Agent skill
idempotent-redundancy
Idempotent Redundancy
Install this agent skill to your Project
npx add-skill https://github.com/vibeeval/vibecosystem/tree/main/skills/idempotent-redundancy
SKILL.md
Idempotent Redundancy
When adding redundant paths (fallbacks, belt-and-suspenders), make them idempotent.
Pattern
Redundancy without idempotency causes loops, churn, or data corruption.
DO
- Use
_is_merge: truefor Braintrust updates - Check if value exists before writing (fallback only if missing)
- Use atomic write/rename for file operations
- Make reconciliation steps safe to run repeatedly
DON'T
- Write unconditionally in fallback paths
- Allow multiple writers to overwrite each other
- Fire "repair" actions that can trigger more repairs
Source Sessions
- a541f08a: "Redundancy is good only if idempotent"
- 1c21e6c8: "Belt-and-suspenders, but make it idempotent"
- 6a9f2d7a: "Idempotent repair hooks"
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