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Four MCP servers connected, and the agent suddenly fumbles tool choices it used to get right.
What you'll have at the end
Your server's tool count and connect-time token cost, both cut using a lookup-first tool instead of the full list
You need
An MCP server you already run that registers more than a handful of real tools directly, each one already working correctly on its own.
Not covered
Picking which tools your server should offer in the first place, or fixing one single tool a model still misses by name even with only a few registered.
Leans on
Rename an MCP tool the model ignores
when a model misses one tool by name even though only a handful are registered, no lookup layer needed, just a clearer name and description.
Ship your first real MCP server
for the first working server with its own real tools, which this recipe assumes you already have running.
Checked 15 Aug 2026
Part of the MCP Servers Implementation cookbook