chore: add D212 lint rule to enforce Google-style docstrings (#1892)

examples/servers/simple-auth/mcp_simple_auth/auth_server.py

@@ -1,5 +1,4 @@
-"""
-Authorization Server for MCP Split Demo.
+"""Authorization Server for MCP Split Demo.
 
 This server handles OAuth flows, client registration, and token issuance.
 Can be replaced with enterprise authorization servers like Auth0, Entra ID, etc.
@@ -41,8 +40,7 @@ class AuthServerSettings(BaseModel):
 
 
 class SimpleAuthProvider(SimpleOAuthProvider):
-    """
-    Authorization Server provider with simple demo authentication.
+    """Authorization Server provider with simple demo authentication.
 
     This provider:
     1. Issues MCP tokens after simple credential authentication
@@ -98,8 +96,7 @@ def create_authorization_server(server_settings: AuthServerSettings, auth_settin
 
     # Add token introspection endpoint (RFC 7662) for Resource Servers
     async def introspect_handler(request: Request) -> Response:
-        """
-        Token introspection endpoint for Resource Servers.
+        """Token introspection endpoint for Resource Servers.
 
         Resource Servers call this endpoint to validate tokens without
         needing direct access to token storage.
@@ -157,8 +154,7 @@ async def run_server(server_settings: AuthServerSettings, auth_settings: SimpleA
 @click.command()
 @click.option("--port", default=9000, help="Port to listen on")
 def main(port: int) -> int:
-    """
-    Run the MCP Authorization Server.
+    """Run the MCP Authorization Server.
 
     This server handles OAuth flows and can be used by multiple Resource Servers.
 

examples/servers/simple-auth/mcp_simple_auth/legacy_as_server.py

@@ -1,5 +1,4 @@
-"""
-Legacy Combined Authorization Server + Resource Server for MCP.
+"""Legacy Combined Authorization Server + Resource Server for MCP.
 
 This server implements the old spec where MCP servers could act as both AS and RS.
 Used for backwards compatibility testing with the new split AS/RS architecture.
@@ -87,8 +86,7 @@ def create_simple_mcp_server(server_settings: ServerSettings, auth_settings: Sim
 
     @app.tool()
     async def get_time() -> dict[str, Any]:
-        """
-        Get the current server time.
+        """Get the current server time.
 
         This tool demonstrates that system information can be protected
         by OAuth authentication. User must be authenticated to access it.

examples/servers/simple-auth/mcp_simple_auth/server.py

@@ -1,5 +1,4 @@
-"""
-MCP Resource Server with Token Introspection.
+"""MCP Resource Server with Token Introspection.
 
 This server validates tokens via Authorization Server introspection and serves MCP resources.
 Demonstrates RFC 9728 Protected Resource Metadata for AS/RS separation.
@@ -47,8 +46,7 @@ class ResourceServerSettings(BaseSettings):
 
 
 def create_resource_server(settings: ResourceServerSettings) -> FastMCP:
-    """
-    Create MCP Resource Server with token introspection.
+    """Create MCP Resource Server with token introspection.
 
     This server:
     1. Provides protected resource metadata (RFC 9728)
@@ -80,8 +78,7 @@ def create_resource_server(settings: ResourceServerSettings) -> FastMCP:
 
     @app.tool()
     async def get_time() -> dict[str, Any]:
-        """
-        Get the current server time.
+        """Get the current server time.
 
         This tool demonstrates that system information can be protected
         by OAuth authentication. User must be authenticated to access it.
@@ -114,8 +111,7 @@ def create_resource_server(settings: ResourceServerSettings) -> FastMCP:
     help="Enable RFC 8707 resource validation",
 )
 def main(port: int, auth_server: str, transport: Literal["sse", "streamable-http"], oauth_strict: bool) -> int:
-    """
-    Run the MCP Resource Server.
+    """Run the MCP Resource Server.
 
     This server:
     - Provides RFC 9728 Protected Resource Metadata

examples/servers/simple-auth/mcp_simple_auth/simple_auth_provider.py

@@ -1,5 +1,4 @@
-"""
-Simple OAuth provider for MCP servers.
+"""Simple OAuth provider for MCP servers.
 
 This module contains a basic OAuth implementation using hardcoded user credentials
 for demonstration purposes. No external authentication provider is required.
@@ -47,8 +46,7 @@ class SimpleAuthSettings(BaseSettings):
 
 
 class SimpleOAuthProvider(OAuthAuthorizationServerProvider[AuthorizationCode, RefreshToken, AccessToken]):
-    """
-    Simple OAuth provider for demo purposes.
+    """Simple OAuth provider for demo purposes.
 
     This provider handles the OAuth flow by:
     1. Providing a simple login form for demo credentials