Agent skill

history-hygiene

Record final outcomes to history.md, not intermediate requests or reversed decisions

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Install this agent skill to your Project

npx add-skill https://github.com/sbroenne/pytest-skill-engineering/tree/main/.copilot/skills/history-hygiene

SKILL.md

Context

History files (.md files tracking decisions, spawns, outcomes) are read cold by future agents. Stale or incorrect entries poison decision-making downstream. The Kobayashi incident proved this: history said "Brady decided v0.6.0" when Brady had reversed that to v0.8.17. Future spawns read the wrong truth and repeated the mistake.

Patterns

  • Record the final outcome, not the initial request.
  • Wait for confirmation before writing to history — don't log intermediate states.
  • If a decision reverses, update the entry immediately — don't leave stale data.
  • One read = one truth. A future agent should never need to cross-reference other files to understand what actually happened.

Examples

Correct:

  • "Migration target: v0.8.17 (initially discussed as v0.6.0, corrected by Brady)"
  • "Reverted to Node 18 per Brady's explicit request on 2024-01-15"

Incorrect:

  • "Brady directed v0.6.0" (when later reversed)
  • Recording what was requested instead of what actually happened
  • Logging entries before outcome is confirmed

Anti-Patterns

  • Writing intermediate or "for now" states to disk
  • Attributing decisions without confirming final direction
  • Treating history like a draft — history is the source of truth
  • Assuming readers will cross-reference or verify; they won't

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