
+    Args:
-    using a strict OpenAPI schema validator. Any error results in an
+        path (str | Path):
-    immediate exception, preventing application startup.
+            Filesystem path to an OpenAPI specification file. Supported
+            extensions: `.json`, `.yaml`, `.yml`.
 
-    Parameters
+    Returns:
-    ----------
+        dict[str, Any]:
-    path : str or pathlib.Path
-        Filesystem path to an OpenAPI specification file.
-        Supported extensions:
-        - `.json`
-        - `.yaml`
-        - `.yml`
-
-    Returns
-    -------
-    dict
             Parsed and validated OpenAPI specification.
 
-    Raises
+    Raises:
-    ------
+        OpenAPISpecLoadError:
-    OpenAPISpecLoadError
+            If the file does not exist, cannot be parsed, or fails OpenAPI
-        If the file does not exist, cannot be parsed, or fails
+            schema validation.
-        OpenAPI schema validation.
+
+    Notes:
+        **Guarantees:**
+
+            - The specification is parsed based on file extension and validated
+              using a strict OpenAPI schema validator.
+            - Any error results in an immediate exception, preventing
+              application startup.
     """
     spec_path = Path(path)
 

openapi_first/loader.pyi

@@ -0,0 +1,8 @@
+from pathlib import Path
+from typing import Any, Dict, Union
+
+from .errors import OpenAPIFirstError
+
+class OpenAPISpecLoadError(OpenAPIFirstError): ...
+
+def load_openapi(path: Union[str, Path]) -> Dict[str, Any]: ...

openapi_first/templates/__init__.py

@@ -0,0 +1,18 @@
+"""
+Application templates for FastAPI OpenAPI First.
+
+This package contains example and scaffolding templates intended to be
+copied into user projects via the ``openapi-first`` CLI.
+
+Templates in this package are:
+- Reference implementations of OpenAPI-first services
+- Not part of the ``openapi_first`` public or internal API
+- Not intended to be imported as runtime dependencies
+
+The presence of this file exists solely to:
+- Mark the directory as an explicit Python package
+- Enable deterministic tooling behavior (documentation, packaging)
+- Avoid accidental traversal of non-package directories
+
+No code in this package should be imported by library consumers.
+"""

openapi_first/templates/crud_app/__init__.py

@@ -0,0 +1,99 @@
+"""
+OpenAPI-first CRUD application template.
+
+This package contains a complete, minimal example of an OpenAPI-first
+CRUD service built using the ``openapi_first`` library.
+
+The application is assembled exclusively from:
+- an OpenAPI specification (``openapi.yaml``)
+- a handler namespace implementing CRUD operations (``routes``)
+- an in-memory mock data store (``data``)
+
+All HTTP routes, methods, schemas, and operation bindings are defined
+in the OpenAPI specification and enforced at application startup.
+No decorator-driven routing or implicit framework behavior is used.
+
+This template demonstrates:
+- operationId-driven server-side route binding
+- explicit HTTP status code control in handlers
+- operationId-driven client usage against the same OpenAPI contract
+- end-to-end validation using in-memory data and tests
+
+----------------------------------------------------------------------
+Scaffolding via CLI
+----------------------------------------------------------------------
+
+Create a new CRUD example service using the bundled template:
+
+    openapi-first crud_app
+
+Create the service in a custom directory:
+
+    openapi-first crud_app my-crud-service
+
+List all available application templates:
+
+    openapi-first --list
+
+The CLI copies template files verbatim into the target directory.
+No code is generated or modified beyond the copied scaffold.
+
+----------------------------------------------------------------------
+Client Usage Example
+----------------------------------------------------------------------
+
+The same OpenAPI specification used by the server can be used to
+construct a strict, operationId-driven HTTP client.
+
+Example client calls for CRUD operations:
+
+    from openapi_first.loader import load_openapi
+    from openapi_first.client import OpenAPIClient
+
+    spec = load_openapi("openapi.yaml")
+    client = OpenAPIClient(spec)
+
+    # List items
+    response = client.list_items()
+
+    # Get item by ID
+    response = client.get_item(
+        path_params={"item_id": 1}
+    )
+
+    # Create item
+    response = client.create_item(
+        body={"name": "Orange", "price": 0.8}
+    )
+
+    # Update item
+    response = client.update_item(
+        path_params={"item_id": 1},
+        body={"name": "Green Apple", "price": 0.6},
+    )
+
+    # Delete item
+    response = client.delete_item(
+        path_params={"item_id": 1}
+    )
+
+Client guarantees:
+- One callable per OpenAPI ``operationId``
+- No hardcoded URLs or HTTP methods in user code
+- Path and request parameters must match the OpenAPI specification
+- Invalid or incomplete OpenAPI specs fail at client construction time
+
+----------------------------------------------------------------------
+Non-Goals
+----------------------------------------------------------------------
+
+This template is intentionally minimal and is NOT:
+- production-ready
+- persistent or concurrency-safe
+- a reference architecture for data storage
+
+It exists solely as a copyable example for learning, testing, and
+bootstrapping OpenAPI-first services.
+
+This package is not part of the ``openapi_first`` library API surface.
+"""

openapi_first/templates/crud_app/data.py

@@ -0,0 +1,132 @@
+"""
+In-memory mock data store for CRUD example.
+
+This module intentionally avoids persistence and concurrency guarantees.
+It is suitable for demos, tests, and scaffolding only.
+
+It intentionally avoids
+- persistence
+- concurrency guarantees
+- validation
+- error handling
+
+The implementation is suitable for:
+- demonstrations
+- tests
+- scaffolding and example services
+
+It is explicitly NOT suitable for production use.
+
+This module is not part of the ``openapi_first`` library API surface.
+"""
+
+from typing import Dict
+
+
+# In-memory storage keyed by item ID.
+_items: Dict[int, dict] = {
+    1: {"id": 1, "name": "Apple", "price": 0.5},
+    2: {"id": 2, "name": "Banana", "price": 0.3},
+}
+
+# Auto-incrementing ID counter.
+_next_id = 3
+
+
+def list_items():
+    """
+    Return all items in the data store.
+
+    This function performs no filtering, pagination, or sorting.
+    The returned collection reflects the current in-memory state.
+
+    Returns
+    -------
+    list[dict]
+        A list of item representations.
+    """
+    return list(_items.values())
+
+
+def get_item(item_id: int):
+    """
+    Retrieve a single item by ID.
+
+    This function assumes the item exists and will raise ``KeyError``
+    if the ID is not present in the store.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to retrieve.
+
+    Returns
+    -------
+    dict
+        The stored item representation.
+    """
+    return _items[item_id]
+
+
+def create_item(payload: dict):
+    """
+    Create a new item in the data store.
+
+    A new integer ID is assigned automatically. No validation is
+    performed on the provided payload.
+
+    Parameters
+    ----------
+    payload : dict
+        Item attributes excluding the ``id`` field.
+
+    Returns
+    -------
+    dict
+        The newly created item, including its assigned ID.
+    """
+    global _next_id
+    item = {"id": _next_id, **payload}
+    _items[_next_id] = item
+    _next_id += 1
+    return item
+
+
+def update_item(item_id: int, payload: dict):
+    """
+    Replace an existing item in the data store.
+
+    This function overwrites the existing item entirely and does not
+    perform partial updates or validation. If the item does not exist,
+    it will be created implicitly.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to update.
+    payload : dict
+        Item attributes excluding the ``id`` field.
+
+    Returns
+    -------
+    dict
+        The updated item representation.
+    """
+    item = {"id": item_id, **payload}
+    _items[item_id] = item
+    return item
+
+
+def delete_item(item_id: int):
+    """
+    Remove an item from the data store.
+
+    This function assumes the item exists and will raise ``KeyError``
+    if the ID is not present.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to delete.
+    """
+    del _items[item_id]

openapi_first/templates/crud_app/main.py

@@ -0,0 +1,35 @@
+"""
+Application entry point for an OpenAPI-first CRUD example service.
+
+This module constructs a FastAPI application exclusively from an
+OpenAPI specification and a handler namespace, without using
+decorator-driven routing.
+
+All HTTP routes, methods, request/response schemas, and operation
+bindings are defined in the OpenAPI document referenced by
+``openapi_path``. Python callables defined in the ``routes`` module are
+bound to OpenAPI operations strictly via ``operationId``.
+
+This module contains no routing logic, persistence concerns, or
+framework configuration beyond application assembly.
+
+Design guarantees:
+- OpenAPI is the single source of truth
+- No undocumented routes can exist
+- Every OpenAPI operationId must resolve to exactly one handler
+- All contract violations fail at application startup
+
+This file is intended to be used as the ASGI entry point.
+
+Example:
+    uvicorn main:app
+"""
+
+from openapi_first.app import OpenAPIFirstApp
+import routes
+
+app = OpenAPIFirstApp(
+    openapi_path="openapi.yaml",
+    routes_module=routes,
+    title="CRUD Example Service",
+)

openapi_first/templates/crud_app/openapi.yaml

@@ -0,0 +1,115 @@
+openapi: 3.0.3
+info:
+  title: CRUD Example Service
+  version: "1.0.0"
+  description: Minimal OpenAPI-first CRUD service with in-memory mock data.
+
+paths:
+  /items:
+    get:
+      operationId: list_items
+      summary: List all items
+      responses:
+        "200":
+          description: List of items
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/Item"
+
+    post:
+      operationId: create_item
+      summary: Create a new item
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ItemCreate"
+      responses:
+        "201":
+          description: Item created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+
+  /items/{item_id}:
+    get:
+      operationId: get_item
+      summary: Get item by ID
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "200":
+          description: Item found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+
+    put:
+      operationId: update_item
+      summary: Update an item
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ItemCreate"
+      responses:
+        "200":
+          description: Item updated
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+
+    delete:
+      operationId: delete_item
+      summary: Delete an item
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "204":
+          description: Item deleted
+
+components:
+  schemas:
+    Item:
+      type: object
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        price:
+          type: number
+          format: float
+      required: [id, name, price]
+
+    ItemCreate:
+      type: object
+      properties:
+        name:
+          type: string
+        price:
+          type: number
+          format: float
+      required: [name, price]

openapi_first/templates/crud_app/routes.py

@@ -0,0 +1,158 @@
+"""
+CRUD route handlers bound via OpenAPI operationId.
+
+These handlers explicitly control HTTP status codes to ensure
+runtime behavior matches the OpenAPI contract.
+
+This module defines OpenAPI-bound operation handlers for a simple CRUD
+service. Functions in this module are bound to HTTP routes exclusively
+via OpenAPI ``operationId`` values.
+
+Handlers explicitly control HTTP response status codes to ensure runtime
+behavior matches the OpenAPI contract. Error conditions are translated
+into explicit HTTP responses rather than relying on implicit framework
+behavior.
+
+No routing decorators or path definitions appear in this module. All
+routing, HTTP methods, and schemas are defined in the OpenAPI
+specification.
+"""
+
+from fastapi import Response, HTTPException
+
+from data import (
+    list_items as _list_items,
+    get_item as _get_item,
+    create_item as _create_item,
+    update_item as _update_item,
+    delete_item as _delete_item,
+)
+
+
+def list_items():
+    """
+    List all items.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: list_items``.
+
+    Returns
+    -------
+    list[dict]
+        A list of item representations.
+    """
+    return _list_items()
+
+
+def get_item(item_id: int):
+    """
+    Retrieve a single item by ID.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: get_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to retrieve.
+
+    Returns
+    -------
+    dict
+        The requested item.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        return _get_item(item_id)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+
+def create_item(payload: dict, response: Response):
+    """
+    Create a new item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: create_item``.
+
+    Parameters
+    ----------
+    payload : dict
+        Item attributes excluding the ``id`` field.
+    response : fastapi.Response
+        Response object used to set the HTTP status code.
+
+    Returns
+    -------
+    dict
+        The newly created item.
+    """
+    item = _create_item(payload)
+    response.status_code = 201
+    return item
+
+
+def update_item(item_id: int, payload: dict):
+    """
+    Update an existing item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: update_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to update.
+    payload : dict
+        Item attributes excluding the ``id`` field.
+
+    Returns
+    -------
+    dict
+        The updated item.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        return _update_item(item_id, payload)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+
+def delete_item(item_id: int, response: Response):
+    """
+    Delete an existing item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: delete_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to delete.
+    response : fastapi.Response
+        Response object used to set the HTTP status code.
+
+    Returns
+    -------
+    None
+        No content.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        _delete_item(item_id)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+    response.status_code = 204

openapi_first/templates/crud_app/test_crud_app.py

@@ -0,0 +1,125 @@
+"""
+End-to-end tests for the OpenAPI-first CRUD example app.
+
+These tests validate that all CRUD operations behave correctly
+against the in-memory mock data store.
+- OpenAPI specification loading
+- OperationId-driven route binding on the server
+- OperationId-driven client invocation
+- Correct HTTP status codes and response payloads
+
+The tests exercise all CRUD operations against an in-memory mock data
+store and assume deterministic behavior within a single process.
+
+The tests assume:
+- OpenAPI-first route binding
+- In-memory storage (no persistence guarantees)
+- Deterministic behavior in a single process
+- One-to-one correspondence between OpenAPI operationId values and
+  server/client callables
+"""
+
+from fastapi.testclient import TestClient
+
+from main import app
+from openapi_first.loader import load_openapi
+from openapi_first.client import OpenAPIClient
+
+
+client = TestClient(app)
+spec = load_openapi("openapi.yaml")
+client = OpenAPIClient(
+    spec=spec,
+    base_url="http://testserver",
+    client=client,
+)
+
+
+def test_list_items_initial():
+    """Initial items should be present."""
+    response = client.list_items()
+    assert response.status_code == 200
+
+    data = response.json()
+    assert isinstance(data, list)
+    assert len(data) >= 2
+
+    ids = {item["id"] for item in data}
+    assert 1 in ids
+    assert 2 in ids
+
+
+def test_get_item():
+    """Existing item should be retrievable by ID."""
+    response = client.get_item(
+        path_params={"item_id": 1}
+    )
+    assert response.status_code == 200
+
+    item = response.json()
+    assert item["id"] == 1
+    assert "name" in item
+    assert "price" in item
+
+
+def test_create_item():
+    """Creating a new item should return the created entity."""
+    payload = {
+        "name": "Orange",
+        "price": 0.8,
+    }
+
+    response = client.create_item(
+        body=payload
+    )
+    assert response.status_code == 201
+
+    item = response.json()
+    assert "id" in item
+    assert item["name"] == payload["name"]
+    assert item["price"] == payload["price"]
+
+    # Verify it appears in list
+    list_response = client.list_items()
+    ids = {i["id"] for i in list_response.json()}
+    assert item["id"] in ids
+
+
+def test_update_item():
+    """Updating an item should replace its values."""
+    payload = {
+        "name": "Green Apple",
+        "price": 0.6,
+    }
+
+    response = client.update_item(
+        path_params={"item_id": 1},
+        body=payload,
+    )
+    assert response.status_code == 200
+
+    item = response.json()
+    assert item["id"] == 1
+    assert item["name"] == payload["name"]
+    assert item["price"] == payload["price"]
+
+    # Verify persisted update
+    get_response = client.get_item(
+        path_params={"item_id": 1}
+    )
+    updated = get_response.json()
+    assert updated["name"] == payload["name"]
+    assert updated["price"] == payload["price"]
+
+
+def test_delete_item():
+    """Deleting an item should remove it from the store."""
+    response = client.delete_item(
+        path_params={"item_id": 2}
+    )
+    assert response.status_code == 204
+
+    # Verify deletion
+    list_response = client.list_items()
+    ids = {item["id"] for item in list_response.json()}
+    assert 2 not in ids

openapi_first/templates/health_app/__init__.py

@@ -0,0 +1,65 @@
+"""
+OpenAPI-first FastAPI application template.
+
+This package contains a minimal, fully working example of an
+OpenAPI-first FastAPI service built using the ``openapi_first`` library.
+
+The application is assembled exclusively from:
+- an OpenAPI specification (``openapi.yaml``)
+- a handler namespace (``routes``)
+
+No routing decorators, implicit behavior, or framework-specific
+convenience abstractions are used. All HTTP routes, methods, and
+operation bindings are defined in OpenAPI and enforced at application
+startup.
+
+This package is intended to be copied as a starting point for new
+services via the ``openapi-first`` CLI. It is not part of the
+``openapi_first`` library API surface.
+
+----------------------------------------------------------------------
+Scaffolding via CLI
+----------------------------------------------------------------------
+
+Create a new OpenAPI-first health check service using the bundled
+template:
+
+    openapi-first health_app
+
+Create the service in a custom directory:
+
+    openapi-first health_app my-health-service
+
+List all available application templates:
+
+    openapi-first --list
+
+The CLI copies template files verbatim into the target directory.
+No code is generated or modified beyond the copied scaffold.
+
+----------------------------------------------------------------------
+Client Usage Example
+----------------------------------------------------------------------
+
+The same OpenAPI specification used by the server can be used to
+construct a strict, operationId-driven HTTP client.
+
+Example client call for the ``get_health`` operation:
+
+    from openapi_first.loader import load_openapi
+    from openapi_first.client import OpenAPIClient
+
+    spec = load_openapi("openapi.yaml")
+    client = OpenAPIClient(spec)
+
+    response = client.get_health()
+
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}
+
+Client guarantees:
+- One callable per OpenAPI ``operationId``
+- No hardcoded URLs or HTTP methods in user code
+- Path and request parameters must match the OpenAPI specification
+- Invalid or incomplete OpenAPI specs fail at client construction time
+"""

openapi_first/templates/health_app/main.py

@@ -1,3 +1,31 @@
+"""
+Application entry point for an OpenAPI-first FastAPI service.
+
+This module constructs a FastAPI application exclusively from an
+OpenAPI specification and a handler namespace, without using
+decorator-driven routing.
+
+All HTTP routes, methods, and operation bindings are defined in the
+OpenAPI document referenced by ``openapi_path``. Python callables
+defined in the ``routes`` module are bound to OpenAPI operations
+strictly via ``operationId``.
+
+This module contains no routing logic, request handling, or framework
+configuration beyond application assembly.
+
+Design guarantees:
+- OpenAPI is the single source of truth
+- No undocumented routes can exist
+- Every OpenAPI operationId must resolve to exactly one handler
+- All contract violations fail at application startup
+
+This file is intended to be used as the ASGI entry point.
+
+Example:
+    uvicorn main:app
+"""
+
+
 from openapi_first.app import OpenAPIFirstApp
 import routes
 

openapi_first/templates/health_app/routes.py

@@ -1,2 +1,32 @@
+"""
+OpenAPI operation handlers.
+
+This module defines pure Python callables that implement OpenAPI
+operations for this service. Functions in this module are bound to HTTP
+routes exclusively via OpenAPI ``operationId`` values.
+
+No routing decorators, HTTP metadata, or framework-specific logic
+should appear here. All request/response semantics are defined in the
+OpenAPI specification.
+
+This module serves solely as an operationId namespace.
+"""
+
+
 def get_health():
+    """
+    Health check operation handler.
+
+    This function implements the OpenAPI operation identified by
+    ``operationId: get_health``.
+
+    It contains no routing metadata or framework-specific logic.
+    Request binding, HTTP method, and response semantics are defined
+    exclusively by the OpenAPI specification.
+
+    Returns
+    -------
+    dict
+        A minimal liveness payload indicating service health.
+    """
     return {"status": "ok"}

openapi_first/templates/model_app/__init__.py

@@ -0,0 +1,102 @@
+"""
+OpenAPI-first model-based CRUD application template.
+
+This package contains a complete, minimal example of an OpenAPI-first
+CRUD service that uses explicit Pydantic domain models for request and
+response schemas.
+
+The application is assembled exclusively from:
+- an OpenAPI specification (``openapi.yaml``)
+- a handler namespace implementing CRUD operations (``routes``)
+- Pydantic domain models (``models``)
+- an in-memory mock data store (``data``)
+
+All HTTP routes, methods, schemas, and operation bindings are defined
+in the OpenAPI specification and enforced at application startup.
+No decorator-driven routing or implicit framework behavior is used.
+
+This template demonstrates:
+- operationId-driven server-side route binding
+- explicit request and response modeling with Pydantic
+- explicit HTTP status code control in handlers
+- operationId-driven client usage against the same OpenAPI contract
+- end-to-end validation using in-memory data and tests
+
+----------------------------------------------------------------------
+Scaffolding via CLI
+----------------------------------------------------------------------
+
+Create a new model-based CRUD example service using the bundled template:
+
+    openapi-first model_app
+
+Create the service in a custom directory:
+
+    openapi-first model_app my-model-service
+
+List all available application templates:
+
+    openapi-first --list
+
+The CLI copies template files verbatim into the target directory.
+No code is generated or modified beyond the copied scaffold.
+
+----------------------------------------------------------------------
+Client Usage Example
+----------------------------------------------------------------------
+
+The same OpenAPI specification used by the server can be used to
+construct a strict, operationId-driven HTTP client.
+
+Example client calls for model-based CRUD operations:
+
+    from openapi_first.loader import load_openapi
+    from openapi_first.client import OpenAPIClient
+
+    spec = load_openapi("openapi.yaml")
+    client = OpenAPIClient(spec)
+
+    # List items
+    response = client.list_items()
+
+    # Get item by ID
+    response = client.get_item(
+        path_params={"item_id": 1}
+    )
+
+    # Create item
+    response = client.create_item(
+        body={"name": "Orange", "price": 0.8}
+    )
+
+    # Update item
+    response = client.update_item(
+        path_params={"item_id": 1},
+        body={"name": "Green Apple", "price": 0.6},
+    )
+
+    # Delete item
+    response = client.delete_item(
+        path_params={"item_id": 1}
+    )
+
+Client guarantees:
+- One callable per OpenAPI ``operationId``
+- No hardcoded URLs or HTTP methods in user code
+- Request and response payloads conform to Pydantic models
+- Invalid or incomplete OpenAPI specs fail at client construction time
+
+----------------------------------------------------------------------
+Non-Goals
+----------------------------------------------------------------------
+
+This template is intentionally minimal and is NOT:
+- production-ready
+- persistent or concurrency-safe
+- a reference architecture for data storage
+
+It exists solely as a copyable example for learning, testing, and
+bootstrapping OpenAPI-first services.
+
+This package is not part of the ``openapi_first`` library API surface.
+"""

openapi_first/templates/model_app/data.py

@@ -0,0 +1,137 @@
+"""
+In-memory data store using Pydantic models.
+
+This module is NOT thread-safe and is intended for demos and scaffolds only.
+This module provides a minimal, process-local data store for the
+model-based CRUD example application. It stores and returns domain
+objects defined using Pydantic models and is intended solely for
+demonstration and scaffolding purposes.
+
+The implementation intentionally avoids:
+- persistence
+- concurrency guarantees
+- transactional semantics
+- validation beyond what Pydantic provides
+
+It is not part of the ``openapi_first`` library API surface.
+"""
+
+from typing import Dict
+
+from models import Item, ItemCreate
+
+
+# In-memory storage keyed by item ID.
+_items: Dict[int, Item] = {
+    1: Item(id=1, name="Apple", price=0.5),
+    2: Item(id=2, name="Banana", price=0.3),
+}
+
+# Auto-incrementing identifier.
+_next_id = 3
+
+
+def list_items() -> list[Item]:
+    """
+    Return all items in the data store.
+
+    Returns
+    -------
+    list[Item]
+        A list of item domain objects.
+    """
+    return list(_items.values())
+
+
+def get_item(item_id: int) -> Item:
+    """
+    Retrieve a single item by ID.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to retrieve.
+
+    Returns
+    -------
+    Item
+        The requested item.
+
+    Raises
+    ------
+    KeyError
+        If the item does not exist.
+    """
+    return _items[item_id]
+
+
+def create_item(payload: ItemCreate) -> Item:
+    """
+    Create a new item in the data store.
+
+    A new identifier is assigned automatically. No additional validation
+    is performed beyond Pydantic model validation.
+
+    Parameters
+    ----------
+    payload : ItemCreate
+        Data required to create a new item.
+
+    Returns
+    -------
+    Item
+        The newly created item.
+    """
+    global _next_id
+    item = Item(id=_next_id, **payload.model_dump())
+    _items[_next_id] = item
+    _next_id += 1
+    return item
+
+
+def update_item(item_id: int, payload: ItemCreate) -> Item:
+    """
+    Replace an existing item in the data store.
+
+    This function performs a full replacement of the stored item.
+    Partial updates are not supported.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to update.
+    payload : ItemCreate
+        New item data.
+
+    Returns
+    -------
+    Item
+        The updated item.
+
+    Raises
+    ------
+    KeyError
+        If the item does not exist.
+    """
+    if item_id not in _items:
+        raise KeyError(item_id)
+    item = Item(id=item_id, **payload.model_dump())
+    _items[item_id] = item
+    return item
+
+
+def delete_item(item_id: int) -> None:
+    """
+    Remove an item from the data store.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to delete.
+
+    Raises
+    ------
+    KeyError
+        If the item does not exist.
+    """
+    del _items[item_id]

openapi_first/templates/model_app/main.py

@@ -0,0 +1,35 @@
+"""
+Application entry point for an OpenAPI-first model-based CRUD example service.
+
+This module constructs a FastAPI application exclusively from an
+OpenAPI specification and a handler namespace, without using
+decorator-driven routing.
+
+All HTTP routes, methods, request/response schemas, and operation
+bindings are defined in the OpenAPI document referenced by
+``openapi_path``. Python callables defined in the ``routes`` module are
+bound to OpenAPI operations strictly via ``operationId``.
+
+This module contains no routing logic, persistence concerns, or
+framework configuration beyond application assembly.
+
+Design guarantees:
+- OpenAPI is the single source of truth
+- No undocumented routes can exist
+- Every OpenAPI operationId must resolve to exactly one handler
+- All contract violations fail at application startup
+
+This file is intended to be used as the ASGI entry point.
+
+Example:
+    uvicorn main:app
+"""
+
+from openapi_first.app import OpenAPIFirstApp
+import routes
+
+app = OpenAPIFirstApp(
+    openapi_path="openapi.yaml",
+    routes_module=routes,
+    title="Model CRUD Example Service",
+)

openapi_first/templates/model_app/models.py

@@ -0,0 +1,50 @@
+"""
+Pydantic domain models for the CRUD example.
+
+This module defines Pydantic models that represent the domain entities
+used by the service. These models are referenced by the OpenAPI
+specification for request and response schemas.
+
+The models are declarative and framework-agnostic. They contain no
+persistence logic, validation beyond type constraints, or business
+behavior.
+
+This module is not part of the ``openapi_first`` library API surface.
+It exists solely to support the example application template.
+"""
+
+from pydantic import BaseModel
+
+
+class ItemBase(BaseModel):
+    """
+    Base domain model for an item.
+
+    Defines fields common to all item representations.
+    """
+
+    name: str
+    price: float
+
+
+class ItemCreate(ItemBase):
+    """
+    Domain model for item creation requests.
+
+    This model is used for request bodies when creating new items.
+    It intentionally excludes the ``id`` field, which is assigned
+    by the service.
+    """
+
+    pass
+
+
+class Item(ItemBase):
+    """
+    Domain model for a persisted item.
+
+    This model represents the full item state returned in responses,
+    including the server-assigned identifier.
+    """
+
+    id: int

openapi_first/templates/model_app/openapi.yaml

@@ -0,0 +1,116 @@
+openapi: 3.0.3
+info:
+  title: Model CRUD Example Service
+  version: "1.0.0"
+  description: OpenAPI-first CRUD service with Pydantic models.
+
+paths:
+  /items:
+    get:
+      operationId: list_items
+      responses:
+        "200":
+          description: List of items
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/Item"
+
+    post:
+      operationId: create_item
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ItemCreate"
+      responses:
+        "201":
+          description: Item created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+
+  /items/{item_id}:
+    get:
+      operationId: get_item
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "200":
+          description: Item found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+        "404":
+          description: Item not found
+
+    put:
+      operationId: update_item
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ItemCreate"
+      responses:
+        "200":
+          description: Item updated
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Item"
+        "404":
+          description: Item not found
+
+    delete:
+      operationId: delete_item
+      parameters:
+        - name: item_id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "204":
+          description: Item deleted
+        "404":
+          description: Item not found
+
+components:
+  schemas:
+    Item:
+      type: object
+      required: [id, name, price]
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        price:
+          type: number
+          format: float
+
+    ItemCreate:
+      type: object
+      required: [name, price]
+      properties:
+        name:
+          type: string
+        price:
+          type: number
+          format: float

openapi_first/templates/model_app/routes.py

@@ -0,0 +1,156 @@
+"""
+CRUD route handlers bound via OpenAPI operationId.
+
+This module defines OpenAPI-bound operation handlers for a model-based
+CRUD service. Functions in this module are bound to HTTP routes
+exclusively via OpenAPI ``operationId`` values.
+
+Handlers explicitly control HTTP response status codes to ensure runtime
+behavior matches the OpenAPI contract. Domain models defined using
+Pydantic are used for request and response payloads.
+
+No routing decorators, path definitions, or implicit framework behavior
+appear in this module. All routing, HTTP methods, and schemas are defined
+in the OpenAPI specification.
+"""
+
+from fastapi import Response, HTTPException
+
+from models import ItemCreate
+from data import (
+    list_items as _list_items,
+    get_item as _get_item,
+    create_item as _create_item,
+    update_item as _update_item,
+    delete_item as _delete_item,
+)
+
+
+def list_items():
+    """
+    List all items.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: list_items``.
+
+    Returns
+    -------
+    list[Item]
+        A list of item domain objects.
+    """
+    return _list_items()
+
+
+def get_item(item_id: int):
+    """
+    Retrieve a single item by ID.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: get_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to retrieve.
+
+    Returns
+    -------
+    Item
+        The requested item.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        return _get_item(item_id)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+
+def create_item(payload: ItemCreate, response: Response):
+    """
+    Create a new item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: create_item``.
+
+    Parameters
+    ----------
+    payload : ItemCreate
+        Request body describing the item to create.
+    response : fastapi.Response
+        Response object used to set the HTTP status code.
+
+    Returns
+    -------
+    Item
+        The newly created item.
+    """
+    item = _create_item(payload)
+    response.status_code = 201
+    return item
+
+
+def update_item(item_id: int, payload: ItemCreate):
+    """
+    Update an existing item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: update_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to update.
+    payload : ItemCreate
+        New item data.
+
+    Returns
+    -------
+    Item
+        The updated item.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        return _update_item(item_id, payload)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+
+def delete_item(item_id: int, response: Response):
+    """
+    Delete an existing item.
+
+    Implements the OpenAPI operation identified by
+    ``operationId: delete_item``.
+
+    Parameters
+    ----------
+    item_id : int
+        Identifier of the item to delete.
+    response : fastapi.Response
+        Response object used to set the HTTP status code.
+
+    Returns
+    -------
+    None
+        No content.
+
+    Raises
+    ------
+    HTTPException
+        404 if the item does not exist.
+    """
+    try:
+        _delete_item(item_id)
+    except KeyError:
+        raise HTTPException(status_code=404, detail="Item not found")
+
+    response.status_code = 204
+    return None

openapi_first/templates/model_app/test_model_app.py

@@ -0,0 +1,124 @@
+"""
+End-to-end tests for the OpenAPI-first model CRUD example app.
+
+These tests validate that all CRUD operations behave correctly
+against the in-memory mock data store using Pydantic models.
+- OpenAPI specification loading
+- OperationId-driven route binding on the server
+- OperationId-driven client invocation
+- Pydantic model-based request and response handling
+
+All CRUD operations are exercised against an in-memory mock data store
+backed by Pydantic domain models.
+
+The tests assume:
+- OpenAPI-first route binding
+- Pydantic model validation
+- In-memory storage (no persistence guarantees)
+- Deterministic behavior in a single process
+"""
+
+from fastapi.testclient import TestClient
+
+from main import app
+from openapi_first.loader import load_openapi
+from openapi_first.client import OpenAPIClient
+
+
+client = TestClient(app)
+spec = load_openapi("openapi.yaml")
+client = OpenAPIClient(
+    spec=spec,
+    base_url="http://testserver",
+    client=client,
+)
+
+
+def test_list_items_initial():
+    """Initial items should be present."""
+    response = client.list_items()
+    assert response.status_code == 200
+
+    data = response.json()
+    assert isinstance(data, list)
+    assert len(data) >= 2
+
+    ids = {item["id"] for item in data}
+    assert 1 in ids
+    assert 2 in ids
+
+
+def test_get_item():
+    """Existing item should be retrievable by ID."""
+    response = client.get_item(
+        path_params={"item_id": 1}
+    )
+    assert response.status_code == 200
+
+    item = response.json()
+    assert item["id"] == 1
+    assert isinstance(item["name"], str)
+    assert isinstance(item["price"], float)
+
+
+def test_create_item():
+    """Creating a new item should return the created entity."""
+    payload = {
+        "name": "Orange",
+        "price": 0.8,
+    }
+
+    response = client.create_item(
+        body=payload
+    )
+    assert response.status_code == 201
+
+    item = response.json()
+    assert "id" in item
+    assert item["name"] == payload["name"]
+    assert item["price"] == payload["price"]
+
+    # Verify it appears in list
+    list_response = client.list_items()
+    ids = {i["id"] for i in list_response.json()}
+    assert item["id"] in ids
+
+
+def test_update_item():
+    """Updating an item should replace its values."""
+    payload = {
+        "name": "Green Apple",
+        "price": 0.6,
+    }
+
+    response = client.update_item(
+        path_params={"item_id": 1},
+        body=payload,
+    )
+    assert response.status_code == 200
+
+    item = response.json()
+    assert item["id"] == 1
+    assert item["name"] == payload["name"]
+    assert item["price"] == payload["price"]
+
+    # Verify persisted update
+    get_response = client.get_item(
+        path_params={"item_id": 1}
+    )
+    updated = get_response.json()
+    assert updated["name"] == payload["name"]
+    assert updated["price"] == payload["price"]
+
+
+def test_delete_item():
+    """Deleting an item should remove it from the store."""
+    response = client.delete_item(
+        path_params={"item_id": 2}
+    )
+    assert response.status_code == 204
+
+    # Verify deletion
+    list_response = client.list_items()
+    ids = {item["id"] for item in list_response.json()}
+    assert 2 not in ids

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "openapi-first"
-version = "0.0.1"
+version = "0.0.4"
 description = "Strict OpenAPI-first application bootstrap for FastAPI."
 readme = "README.md"
 requires-python = ">=3.10"
@@ -84,7 +84,7 @@ Versions = "https://git.aetoskia.com/aetos/openapi-first/tags"
 packages = { find = { include = ["openapi_first*"] } }
 
 [tool.setuptools.package-data]
-fastapi_openapi_first = ["templates/**/*"]
+openapi_first = ["templates/**/*"]
 
 
 [tool.ruff]

requirements.txt

@@ -1,17 +0,0 @@
-fastapi==0.128.0,
-openapi-spec-validator==0.7.2,
-pyyaml==6.0.3,
-uvicorn==0.40.0
-
-# Test Packages
-pytest==7.4.0
-pytest-asyncio==0.21.0
-pytest-cov==4.1.0
-
-# Doc Packages
-mkdocs==1.6.1
-mkdocs-material==9.6.23
-neoteroi-mkdocs==1.1.3
-pymdown-extensions==10.16.1
-mkdocstrings==1.0.0
-mkdocstrings-python==2.0.1