Add story-style examples suite (27 stories + harness + CI) (#2957)

src/mcp/server/elicitation.py

@@ -113,7 +113,7 @@ async def elicit_with_validation(
         return AcceptedElicitation(data=validated_data)
     elif result.action == "decline":
         return DeclinedElicitation()
-    elif result.action == "cancel":  # pragma: no cover
+    elif result.action == "cancel":
         return CancelledElicitation()
     else:  # pragma: no cover
         # This should never happen, but handle it just in case

src/mcp/server/lowlevel/server.py

@@ -561,7 +561,7 @@ class Server(Generic[LifespanResultT]):
                 )
             )
 
-        if custom_starlette_routes:  # pragma: no cover
+        if custom_starlette_routes:
             routes.extend(custom_starlette_routes)
 
         return Starlette(

src/mcp/server/mcpserver/server.py

@@ -200,7 +200,7 @@ class MCPServer(Generic[LifespanResultT]):
         self._token_verifier = token_verifier
 
         # Create token verifier from provider if needed (backwards compatibility)
-        if auth_server_provider and not token_verifier:  # pragma: no cover
+        if auth_server_provider and not token_verifier:
             self._token_verifier = ProviderTokenVerifier(auth_server_provider)
         self._custom_starlette_routes: list[Route] = []
 
@@ -822,7 +822,7 @@ class MCPServer(Generic[LifespanResultT]):
             ```
         """
 
-        def decorator(  # pragma: no cover
+        def decorator(
             func: Callable[[Request], Awaitable[Response]],
         ) -> Callable[[Request], Awaitable[Response]]:
             self._custom_starlette_routes.append(
@@ -830,7 +830,7 @@ class MCPServer(Generic[LifespanResultT]):
             )
             return func
 
-        return decorator  # pragma: no cover
+        return decorator
 
     async def run_stdio_async(self) -> None:
         """Run the server using stdio transport."""

src/mcp/shared/exceptions.py

@@ -38,7 +38,7 @@ class MCPError(Exception):
 
     @property
     def data(self) -> Any:
-        return self.error.data  # pragma: no cover
+        return self.error.data
 
     @classmethod
     def from_jsonrpc_error(cls, error: JSONRPCError) -> MCPError: