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/skill-builder

Create Agent Skills with best practices, structure, validation, and testing. Use when designing or refining skills, prompts, references, or supporting files.

From plugin
beagle
82139 skills2 commands
Install
$ npx -y skills add existential-birds/beagle --skill skill-builder --agent claude-code

How it fires

How this skill gets triggered: by you, by Claude, or both.

  • Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
  • You can call itInvoke it directly when you want it.
  • Slash command/skill-builder

Context preview

The summary Claude sees to decide when to auto-load this skill.

Create Agent Skills with best practices, structure, validation, and testing. Use when designing or refining skills, prompts, references, or supporting files.

SKILL.md

skill-builder.SKILL.md
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).

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