AINewsnow

One tools/list call cost 529 KB

November 2026 MCP clients do not ship a catalogue to the model once and cache it. They ask the server for tools/list , and whatever comes back is what the model gets to see — every session, as part of its context. For a server with a dozen tools that is a few kilobytes and nobody thinks about it. F…

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  1. 2026-11-11 07:52 · DEV Community — AI
    One tools/list call cost 529 KB

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