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project-api-validation SKILL.md skillA

project-api-validation from seonaru/nulnul-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add seonaru/nulnul-harness/project-api-validation@git:20260902.749d57b

Pins git:20260902.749d57b in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: seonaru/nulnul-harness
Path: evals/foundation-final-continuation/fixtures/lifecycle/.agents/skills/project-api-validation/SKILL.md
Versions recorded: 1
Latest version: git:20260902.749d57b, committed Sep 2, 2026
Size: 752 bytes
Repository stars: 34
License: MIT

Apply this repository's webhook request-validation and error-code contract when API acceptance or rejection behavior changes.

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

# Project API validation

Use this procedure for request-validation changes:

1. Inspect the target webhook handler and its unit tests.
2. Preserve absent, empty, and already accepted inputs.
3. Preserve `errors.problem(field, code)` and reject invalid input before any registry mutation.
4. Add every new error code to `contracts/error-codes.json`; keep it sorted and unique.
5. Run `python3 -m unittest -q`.
6. Run `python3 tools/verify_error_catalog.py`.

Do not use this Skill for internal algorithms or release documentation.

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add seonaru/nulnul-harness/project-api-validation@sha256:ff647483d4f4cb6e

The line at the top of this page pins the label git:20260902.749d57b, 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_62opvxhytbkbwwvs.svg)](https://markdownregistry.com/a/art_62opvxhytbkbwwvs)

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

Versions

The registry has recorded 1 version of this file, committed on Sep 2, 2026.

version	committed	commit	size	audit
git:20260902.749d57b latest	2026-09-02	749d57b	752 B	A	view

Audit of the latest version

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

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (752 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

GitHub

seonaru/nulnul-harness · 34 stars · license MIT · pushed 2026-09-10 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_62opvxhytbkbwwvs
GET https://markdownregistry.com/api/v1/resolve?ref=seonaru/nulnul-harness/project-api-validation
GET https://markdownregistry.com/api/v1/blob/ff647483d4f4cb6ea7cc70ae0f4032453399785fca03a9d1450082cd626f4d7b

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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project-api-validation SKILL.md skill

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