SkillCheck — Validate Agent Skills for Claude, Cursor, VS Code

Works with the Agent Skills open standard

Cursor · VS Code · Claude Code · GitHub · Goose · Amp · OpenCode · Windsurf

You built a skill. But is it good?

Agent Skills are now an open standard adopted by Microsoft, Cursor, and dozens of coding agents. Your skill needs to work everywhere.

? Does the YAML frontmatter follow the spec?
? Will it trigger when users actually need it?
? Is it accessible? Readable? Not full of LLM slop?

You won't know until someone complains. Or you run SkillCheck.

What It Checks

Category	What We Catch
Structure	Missing fields, invalid names, broken YAML
Triggers	Vague descriptions, missing WHEN clauses
Semantics	Contradictions, ambiguous instructions
Anti-Slop	"Let's dive in", hedge words, filler phrases
Accessibility	WCAG issues in visual output skills
Security	MCP best practices for technical skills

How It Works

1 Point SkillCheck at your SKILL.md

2 Get a report: Critical → Warnings → Suggestions

3 Fix issues before publishing

## my-awesome-skill Check Results

### Critical Issues (must fix)
- Description missing WHEN clause. Add trigger context.

### Warnings (should fix)
- Line 47: Vague term "several" — specify a number
- No error handling documented

### Passed Checks
- Valid YAML structure ✓
- Name follows conventions ✓
- No anti-slop patterns detected ✓

### Pro Checks (coming soon)
🔒 Anti-slop score: — / 100
🔒 WCAG accessibility: —
🔒 Marketplace readiness: —

Pricing

Free

$0 forever

✓ Core structure checks
✓ Semantic validation
✓ Run locally, unlimited
✓ Open source (MIT)

Get Started

Pro

549 DKK lifetime

✓ Everything in Free
✓ Anti-slop scoring (0-100)
✓ WCAG accessibility checks
✓ Marketplace readiness report
✓ Priority support

Get Pro

COMING SOON

Team

$49 /month

up to 10 users

✓ Everything in Pro
✓ Custom rulesets
✓ Team dashboard
✓ CI/CD integration

FAQ

Is this official Anthropic tooling?

No. SkillCheck is an independent project. It validates against the Agent Skills open standard, which Anthropic created and open-sourced in December 2025.

What platforms does it work with?

Any platform supporting the Agent Skills standard: Claude Code, Cursor, VS Code, GitHub, Goose, Amp, OpenCode, Windsurf, and more.

What about MCP servers?

SkillCheck validates skill definitions, not MCP server implementations. Skills and MCP are complementary; MCP provides connectivity, skills provide procedural knowledge.

Can I use it in CI/CD?

Pro and Team tiers will include GitHub Actions integration. Block PRs that introduce low-quality skills.

What if I disagree with a check?

SkillCheck reports issues; you decide what to fix. Some checks are suggestions, not requirements.

Ship better skills.
Catch issues before your users do.