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How many tools should an MCP server have? I measured 5 to 100 in Claude Code, Codex and Gemini

This story is from 2026-10-14. It is preserved in the archive; the latest stories are on the live feed.

Most advice about MCP server design says keep the tool count small. I read 91 sources: 38 say design fewer tools, 20 give a number (mostly 10–20), and only 10 measured tool count against accuracy at all. Then I measured it: 1,932 runs, three clients, 5 to 100 tools. On today's top models accuracy d…

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  1. 2026-10-14 19:54 · DEV Community — AI
    How many tools should an MCP server have? I measured 5 to 100 in Claude Code, Codex and Gemini

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