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Nested Agent Failures Hide in Flat Logs. Build a Span Tree.

This story is from 2026-09-05. It is preserved in the archive; the latest stories are on the live feed.

A checkout agent passed every unit test. Production still dropped the refund. Ops pasted a 400-line tool log. Every call returned HTTP 200. Two write_order events sat back to back. Neither row named a parent span. A retry had spawned a nested planner. That planner spawned a second writer. Flat logs…

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  1. 2026-09-05 19:45 · DEV Community — AI
    Nested Agent Failures Hide in Flat Logs. Build a Span Tree.

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