The /mcp route built its Request without a signal, so a tool kept working
after the client left. The request's signal now aborts when the connection
closes before the answer is sent.
Mount the local MCP server at /mcp on the development and preview
servers for clients that connect by URL. The route accepts only
requests from this machine that name a loopback host and, when an
Origin is sent, come from a loopback origin, and drains oversized
bodies so the 413 response is delivered. The provider-order regression
test now pins the route between the providers and the API fallback.
Sameh Khamis