Link Validator

Validates markdown links in Claude Code skills for portability across installation locations.

The Problem

Skills with absolute repo paths break when installed elsewhere:

Path Type	Example	Works When Installed?
Absolute repo	/skills/foo/SKILL.md	No - path doesn't exist
Relative	./references/guide.md	Yes - always resolves
Relative parent	../sibling/SKILL.md	Yes - always resolves

When to Use This Skill

• Before distributing a skill/plugin
• After creating new markdown links in skills
• When CI reports link validation failures
• To audit existing skills for portability issues

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TodoWrite Task Templates

Template A: Validate Single Skill

1. Identify skill path to validate
2. Run: uv run scripts/validate_links.py <skill-path>
3. Review violation report (if any)
4. For each violation, apply suggested fix
5. Re-run validator to confirm all fixed

Template B: Validate Plugin (Multiple Skills)

1. Identify plugin root directory
2. Run: uv run scripts/validate_links.py <plugin-path>
3. Review grouped violations by skill
4. Fix violations skill-by-skill
5. Re-validate entire plugin

Template C: Fix Violations

1. Read violation report output
2. Locate file and line number
3. Review suggested relative path
4. Apply fix using Edit tool
5. Re-run validator on file

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Post-Change Checklist

After modifying this skill:

1. Script remains in sync with latest patterns
2. References updated if new patterns added
3. Tested on real skill with violations

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Quick Start

# Validate a single skill
uv run scripts/validate_links.py ~/.claude/skills/my-skill/

# Validate a plugin with multiple skills
uv run scripts/validate_links.py ~/.claude/plugins/my-plugin/

# Dry-run in current directory
uv run scripts/validate_links.py .

Exit Codes

Code	Meaning
0	All links valid (relative paths)
1	Violations found (absolute repo paths)
2	Error (invalid path, no markdown files)

What Gets Checked

Flagged as Violations:

• /skills/foo/SKILL.md - Absolute repo path
• /docs/guide.md - Absolute repo path

Allowed (Pass):

• ./references/guide.md - Relative same directory
• ../sibling/SKILL.md - Relative parent
• https://example.com - External URL
• #section - Anchor link

Reference Documentation

• Link Patterns Reference - Detailed pattern explanations and fix strategies