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How to Test and Debug an MCP Server: From the Inspector to Automated Tool Tests

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Testing an MCP server through an AI client is a slow way to work. You type a natural-language prompt, hope the model picks the right tool, watch it fill in arguments, and if anything fails you cannot tell whether the bug is in your server, the model's reasoning, or the prompt. Every layer of that stack is nondeterministic except yours. Test yours first, deterministically, and leave the AI out of it until the protocol surface is provably correct. The protocol makes this easy.

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