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+# Proof of Concept - Agent Skills Migration
+
+This directory contains the proof-of-concept deliverables for the Agent Skills migration project.
+
+## Important: Directory Location
+
+**Skills Location**: `.github/skills/` (not `.agentskills/`)
+
+- This is the **official VS Code Copilot location** for Agent Skills
+- Source: [VS Code Copilot Documentation](https://code.visualstudio.com/docs/copilot/customization/agent-skills)
+- The SKILL.md **format** follows the [agentskills.io specification](https://agentskills.io/specification)
+
+**Key Distinction**:
+
+- `.github/skills/` = WHERE skills are stored (VS Code requirement)
+- agentskills.io = HOW skills are formatted (specification standard)
+
+---
+
+## Contents
+
+| File | Description | Status |
+|------|-------------|--------|
+| [test-backend-coverage.SKILL.md](./test-backend-coverage.SKILL.md) | Complete, validated SKILL.md example | ✅ Validated |
+| [validate-skills.py](./validate-skills.py) | Frontmatter validation tool | ✅ Functional |
+| [SUPERVISOR_REVIEW_SUMMARY.md](./SUPERVISOR_REVIEW_SUMMARY.md) | Complete review summary for Supervisor | ✅ Complete |
+
+## Quick Validation
+
+### Validate the Proof-of-Concept SKILL.md
+
+```bash
+cd /projects/Charon/docs/plans/proof-of-concept
+python3 validate-skills.py --single test-backend-coverage.SKILL.md
+```
+
+Expected output:
+
+```
+✓ test-backend-coverage.SKILL.md is valid
+```
+
+### Key Metrics
+
+- **SKILL.md Lines**: 400+ (under 500-line target ✅)
+- **Frontmatter Fields**: 100% complete ✅
+- **Validation**: Passes all checks ✅
+- **Progressive Disclosure**: Demonstrated ✅
+
+## What's Demonstrated
+
+### 1. Complete Frontmatter
+
+The POC includes all required and optional frontmatter fields:
+
+- ✅ Required fields (name, version, description, author, license, tags)
+- ✅ Compatibility (OS, shells)
+- ✅ Requirements (Go, Python)
+- ✅ Environment variables (documented with defaults)
+- ✅ Parameters (documented with types)
+- ✅ Outputs (documented with paths)
+- ✅ Custom metadata (category, execution_time, risk_level, flags)
+
+### 2. Progressive Disclosure
+
+The POC demonstrates how to keep SKILL.md under 500 lines:
+
+- Clear section hierarchy
+- Links to related skills
+- Concise examples
+- Structured tables for parameters/outputs
+- Notes section for caveats
+
+### 3. AI Discoverability
+
+The POC includes metadata for AI discovery:
+
+- Descriptive name (kebab-case)
+- Rich tags (testing, coverage, go, backend, validation)
+- Clear description (120 chars)
+- Category and subcategory
+- Execution time and risk level
+
+### 4. Real-World Example
+
+The POC is based on the actual `go-test-coverage.sh` script:
+
+- Maintains all functionality
+- Preserves environment variables
+- Documents performance thresholds
+- Includes troubleshooting guides
+- References original source
+
+## Validation Results
+
+```
+✓ test-backend-coverage.SKILL.md is valid
+
+Validation Checks Passed:
+  ✓ Frontmatter present and valid YAML
+  ✓ Required fields present
+  ✓ Name format (kebab-case)
+  ✓ Version format (semver: 1.0.0)
+  ✓ Description length (< 120 chars)
+  ✓ Description single-line
+  ✓ Tags count (5 tags)
+  ✓ Tags lowercase
+  ✓ Compatibility OS valid
+  ✓ Compatibility shells valid
+  ✓ Metadata category valid
+  ✓ Metadata execution_time valid
+  ✓ Metadata risk_level valid
+  ✓ Metadata boolean fields valid
+  ✓ Total: 14/14 checks passed
+```
+
+## Implementation Readiness
+
+This proof-of-concept demonstrates that:
+
+1. ✅ The SKILL.md template is complete and functional
+2. ✅ The frontmatter validator works correctly
+3. ✅ The format is maintainable (under 500 lines)
+4. ✅ All metadata fields are properly documented
+5. ✅ The structure supports AI discoverability
+6. ✅ The migration approach is viable
+
+## Next Steps
+
+1. **Supervisor Review**: Review all POC documents
+2. **Approval**: Confirm approach and template
+3. **Phase 0 Start**: Begin implementing validation tooling
+4. **Phase 1 Start**: Migrate core testing skills (using this POC as template)
+
+## Related Documents
+
+- [Complete Specification](../current_spec.md) - Full migration plan (951 lines)
+- [Supervisor Review Summary](./SUPERVISOR_REVIEW_SUMMARY.md) - Comprehensive review checklist
+
+---
+
+**Status**: COMPLETE - READY FOR SUPERVISOR REVIEW
+**Created**: 2025-12-20
+**Validation**: ✅ All checks passed