/skill-builder

name: skill-builder
description: Create Agent Skills with best practices, structure, validation, and testing. Use when designing or refining skills, prompts, references, or supporting files.
disable-model-invocation: true

Skill Builder

Create, validate, and refine Agent Skills.

Quick Start

1. Gather the capability, triggers, and required domain knowledge. 2. Choose a simple single-file skill or a multi-file skill with references. 3. Write `SKILL.md` with concise, trigger-focused instructions. 4. Add reference files only for detail that would otherwise bloat `SKILL.md`. 5. Validate YAML frontmatter, file layout, and naming. 6. Test the skill with the natural language users are likely to say.

Workflow

• Start with requirements and scope control.
• Design the structure before writing content.
• Keep descriptions in third person and include trigger keywords.
• Use progressive disclosure for long examples, templates, and validation details.

Gates

Follow in order. **Pass** means a check you can satisfy with concrete artifacts (written bullets, paths, line counts, parsed YAML)—not an internal sense of “done.”

1. **Requirements** — **Pass:** Capability, triggers, and any required domain knowledge (or explicit “none”) are written down or confirmed from the user. 2. **Structure** — **Pass:** Single-file vs `SKILL.md` + `references/` is chosen; heavy detail lives in references, not inlined in `SKILL.md`. 3. **Draft** — **Pass:** Frontmatter is valid YAML with `name` and `description`; `SKILL.md` is ≤ 500 lines; every relative link from `SKILL.md` resolves to a path that exists under this skill directory; each `allowed-tools` entry (if present) is justified. 4. **Trigger check** — **Pass:** At least one natural-language user phrase plausibly matching the `description` is identified for a quick invocation test.

Validation

• Keep `SKILL.md` under 500 lines.
• Prefer one-level reference links.
• Avoid time-sensitive guidance.
• Confirm frontmatter is valid YAML.
• Check that any `allowed-tools` entries are necessary and correct.

Advanced Reference

For the full workflow, templates, examples, and validation checklist, see [references/skill-builder-guide.md](references/skill-builder-guide.md).