PRODUCTION SCENARIO
A developer wants the Messages API MCP connector to talk to a local stdio MCP server running on a laptop, and also to read that server's resources and prompts.
Which limitation of the MCP connector blocks this plan?
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Answer: It supports only tool calls, over publicly reachable HTTP servers
The connector's two documented limitations are that only tool calls from the MCP feature set are supported, and that the server must be publicly exposed over HTTP, so a local stdio server cannot be connected at all. An authorization_token authenticates an HTTP server; it cannot reach a subprocess on a laptop, and no beta header changes that either. The last option has the feature set backwards. For local servers, prompts or resources, the docs point to the SDKs' client-side MCP helpers instead.
Official Source: https://platform.claude.com/docs/en/agents-and-tools/mcp-connector ↗