diff --git a/manage_docs.py b/manage_docs.py
new file mode 100644
index 0000000..e9670ec
--- /dev/null
+++ b/manage_docs.py
@@ -0,0 +1,152 @@
+"""
+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
+import sys
+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 = "mail_intake"
+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
+    - Overwrites content with ::: package.module
+
+    Example:
+        mail_intake/config.py        -> docs/mail_intake/config.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"):
+        if py_file.name == "__init__.py":
+            continue
+
+        rel = py_file.relative_to(project_root)
+        md_path = docs_root / rel.with_suffix(".md")
+
+        md_path.parent.mkdir(parents=True, exist_ok=True)
+
+        module_path = ".".join(rel.with_suffix("").parts)
+        title = md_path.stem.replace("_", " ").title()
+
+        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:
+    config = load_mkdocs_config()
+    mkdocs_serve.serve(config)
+
+
+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()