We found 331 MCP tool-list changes in one week that only moved a date. Each one costs a prompt-cache write
A reader of our last post, Paul Irolla, who builds a token optimizer for coding agents, pointed out something we had only looked at as a correctness problem. A model request starts with the tool list. Change one byte of a tool definition and every prompt cache built on that request is gone, even if…
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- 2026-11-03 03:00 · DEV Community — AI
We found 331 MCP tool-list changes in one week that only moved a date. Each one costs a prompt-cache write