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Idempotency Keys

Agent skill
1 skill
READMEOverview ↓

Makes operations safe to repeat so retries and at-least-once delivery don't double-charge or double-create — idempotency by design first (PUT/upsert, conditional writes with version/ETag/If-Match, natural deterministic keys, set-don't-increment) and by key second (client Idempotency-Key header, a dedup table keyed unique on the key that stores request fingerprint + status + response and replays the SAME response, 409 in-progress lock for concurrent duplicates, 422 on key-reuse-with-different-body), plus consumer-side dedup (processed-event-id store / dedup window), the outbox pattern for atomic write+publish, and DB mechanics (ON CONFLICT, SELECT FOR UPDATE / advisory locks). Effectively-once via dedup, because exactly-once delivery is a myth.

Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI

Supported by the Atlas install prompt. Skill-specific requirements vary.

Skill stats

Skills1CategoryGeneralStars0

About this skill

Makes operations safe to repeat so retries and at-least-once delivery don't double-charge or double-create — idempotency by design first (PUT/upsert, conditional writes with version/ETag/If-Match, natural deterministic keys, set-don't-increment) and by key second (client Idempotency-Key header, a dedup table keyed unique on the key that stores request fingerprint + status + response and replays the SAME response, 409 in-progress lock for concurrent duplicates, 422 on key-reuse-with-different-body), plus consumer-side dedup (processed-event-id store / dedup window), the outbox pattern for atomic write+publish, and DB mechanics (ON CONFLICT, SELECT FOR UPDATE / advisory locks). Effectively-once via dedup, because exactly-once delivery is a myth.

Quick start

  1. Copy the install prompt. Use the green button above this README.
  2. Send it to your agent. Paste it into your coding agent’s chat and send.
  3. Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.

Installation guide →

Review, license & listing details
Review the source before using this skill

This is an imported listing. We haven’t certified its safety, license, or compatibility. Skills may include executable scripts.

Automated security scan: Partial

Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.

0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1

Content SHA-256: 1fc996fb0310bc3b1d4490f15f50c04e44b9e55c56c9c48469e693cce3395821

About scan coverage and limitations
Original listing metadata

Original name

idempotency-keys

Original description

Makes operations safe to repeat so retries and at-least-once delivery don't double-charge or double-create — idempotency by design first (PUT/upsert, conditional writes with version/ETag/If-Match, natural deterministic keys, set-don't-increment) and by key second (client Idempotency-Key header, a dedup table keyed unique on the key that stores request fingerprint + status + response and replays the SAME response, 409 in-progress lock for concurrent duplicates, 422 on key-reuse-with-different-body), plus consumer-side dedup (processed-event-id store / dedup window), the outbox pattern for atomic write+publish, and DB mechanics (ON CONFLICT, SELECT FOR UPDATE / advisory locks). Effectively-once via dedup, because exactly-once delivery is a myth.

About this listing

Category
General
Reported license
Apache-2.0
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
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Idempotency Keys | Agent Skills Atlas