validate-frontmatter SKILL.md skillA
validate-frontmatter from coalesce-labs/catalyst is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add coalesce-labs/catalyst/validate-frontmatter@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- coalesce-labs/catalyst
- Path
plugins/meta/skills/validate-frontmatter/SKILL.md- Versions recorded
- 6
- Latest version
- v1.0.0, committed Sep 27, 2026
- First version recorded
- Apr 29, 2026
- Size
- 2,824 bytes
- Repository stars
- 20
- License
- none declared
Validates YAML frontmatter on plugins/*/skills/*/SKILL.md and plugins/*/agents/*.md against docs/frontmatter-standard.md and .agents/rules/plugin-editing.md: required fields, the disable-model-invocation/user-invocable polarity, allowed-tools vs tools, and skill-only fields that must not leak (model, category). Use when adding or editing a skill or agent, before opening a PR that touches plugins/**, or paired with audit-references to confirm a plugin cleanup's frontmatter didn't drift.
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
# Validate Frontmatter Checks every skill and agent in the repo against the current frontmatter standard and reports (or fixes) drift. ## The standard Field tables are the single source in [`docs/frontmatter-standard.md`](../../../../docs/frontmatter-standard.md) — don't restate them here. The skills-only shape rule (`no commands/ directories — skills only`) is in [`.agents/rules/plugin-editing.md`](../../../../.agents/rules/plugin-editing.md). ## The rule everyone gets backwards `disable-model-invocation: true` marks a **user-invoked** skill — a human runs it explicitly via `/plugin:skill`, and the model is *disabled* from auto-triggering it off its description. `user-invocable: false` (a different key) marks a CI/background skill nobody explicitly invokes. Getting this backwards tells authors to set every user-invoked skill to the value that lets the model auto-trigger it — the opposite of what "user-invoked" means. Full table: [references/checklist.md](references/checklist.md). ## Process 1. **Glob** `plugins/*/skills/*/SKILL.md` and `plugins/*/agents/*.md`. …
Read the whole file at its exact version.
How to install
mdr add coalesce-labs/catalyst/validate-frontmatter@sha256:303ee67a8435d28fThe 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.
[](https://markdownregistry.com/a/art_d3u4meazxvuj3el7)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Apr 29, 2026 and Sep 27, 2026, about one every 30 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-27 | 15ff868 | 2,824 B | A | view · diff |
| v1.0.0 | 2026-08-26 | e9b5dac | 2,824 B | A | view · diff |
| v1.0.0 | 2026-08-26 | 5f4fa48 | 15,867 B | A | view · diff |
| v1.0.0 | 2026-06-25 | c996d95 | 15,868 B | A | view · diff |
| v1.0.0 | 2026-06-24 | 42ffc53 | 15,313 B | A | view · diff |
| v1.0.0 | 2026-04-29 | 870e84e | 15,483 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 (2824 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
coalesce-labs/catalyst · 20 stars · license none declared · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_d3u4meazxvuj3el7 GET https://markdownregistry.com/api/v1/resolve?ref=coalesce-labs/catalyst/validate-frontmatter GET https://markdownregistry.com/api/v1/blob/303ee67a8435d28f40ebfbf23fb710375cf13f8ad79b9da663265a3f1e4378e3
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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