Umbraco Skill Validator

This validates all the SKILL.md files in your Umbraco repository by running deterministic scripts that check external URLs, skill references, internal links, file paths, and import statements. It generates a JSON report of broken links and missing references, then spawns a fixer subagent that suggests specific changes in diff format for you to approve. The validation runs via slash command or directly in CI/CD, and it handles edge cases like rate limiting and redirects. Honestly, this is the kind of thing you set up once and forget about until it catches a broken documentation link before users do.

skills.sh installs: 386
GitHub stars: 27
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add umbraco/umbraco-cms-backoffice-skills --skill umbraco-skill-validator --agent claude-code

Installs into .claude/skills of the current project.

Files

Skill Content Validator

Validates all SKILL.md files in the repository for broken links, missing references, and invalid paths.

What This Skill Does

Runs deterministic validation script - Fast, consistent checking of all links
Generates structured report - JSON output with all issues found
Spawns fixer subagent - AI-powered fix suggestions for issues
Presents fix plan - Diff-style changes for approval
Executes approved fixes - Only applies changes user approves

Validation Checks

Check Type	Description
External URLs	HTTP HEAD request to verify accessibility
Skill references	Verify referenced skills exist (e.g., `umbraco-dashboard`)
Internal links	Check relative paths resolve (e.g., `patterns/foo.md`)
File paths	Verify Umbraco-CMS paths via GitHub API if not local
Import paths	Check `@umbraco-cms/backoffice/*` imports are valid

Running the Validator

Via Slash Command

/validate-skills

Via Script Directly (CI/CD)

cd .claude/skills/umbraco-skill-validator/scripts
npm install
npm run validate

SKILL.md on GitHub

Details

Repository: github.com/umbraco/umbraco-cms-backoffice-skills
Category: .NET & C#
First seen: Jun 3, 2026