skill-linter

skill-linter is a plugin for Claude Code from alexmond/alexmskills. Its manifest loads nothing; the 1 skill it bundles cost 125 tokens per session together, scanned A, original, MIT.

A checker for SKILL.md files, which are instruction files used to guide coding agents.

In plain words
What is it for?
Use it to audit agent-skill files locally or as a CI check, with findings grouped by severity and rules that can be expanded from missed defects.
Why use it?
It catches invalid metadata, unclear activation descriptions, oversized content, poor progressive disclosure, and broken references before they cause problems.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it to audit agent-skill files locally or as a CI check, with findings grouped by severity and rules that can be expanded from missed defects.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add alexmond/alexmskills
/plugin install skill-linter
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/alexmond/alexmskills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for skill-linter

README.md
[![agentmods](https://agentmods.dev/badge/plugins/alexmond/alexmskills/skill-linter/github.svg)](https://agentmods.dev/plugins/alexmond/alexmskills/skill-linter)
Your own site
<a href="https://agentmods.dev/plugins/alexmond/alexmskills/skill-linter"><img src="https://agentmods.dev/badge/plugins/alexmond/alexmskills/skill-linter/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for skill-linter

Your own site · 80×15
<a href="https://agentmods.dev/plugins/alexmond/alexmskills/skill-linter"><img src="https://agentmods.dev/badge/plugins/alexmond/alexmskills/skill-linter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill cost 125 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

skill-linter scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/skill-linter/.claude-plugin/plugin.json · 21 lines

What it actually says

{
  "$schema": "https://json.schemastore.org/claude-code-plugin.json",
  "name": "skill-linter",
  "description": "Audit SKILL.md files against published skill-authoring guidance — frontmatter validity, whether the description actually says when to trigger, body size, progressive disclosure, and broken references. Zero-dependency Python checker with three severity levels, usable as a CI gate. Self-learning: a defect it fails to catch becomes a new rule in the consuming repo, and a rule that proves itself graduates into the shipped checker.",
  "version": "0.5.0",
  "author": {
    "name": "Alex Mondshain",
    "email": "[email protected]"
  },
  "homepage": "https://www.alexmond.org/alexmskills/",
  "repository": "https://github.com/alexmond/alexmskills",
  "license": "MIT",
  "keywords": [
    "skills",
    "lint",
    "quality",
    "self-learning",
    "authoring"
  ]
}
Contents

What it installs

The manifest is a name and a version. 1 skill travel with it, and installing the plugin installs all of them — 125 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago Changed 3d2c819e8818
  2. 1mo ago Changed a38c3f17e2d8
  3. 1mo ago First seen · 21 lines scan A 27eedc653ab7

Subscribe to this mod's changes

skill-linter is a plugin published in the GitHub repository alexmond/alexmskills (9 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

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