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validate-skill

validate-skill

github.com/youdotcom-ossTesting & quality9744 installsUpdated today
Repository

About validate-skill

validate-skill is a command-line tool for checking skill directories against the AgentSkills specification. It is intended for skill authors and reviewers, and checks required fields, naming rules, and directory-name consistency, with optional JSON output.

Key features

  1. 01Validates one or more skill directories
  2. 02Checks required frontmatter fields
  3. 03Checks naming rules and directory-name match
  4. 04Supports JSON output

Use cases

  1. 01Check skill structure after creating a skill
  2. 02Review a PR that changes skills
  3. 03Validate names and fields before publishing

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/youdotcom-oss/agent-skills --skill validate-skill

After installing, type/validate-skillin Claude Code to confirm it loaded.

Details

From the project README

Validate Skill

Purpose

This skill validates skill directories against the AgentSkills specification. Use it to ensure your skills have proper frontmatter, required fields, and follow naming conventions.

Use when:

  • Creating new skills in any agent's skills directory (.claude/skills/, .cursor/skills/, etc.)
  • Reviewing PRs that modify skills
  • Validating skill structure before publishing

Scripts

validate-skill.ts

Validate one or more skill directories.

bunx @plaited/development-skills validate-skill [paths...]

Arguments:

  • paths: Paths to validate (defaults to current agent's skills directory)

Options:

  • --json: Output results as JSON

Examples:

# Validate skills in current directory's .claude/skills/
bunx @plaited/development-skills validate-skill .claude/skills

# Validate Cursor skills
bunx @plaited/development-skills validate-skill .cursor/skills

# Validate a specific skill
bunx @plaited/development-skills validate-skill .claude/skills/typescript-lsp

# Validate multiple paths with JSON output
bunx @plaited/development-skills validate-skill .claude/skills .cursor/skills --json

Validation Rules

Required Fields
  • name: Skill name (lowercase, alphanumeric with hyphens)
  • description: Brief description of the skill
Naming Conventions
  • Name must be lowercase
  • Only alphanumeric characters and hyphens allowed
  • Cannot start or end with hyphen
  • Cannot contain consecutive hyphens
  • Maximum 64 characters
  • Directory name must match skill name
Optional Fields
  • license: License identifier
  • compatibility: Runtime requirements
  • allowed-tools: Comma-separated list of allowed tools
  • metadata: Key-value pairs for additional metadata

Output Format

Human-Readable (default)
✓ .claude/skills/typescript-lsp
✓ .cursor/skills/my-skill
✗ .claude/skills/invalid-skill
  ERROR: Missing required field in frontmatter: 'description'

2/3 skills valid
JSON (--json)
[
  {
    "valid": true,
    "path": ".cursor/skills/my-skill",
    "errors": [],
    "warnings": [],
    "properties": {
      "name": "my-skill",
      "description": "..."
    }
  }
]

Related Skills

  • typescript-lsp - Example of a well-structured skill with scripts
  • code-documentation - TSDoc standards for TypeScript/JavaScript code

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