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append-run-log

Use when a completed agent run must be recorded as durable, queryable evidence. Not for remote, credential, publish, deploy, or irreversible changes.

.devin/skills/append-run-log/SKILL.md

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# Append run log

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A completed agent run must be recorded as durable, queryable evidence. |
| Authority | Reversible local: writes the run log, last-run pointer, and a same-directory temporary file during retention compaction; without retention it appends, and with retention it atomically removes expired entries while preserving retained lines byte-for-byte. Rollback is version control. No remote mutation. |
| Side effect | Appends one entry to the JSONL run log under an ISO-only date guard; when retention_window is supplied, atomically compacts away expired entries while preserving retained lines byte-for-byte, then updates the last-run pointer. |
| Done | Exactly one entry exists per run with a unique run id, malformed lines are ignored rather than corrupting the log, and aggregate metrics are derivable from the log alone. |

## Inputs

- `run_id`: must be supplied, non-empty, and unique within the log.