PRODUCTION SCENARIO
A developer wants the Messages API MCP connector to talk to a local stdio MCP server on a laptop and also read the server's resources and prompts.
What stops this plan from working?
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Answer: The connector supports only tool calls over publicly reachable HTTP servers
The MCP connector page lists two limitations: only tool calls from the MCP feature set are supported, and the server must be publicly exposed through HTTP, so local stdio servers cannot be connected directly. The docs point to the SDK client-side MCP helpers for local servers, prompts, and resources.
Official Source: https://platform.claude.com/docs/en/agents-and-tools/mcp-connector ↗