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Postmortem: Context Compaction Dropped the Migration Guardrail

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

The agent did not ignore the migration guardrail that night. Context compaction removed the rule from the live prompt. A later apply then rewrote a frozen schema file. Incident summary A shared coding agent ran on a free server queue. The operator pinned one rule in the system prompt. Schema migrat…

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  1. 2026-09-06 21:48 · DEV Community — AI
    Postmortem: Context Compaction Dropped the Migration Guardrail

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