principle-make-operations-idempotent SKILL.md skillA

This file is byte-identical to the first copy the registry indexed, one of 5 indexed copies. Same content hash, so the same checks give both the same grade.

principle-make-operations-idempotent from barbieri/local-openfinance is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add barbieri/local-openfinance/principle-make-operations-idempotent@git:20260909.1e5ab42

Pins git:20260909.1e5ab42 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

barbieri/local-openfinance

Path

.agents/skills/principle-make-operations-idempotent/SKILL.md

Versions recorded

1

Latest version

git:20260909.1e5ab42, committed Sep 9, 2026

Size

1,390 bytes

Repository stars

24

License

GPL-3.0

Apply when designing commands, lifecycle steps, or processing loops that run amid crashes, restarts, and retries. Converge to the same end state regardless of partial prior runs.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Make Operations Idempotent

Design operations so they converge to the correct state regardless of how many times they run or where they start from. Every state-mutating operation should answer: "What happens if this runs twice? What happens if the previous run crashed halfway?"

**Why:** Commands, lifecycle operations, and processing loops run where crashes, restarts, and retries are normal. If partial state changes the next run's outcome, every restart becomes a debugging session.

**The pattern:**
- Convergent startup: scan for existing state, clean stale artifacts, adopt live sessions
- Content-based cleanup: compare by content equivalence, not creation order
- Self-healing locks: use PID-based stale lock detection
- Idempotent scheduling: failed work respawns cleanly, fresh input regenerated after each cycle

**The test:**
1. What happens if this runs twice in a row?
2. What happens if the previous run crashed at every possible point?
3. Does re-execution converge to the same end state?

If any answer is "it depends on what state was left behind," the operation needs a reconciliation step.

Read the whole file at its exact version.

How to install

mdr add barbieri/local-openfinance/principle-make-operations-idempotent@sha256:540738217c3da7bf

[![mdr](https://markdownregistry.com/badge/art_vij2myhuccfltgi7.svg)](https://markdownregistry.com/a/art_vij2myhuccfltgi7)

Versions

The registry has recorded 1 version of this file, committed on Sep 9, 2026.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_vij2myhuccfltgi7
GET https://markdownregistry.com/api/v1/resolve?ref=barbieri/local-openfinance/principle-make-operations-idempotent
GET https://markdownregistry.com/api/v1/blob/540738217c3da7bf513b9886924ad6a2bc77e58be867f5bd2e1831c74bf2ce70

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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