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Comprehensive link validation methodology for markdown links including format requirements, path validation, broken link detection, external link verification, and checker implementation patterns
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| name | docs-validating-links |
| description | Comprehensive link validation methodology for markdown links including format requirements, path validation, broken link detection, external link verification, and checker implementation patterns |
| created | "2025-01-22T00:00:00.000Z" |
This Skill provides comprehensive guidance for validating markdown links across the repository, including internal link validation, external link verification, and checker implementation strategies.
Use this Skill when:
Broken links:
Link validation:
What to validate:
What NOT to validate:
Documentation files (docs/, repo-governance/, plans/, root .md files):
✅ PASS: File Naming Convention ✅ PASS: AI Agents Convention
❌ FAIL: File Naming Convention ← Missing .md extension ❌ FAIL: [[file-naming]] ← Wiki-link syntax (GitHub does not render these) ❌ FAIL: file-naming.md ← Using filename as link text
Note: Both apps/ayokoding-www/ and apps/ose-www/ have migrated to Next.js 16. Their content links are validated by their respective CLI tools (ayokoding-cli links check, ose-cli links check), not by this Skill's link validation rules.
Step 1: Extract Links from Markdown
Use regex or markdown parser to extract all links
Step 2: Categorize Links
Separate into categories:
Step 3: Validate Internal Links
For each internal link:
Error 1: Missing .md extension
❌ FAIL: File Naming ✅ PASS: File Naming
Criticality: HIGH - Breaks GitHub web navigation Detection: Check link ends with .md (docs/ files only)
Error 2: Wrong relative path depth
From: repo-governance/conventions/formatting/linking.md (3 levels deep) ❌ FAIL: Documentation Home ← Only 1 ../, need 3 ✅ PASS: Documentation Home
Criticality: CRITICAL - Link points to wrong file or 404 Detection: Resolve path and check file exists
Error 3: Wiki-link syntax
❌ FAIL: [[file-naming-convention]] ❌ FAIL: [[file-naming-convention|File Naming]] ✅ PASS: File Naming Convention
Criticality: HIGH - GitHub does not render wiki-style links Detection: Regex match for wiki-style links
Error 4: Filename as link text
❌ FAIL: file-naming.md ✅ PASS: File Naming Convention
Criticality: MEDIUM - Poor accessibility and readability Detection: Check if link text matches filename pattern or contains file extension
Challenge: External links can be slow to verify (network requests)
Recommended approach:
Verification steps:
Cache file format (JSON):
{ "https://diataxis.fr/": { "status": "OK", "http_code": 200, "last_checked": "2026-01-25T13:30:00+07:00", "ttl": 604800 } }
Cache TTL recommendations:
Error 1: Link returns 404
Criticality: HIGH - Link is dead, user gets 404 Action: Update or remove link
Error 2: Link redirects (301/302)
Criticality: LOW - Link works but could be updated to final URL Action: Consider updating to final destination (optional)
Error 3: Link times out
Criticality: MEDIUM - May be temporary network issue Action: Re-verify after TTL expires, flag if persistent
Standard 5-step checker workflow:
Step 0: Initialize Report Step 1: Discover Files (glob for *.md) Step 2: Extract Links (parse markdown, categorize) Step 3: Validate Internal Links (file exists, format correct) Step 4: Validate External Links (HTTP request, cache results) Step 5: Finalize Report (summary, grouped by criticality)
CRITICAL: Write findings to report file immediately after discovery (don't buffer in memory)
Why: Context compaction can lose buffered findings during long validation runs
Required tools:
CRITICAL (Must fix before publication):
[[...]] links)HIGH (Should fix before publication):
MEDIUM (Fix when convenient):
LOW (Optional improvements):
Link checkers use both verification status AND criticality:
Finding: [BROKEN] - Internal Link to Non-Existent File
Verification: [BROKEN] - Target file does not exist Criticality: CRITICAL - Breaks user navigation
Verification labels:
Why dual labels?
Linking Standards:
Validation Standards:
Quality Standards:
Validation Skills:
Domain Skills:
Link Validation Agents: