idempotency-handling SKILL.md skillA
idempotency-handling from secondsky/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add secondsky/claude-skills/idempotency-handling@git:20260402.75421faPins git:20260402.75421fa in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- secondsky/claude-skills
- Path
plugins/idempotency-handling/skills/idempotency-handling/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260402.75421fa, committed Apr 2, 2026
- First version recorded
- Dec 24, 2025
- Size
- 5,618 bytes
- Repository stars
- 247
- License
- MIT
Idempotent API operations with idempotency keys, Redis caching, DB constraints. Use for payment systems, webhook retries, safe retries, or encountering duplicate processing, race conditions, key expiry errors.
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
# Idempotency Handling
Ensure operations produce identical results regardless of execution count.
## Idempotency Key Pattern
```javascript
const redis = require('redis');
const client = redis.createClient();
async function idempotencyMiddleware(req, res, next) {
const key = req.headers['idempotency-key'];
if (!key) return next();
const cached = await client.get(`idempotency:${key}`);
if (cached) {
const { status, body } = JSON.parse(cached);
return res.status(status).json(body);
}
// Store original send
const originalSend = res.json.bind(res);
res.json = async (body) => {
await client.setEx(
`idempotency:${key}`,
86400, // 24 hours
JSON.stringify({ status: res.statusCode, body })
);
return originalSend(body);
};
next();
}
```
## Database-Backed Idempotency
```sql
CREATE TABLE idempotency_keys (
key VARCHAR(255) PRIMARY KEY,
request_hash VARCHAR(64) NOT NULL,
response JSONB,
status VARCHAR(20) DEFAULT 'processing',
created_at TIMESTAMP DEFAULT NOW(),
expires_at TIMESTAMP DEFAULT NOW() + INTERVAL '24 hours'
);
CREATE INDEX idx_idempotency_expires ON idempotency_keys(expires_at);
```
```javascript
…Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/idempotency-handling@sha256:16519969262ccba3The line at the top of this page pins the label git:20260402.75421fa, 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_kpxvjnu3mrhcjwlt)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Dec 24, 2025 and Apr 2, 2026, about one every 100 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260402.75421fa latest | 2026-04-02 | 75421fa | 5,618 B | A | view · diff |
| git:20251224.ba827ce | 2025-12-24 | ba827ce | 5,605 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 (5618 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
secondsky/claude-skills · 247 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kpxvjnu3mrhcjwlt GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/idempotency-handling GET https://markdownregistry.com/api/v1/blob/16519969262ccba332166fc7d817e2b1d6f2121af1a93f52b02ef66ac5da0ee0
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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