write-a-skill
Skill-author skill: create new agent skills with proper structure, progressive disclosure, and bundled resources.
Attribution
Derived from Matt Pocock's write-a-skill (MIT-licensed). Matt's skills repo — "Skills for Real Engineers. Straight from my .claude directory" — is the original source. Matt's SKILL.md voice + 3-phase workflow (Gather → Draft → Review) preserved verbatim per his MIT license.
What this adds on top of Matt's original
| Addition | Where | Why |
|---|---|---|
| 3 stdlib Python validation tools | skills/write-a-skill/scripts/ |
Operationalize Matt's review checklist (description validator, structure validator, review-checklist runner). Catches the common mistakes Matt names. |
| 3 in-depth references (5+ sources each) | skills/write-a-skill/references/ |
Progressive disclosure principles · Description design patterns · Quality gates for skills. Cites Anthropic skill docs + community precedent + research. |
| cs-skill-author persona agent | agents/cs-skill-author.md |
Surface skill-authoring as a forcing-question interrogation matching our cs-* persona pattern. |
/cs:write-a-skill slash command |
commands/cs-write-a-skill.md |
6-question forcing interrogation that runs Matt's review checklist programmatically. |
What Matt's original brings (preserved)
- The 3-phase workflow: Gather → Draft → Review
- The non-negotiable description rule: "The description is the only thing your agent sees when deciding which skill to load."
- The 100-line SKILL.md ceiling + progressive-disclosure pattern (REFERENCE.md / EXAMPLES.md / scripts)
- The good-example vs bad-example contrast for description writing
- The 6-item review checklist
- Matt's directness — no fluff, concrete patterns
Quick start
# Run Matt's review checklist on an existing skill
python skills/write-a-skill/scripts/skill_review_checklist_runner.py path/to/SKILL.md
# Validate description meets Matt's criteria (≤1024 chars, third person, "Use when" trigger)
python skills/write-a-skill/scripts/skill_description_validator.py path/to/SKILL.md
# Validate skill folder structure
python skills/write-a-skill/scripts/skill_structure_validator.py path/to/skill-folder/
All three tools run with embedded samples if no path provided.
License
MIT (matching Matt's upstream).