craft-skill

name	craft-skill
model	sonnet
description	Create new bigpowers skills with proper structure, progressive disclosure, and bundled resources. Use when user wants to create, write, or build a new skill for the bigpowers lifecycle.
disable-model-invocation	true

Craft Skill

HARD GATE — Do NOT name a skill without a two-word verb-noun pair. Do NOT merge a new skill without running sync-skills.sh — the generated .cursor/rules/ and .gemini/ artifacts must match the source SKILL.md.

CSO Description Discipline (e45s02)

The YAML description is the Catalog Selection Object — the only field agents see when picking a skill.

Rule	Limit
Max length	1024 characters
Voice	Third person
Content	Capability + Use when … triggers only
Forbidden	Workflow steps, phase chains, numbered lists, → verify:, HARD GATE prose

Move process detail into the SKILL.md body or REFERENCE.md — never into description.

Process

1. Gather requirements — ask user about:

   • What task/domain does the skill cover?
   • What specific use cases should it handle?
   • Does it need executable scripts or just instructions?
   • Any reference materials to include?
   • What specs/ output does it produce (if any)?

2. Verify Principles — Ensure the skill aligns with PRINCIPLES.md:

   • Is it atomic (verb-noun)?
   • Is it "deep" (simple interface, complex internal logic)?
   • Does it include Hard Gates?
   • Is it verifiable with a .feature file?

3. Draft the skill — create:

   • SKILL.md with concise instructions (see REFERENCE.md for template)
   • Additional reference files if content exceeds 100 lines
   • Utility scripts if deterministic operations needed

   Auto-skill from library README: When user provides a library README or API docs URL, extract: triggers, HARD GATEs, verify commands, specs/ output — draft SKILL.md without inventing APIs not in the source.

4. Add model: frontmatter (haiku | sonnet | opus) per model-profiles.md.

STREAM CONTINUITY — When writing file content, output in continuous chunks of ~200 lines. Do not pause. Continue immediately until complete. If you need time, emit a placeholder comment rather than going silent.

5. Review with user — present draft and ask:

   • Does this cover your use cases?
   • Anything missing or unclear?
   • Should any section be more/less detailed?

6. Completion-honesty gate (HARD GATE — e45s02) — Before declaring done:

   • Run bash scripts/validate-skill-description.sh skills/<name>/SKILL.md — must exit 0
   • Run bash scripts/sync-skills.sh — must complete without error
   • Run bash scripts/run-skill-verify.sh <name> if the skill defines a verify command
   • Show terminal output for each — narration without evidence is rejected

Naming Rules

Every skill name must be a two-word verb-noun pair. See REFERENCE.md for full rules, examples, and documented exceptions.

specs/ Output

If the skill produces written output, it goes in specs/ at the project root. Document the output file path in the skill body and in CONVENTIONS.md's output files table.

Review Checklist

After drafting, verify:

• Name is a two-word verb-noun pair (or follows grill-me exception)
• Description < 1024 chars, triggers only, no workflow-summary leakage
• Description includes triggers ("Use when...")
• SKILL.md under 100 lines
• No time-sensitive info
• Consistent terminology with CONVENTIONS.md
• specs/ output documented if applicable
• validate-skill-description.sh exits 0
• sync-skills.sh run to propagate to Cursor/Gemini
• bash scripts/validate-skill-catalog.sh passes for the new skill (HARD GATE — completion honesty)

HARD GATE — Do NOT declare the skill done until bash scripts/validate-skill-catalog.sh --strict --skill <name> exits 0. Validator enforces verb-noun name, HARD GATE block, description ≤1024 chars, and → verify: command.

Verify

→ verify: bash scripts/validate-skill-catalog.sh --strict --skill craft-skill && bash scripts/validate-skill-description.sh skills/craft-skill/SKILL.md && echo OK || echo FAIL

---

Craft Skill — Reference

Naming Rules (full)

Every skill name must be a two-word verb-noun pair:

• First word: a verb (survey, model, define, develop, audit…)
• Second word: a noun from PMBOK 6 / Agile vocabulary (context, domain, language, tdd, code…)
• Pronounceable in any language, searchable, no noise words, no encodings
• Exception precedent: grill-me — kept for recognizability

Good: survey-context, audit-code, validate-fix Bad: context-surveyor, code-auditing-skill, fix-validator

Any new naming exception requires an entry in CONVENTIONS.md before the skill is published.

Skill Structure

skill-name/
├── SKILL.md           # Main instructions (required)
├── REFERENCE.md       # Detailed docs (if needed)
├── EXAMPLES.md        # Usage examples (if needed)
└── scripts/           # Utility scripts (if needed)
    └── helper.sh

SKILL.md Template

---
name: skill-name
description: Brief description of capability. Use when [specific triggers].
---

# Skill Name

## Quick start

[Minimal working example]

## Workflows

[Step-by-step processes with checklists for complex tasks]

## Advanced features

[Link to separate files: See [REFERENCE.md](REFERENCE.md)]

Description Requirements

The description is the only thing your agent sees when deciding which skill to load.

Format:

• Max 1024 chars
• Write in third person
• First sentence: what it does
• Second sentence: "Use when [specific triggers]"

Good example:

Investigate a bug by exploring the codebase to find root cause, then write a TDD-based fix plan to specs/bugs/BUG-*.md. Use when user reports a bug, wants to investigate a problem, or mentions "triage".

When to Add Scripts

Add utility scripts when:

• Operation is deterministic (validation, formatting)
• Same code would be generated repeatedly
• Errors need explicit handling

When to Split Files

Split into separate files when:

• SKILL.md exceeds 100 lines
• Content has distinct domains
• Advanced features are rarely needed

sync-skills.sh Propagation

After adding a new skill directory with SKILL.md, run scripts/sync-skills.sh from the bigpowers repo root. This automatically generates:

• .cursor/rules/<name>.mdc — for Cursor
• .gemini/extensions/bigpowers/skills/<name>/SKILL.md — Agent Skill
• .gemini/extensions/bigpowers/commands/<name>.toml — Slash Command
• .gemini/extensions/bigpowers/commands/prompts/<name>.md — Command Prompt
• Updated gemini-extension.json

verify: bash scripts/sync-skills.sh 2>&1 | grep "skills synced"