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How many tools should an MCP server expose? A 5-to-100 benchmark

This story is from 2026-10-30. It is preserved in the archive; the latest stories are on the live feed.

Every MCP server I've built followed the same curve: one tool, then three, then a dozen, and at some point the model quietly started calling the wrong one. The standard advice is "expose fewer tools", which is useless until you know what fewer means in practice. So I turned the tool count into an e…

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  1. 2026-10-30 10:09 · DEV Community — AI
    How many tools should an MCP server expose? A 5-to-100 benchmark

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