**Problem:** (PR #170 verified)
Three skill builders were generating SKILL.md files without YAML
frontmatter, making skills invisible to Claude after upload:
- unified_skill_builder.py
- github_scraper.py
- pdf_scraper.py
Only doc_scraper.py had frontmatter implemented.
**Root Cause:**
Claude requires YAML frontmatter with 'name' and 'description' fields
to recognize and index skills. Without it, uploaded skills don't appear
in skill lists and can't be triggered.
**Fix:**
Added consistent frontmatter generation to all three builders:
- Normalizes skill name (lowercase, hyphens, max 64 chars)
- Truncates description to 1024 chars (Claude requirement)
- Generates YAML frontmatter with proper formatting
**Test Results:**
✅ All 390/390 tests passing (0 failures, 0 skipped)
✅ Consistent implementation across all builders
✅ Meets Claude's official skill specification
**Example Output:**
```yaml
---
name: my-skill-name
description: Skill description here
---
# My Skill Name
...
```
**Credits:**
Original fix by @AbdelrahmanHafez in PR #170
Rebased to current development by Claude Code
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: AbdelrahmanHafez <AbdelrahmanHafez@users.noreply.github.com>
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