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Log Where Each Tool Argument Came From

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

The calendar tool returned HTTP 200 without errors. The invite still landed at 09:00 UTC. The user sat in Tokyo that same morning. Nobody typed a timezone into the prompt. The model sent timezone UTC on its own. The JSON trace file only named the tool. It did not name the source of that field. This…

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  1. 2026-09-04 06:29 · DEV Community — AI
    Log Where Each Tool Argument Came From

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