Rewrite the tool error `Error 422: invalid request` so that an agent can recover from it in a single step, and explain what makes your version better.

University of Michigan - Ann Arbor

A tool that returns 'Error 422' teaches the agent nothing. A tool that returns 'since must be an ISO-8601 date; you passed "last week"' turns a dead end into a one-step correction, and is the single highest-leverage change to most tool surfaces.

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