added mcp server code

docforge/cli/main.py

@@ -192,6 +192,40 @@ def build(mkdocs_yml: Path) -> None:
     click.echo("MkDocs build completed")
 
 
+# ---------------------------------------------------------------------
+# serve-mcp
+# ---------------------------------------------------------------------
+
+@cli.command(name="serve-mcp")
+def serve_mcp() -> None:
+    """
+    Serve MCP documentation from the local mcp_docs directory.
+    """
+    from docforge.servers import MCPServer
+
+    mcp_root = Path.cwd() / "mcp_docs"
+
+    if not mcp_root.exists():
+        raise click.ClickException("mcp_docs directory not found")
+
+    required = [
+        mcp_root / "index.json",
+        mcp_root / "nav.json",
+        mcp_root / "modules",
+    ]
+
+    for path in required:
+        if not path.exists():
+            raise click.ClickException(f"Invalid MCP bundle, missing: {path.name}")
+
+    server = MCPServer(
+        mcp_root=mcp_root,
+        name="doc-forge-mcp",
+    )
+
+    server.run()
+
+
 # ---------------------------------------------------------------------
 # serve
 # ---------------------------------------------------------------------

docforge/servers/__init__.py

@@ -0,0 +1,5 @@
+from .mcp_server import MCPServer
+
+__all__ = [
+    "MCPServer",
+]

docforge/servers/mcp_server.py

@@ -0,0 +1,73 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any, Literal
+
+from mcp.server.fastmcp import FastMCP
+
+
+class MCPServer:
+    """
+    MCP server for serving a pre-built MCP documentation bundle.
+    """
+
+    def __init__(self, mcp_root: Path, name: str) -> None:
+        self.mcp_root = mcp_root
+        self.app = FastMCP(name)
+
+        self._register_resources()
+        self._register_tools()
+
+    # ------------------------------------------------------------------
+    # Internal helpers
+    # ------------------------------------------------------------------
+
+    def _read_json(self, path: Path) -> Any:
+        if not path.exists():
+            return {
+                "error": "not_found",
+                "path": str(path),
+            }
+        return json.loads(path.read_text(encoding="utf-8"))
+
+    # ------------------------------------------------------------------
+    # MCP resources
+    # ------------------------------------------------------------------
+
+    def _register_resources(self) -> None:
+        @self.app.resource("docs://index")
+        def index():
+            return self._read_json(self.mcp_root / "index.json")
+
+        @self.app.resource("docs://nav")
+        def nav():
+            return self._read_json(self.mcp_root / "nav.json")
+
+        @self.app.resource("docs://module/{module}")
+        def module(module: str):
+            return self._read_json(
+                self.mcp_root / "modules" / f"{module}.json"
+            )
+
+    # ------------------------------------------------------------------
+    # MCP tools (optional / diagnostic)
+    # ------------------------------------------------------------------
+
+    def _register_tools(self) -> None:
+        @self.app.tool()
+        def ping() -> str:
+            return "pong"
+
+    # ------------------------------------------------------------------
+    # Server lifecycle
+    # ------------------------------------------------------------------
+
+    def run(self, transport: Literal["stdio", "sse", "streamable-http"] = "streamable-http") -> None:
+        """
+        Start the MCP server.
+
+        Args:
+            transport: MCP transport (default: streamable-http)
+        """
+        self.app.run(transport=transport)

tests/cli/conftest.py

@@ -1,7 +1,7 @@
-from pathlib import Path
-from typing import Callable
-
+import json
 import pytest
+from pathlib import Path
+
 from click.testing import CliRunner
 
 
@@ -65,3 +65,47 @@ def mock_mkdocs_serve(monkeypatch):
         fake_serve,
     )
     return lambda: called["value"]
+
+@pytest.fixture
+def fake_mcp_docs(tmp_path: Path) -> Path:
+    """
+    Create a minimal valid MCP bundle in mcp_docs/.
+    """
+    mcp_root = tmp_path / "mcp_docs"
+    modules_dir = mcp_root / "modules"
+    modules_dir.mkdir(parents=True)
+
+    (mcp_root / "index.json").write_text(
+        json.dumps({"project": "test", "type": "docforge-model"}),
+        encoding="utf-8",
+    )
+
+    (mcp_root / "nav.json").write_text(
+        json.dumps([]),
+        encoding="utf-8",
+    )
+
+    (modules_dir / "test.mod.json").write_text(
+        json.dumps({"module": "test.mod", "content": {}}),
+        encoding="utf-8",
+    )
+
+    return mcp_root
+
+
+@pytest.fixture
+def mock_mcp_server_run(monkeypatch):
+    """
+    Mock MCPServer.run so no real server is started.
+    """
+    called = {"value": False}
+
+    def fake_run(self, transport="streamable-http"):
+        called["value"] = True
+
+    monkeypatch.setattr(
+        "docforge.servers.MCPServer.run",
+        fake_run,
+    )
+
+    return lambda: called["value"]

tests/cli/test_mcp_serve.py

@@ -0,0 +1,18 @@
+from docforge.cli.main import cli
+
+
+def test_serve_mcp(
+    cli_runner,
+    fake_mcp_docs,
+    mock_mcp_server_run,
+    monkeypatch,
+):
+    monkeypatch.chdir(fake_mcp_docs.parent)
+
+    result = cli_runner.invoke(
+        cli,
+        ["serve-mcp"],
+    )
+
+    assert result.exit_code == 0
+    assert mock_mcp_server_run()