skill-check

# SkillCheck (Free) Check skills against Anthropic guidelines and the agentskills specification. This file contains Free tier validation rules. **Want deeper analysis?** [Upgrade to Pro](https://getskillcheck.com) for anti-slop detection, security scanning, token optimization, WCAG compliance, enterprise checks, and Eval Kit (auto-generated test prompts for your skills). ## Prerequisites - Any AI assistant with file Read capability (Claude Code, Cursor, Windsurf, Codex CLI) - Works on any platform (Unix/macOS/Windows) - No special tools required (Read-only; the Invisible Unicode checks also use Grep, which stays read-only) - No environment variables or API keys required; the checks run fully offline ## Interface - **Input**: path(s) to SKILL.md files, plus any `references/*.md` files in the same skill folder - **Output**: a validation report listing each issue with check ID, severity (Critical / Warning / Suggestion), line number, and fix; strengths reported in a separate list - **Modes**: runs standalone on a single skill or over a directory of skills, one report per skill ## Workflow Run the four stages in order for each target skill. Data flows forward: the file list from Step 1 feeds Step 2, the loaded content feeds Step 3, and the findings feed Step 4. - **Step 1: Locate** — find target SKILL.md file(s) with Glob - **Step 2: Read** — load the SKILL.md content and any `references/` files - **Step 3: Validate** — apply each rule section below to the loaded content...