api-framework-express SKILL.md skillA
api-framework-express from agents-inc/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add agents-inc/skills/api-framework-express@git:20261016.afd0e14Pins git:20261016.afd0e14 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- agents-inc/skills
- Path
src/skills/api-framework-express/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261016.afd0e14, committed Oct 16, 2026
- First version recorded
- Feb 2, 2026
- Size
- 13,093 bytes
- Repository stars
- 26
- License
- MIT
Express.js routes, middleware, error handling, request/response patterns.
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 Development with Express.js > **Quick Guide:** Express uses middleware-based request processing. The three non-negotiable patterns: modular routing via `express.Router()`, centralized error handling with 4-argument middleware `(err, req, res, next)`, and correct middleware ordering (security first, error handler last). Express 5 (now stable, default on npm) auto-forwards async errors; Express 4 requires manual `next(err)` or a wrapper. --- <critical_requirements> ## CRITICAL: Before Using This Skill **(You MUST define error-handling middleware with 4 arguments: `(err, req, res, next)` - Express identifies error handlers by arity)** **(You MUST register error handlers AFTER all routes and other middleware)** **(You MUST call `next(err)` to forward async errors in Express 4 - Express 5 auto-forwards rejected promises)** **(You MUST use `express.json()` and `express.urlencoded()` for body parsing - `req.body` is undefined without them)** </critical_requirements> --- …
Read the whole file at its exact version.
How to install
mdr add agents-inc/skills/api-framework-express@sha256:aadbd7e015b83434The line at the top of this page pins the label git:20261016.afd0e14, 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_77dsz3vv77wcqsaa)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Feb 2, 2026 and Oct 16, 2026, about one every 85 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261016.afd0e14 latest | 2026-10-16 | afd0e14 | 13,093 B | A | view · diff |
| git:20260320.ead8e05 | 2026-03-20 | ead8e05 | 13,292 B | A | view · diff |
| git:20260316.5c62783 | 2026-03-16 | 5c62783 | 12,964 B | A | view · diff |
| git:20260202.b236384 | 2026-02-02 | b236384 | 21,427 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 (13093 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
agents-inc/skills · 26 stars · license MIT · pushed 2026-10-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_77dsz3vv77wcqsaa GET https://markdownregistry.com/api/v1/resolve?ref=agents-inc/skills/api-framework-express GET https://markdownregistry.com/api/v1/blob/aadbd7e015b8343490ef3ec6b52f459430f24ba18dca14f0622edab4a78200a4
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.