Home / librefang / librefang · GitHub

apitester-hand-skill SKILL.md skillB

apitester-hand-skill from librefang/librefang is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add librefang/librefang/apitester-hand-skill@v1.0.0

Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.

Audit grade: B, 16 of 17 checks passed
Kind: SKILL.md skill
Repository: librefang/librefang
Path: crates/librefang-runtime/tests/fixtures/registry/hands/apitester/SKILL.md
Versions recorded: 1
Latest version: v1.0.0, committed Jul 10, 2026
Size: 37,219 bytes
Repository stars: 393
License: MIT

Expert knowledge for AI API testing -- HTTP reference, testing patterns, OpenAPI parsing, and load testing techniques.

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 Testing Expert Knowledge

## HTTP Reference

### Status Code Categories
| Range | Category | Common Codes |
|-------|----------|-------------|
| 2xx | Success | 200 OK, 201 Created, 204 No Content |
| 3xx | Redirection | 301 Moved, 304 Not Modified |
| 4xx | Client Error | 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, 422 Unprocessable, 429 Too Many Requests |
| 5xx | Server Error | 500 Internal, 502 Bad Gateway, 503 Service Unavailable, 504 Gateway Timeout |

### curl Quick Reference

**GET with headers**:
```bash
curl -s -H "Authorization: Bearer TOKEN" \
  -H "Accept: application/json" \
  "https://api.example.com/endpoint"
```

**POST with JSON body**:
```bash
curl -s -X POST \
  -H "Authorization: Bearer TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"key": "value"}' \
  "https://api.example.com/endpoint"
```

**Timing information**:
```bash
curl -s -o /dev/null -w "status:%{http_code} time:%{time_total}s size:%{size_download}b" \
  "https://api.example.com/endpoint"
```

**Verbose with headers**:
```bash
curl -v -H "Authorization: Bearer TOKEN" \
  "https://api.example.com/endpoint" 2>&1
```

---

## Testing Patterns
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add librefang/librefang/apitester-hand-skill@sha256:fb0ffca4c9ff6fd9

The line at the top of this page pins the label v1.0.0, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_jra2peekafn4lmdh.svg)](https://markdownregistry.com/a/art_jra2peekafn4lmdh)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Jul 10, 2026.

version	committed	commit	size	audit
v1.0.0 latest	2026-07-10	cde7edb	37,219 B	B	view

Audit of the latest version

B 16 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

fail: No script tag (matched: <script)
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (37219 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

Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.

Source

GitHub

librefang/librefang · 393 stars · license MIT · pushed 2026-11-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_jra2peekafn4lmdh
GET https://markdownregistry.com/api/v1/resolve?ref=librefang/librefang/apitester-hand-skill
GET https://markdownregistry.com/api/v1/blob/fb0ffca4c9ff6fd9192291582230459beeca531bd446569410a3d333337c6da3

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.