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Debug MCP Server Connection and Tool-Call Failures

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AI & Agents intermediate 8 min read $0.01 Updated 2026-10-19

Layer-by-layer diagnosis of Model Context Protocol failures: stdio and HTTP transport problems, stdout pollution, the initialize handshake, tools/list schema errors, tool-call error handling, timeouts and how to test a server with the MCP inspector.

The MCP server will not connect, lists no tools, or a tool call returns an error the model cannot use. Find which layer failed: transport, initialize handshake, tool schema or the tool itself.

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#mcp#tools#debugging#json-rpc#stdio

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