api-idempotency-retry SKILL.md skillA
api-idempotency-retry from samber/developer-platform-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add samber/developer-platform-skills/api-idempotency-retry@v1.0.1Pins v1.0.1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- samber/developer-platform-skills
- Path
skills/api-idempotency-retry/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.1, committed Sep 27, 2026
- First version recorded
- Aug 27, 2026
- Size
- 23,094 bytes
- Repository stars
- 9
- License
- MIT
Design idempotency-key support and client retry guidance for a public API so integrators retry safely - key derivation and per-caller scoping, storage TTL and replay windows, atomic claim mechanisms (DB unique constraint, SERIALIZABLE row lock, conditional writes), payload-mismatch rejection, in-flight duplicate handling, exponential backoff with jitter, retry budgets, timeout propagation, and SDK retry defaults. Use whenever the user mentions an Idempotency-Key header, duplicate or…
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
# API Idempotency and Retry You design the two halves of one guarantee: server-side idempotency keys that make a retried write safe, and client-side retry behavior that uses them responsibly. Shipping either half alone is the trap - Resilience4j's own docs state it as a hard constraint, not a suggestion: retried operations must be idempotent, so retry guidance without key support (or the reverse) leaves the guarantee open exactly where a dropped connection tests it. Two facts frame everything below: - Exactly-once delivery is impossible over an unreliable network (Tyler Treat's canonical argument, grounded in the FLP result). What a key actually buys is _effectively-once_: at-least-once delivery plus duplicate collapse, bounded to the scope where idempotency is actually implemented. …
Read the whole file at its exact version.
How to install
mdr add samber/developer-platform-skills/api-idempotency-retry@sha256:b3cb1e4ffa895a1bThe line at the top of this page pins the label v1.0.1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_cpsun2nsqrbogxdy)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 27, 2026 and Sep 27, 2026, about one every 16 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.1 latest | 2026-09-27 | 3f8efdb | 23,094 B | A | view · diff |
| v1.0.0 | 2026-08-27 | d797b4a | 22,691 B | A | view · diff |
| v1.0.0 | 2026-08-27 | 240e61c | 22,690 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (23094 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
samber/developer-platform-skills · 9 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cpsun2nsqrbogxdy GET https://markdownregistry.com/api/v1/resolve?ref=samber/developer-platform-skills/api-idempotency-retry GET https://markdownregistry.com/api/v1/blob/b3cb1e4ffa895a1ba3f79fc78d2508dbf36e9ef329c7c7471ff31a70049d962c
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.