Skill, Subagent & Slash Command Builder

Author Claude Code Agent Skills, custom subagents and slash commands with valid frontmatter, descriptions that trigger reliably, and a best-practice structure.

Presets

Location

Agent Skill

Skills are folders of instructions Claude loads on demand. Only the name and description sit in context until the skill is needed, so the description must say what it does and when to use it.

NameLowercase letters, numbers and hyphens · max 64 charactersDescription0 / 1024 charactersAllowed tools (optional)Tools Claude may use without asking while the skill is active.OverviewInstructions (one step per line)ExamplesGuidelines (one per line)Supporting files (one per line: path — description)Keep SKILL.md lean; put long reference material in separate files that Claude reads only when needed.

SKILL.md

~15 tokens

Save to .claude/skills/my-skill/SKILL.md

---
name: my-skill
description: ""
---

# My Skill

Create the file

mkdir -p .claude/skills/my-skill && touch .claude/skills/my-skill/SKILL.md

Checks

✗Name is required.

✗Description is required — Claude uses it to decide when to load the skill.

!Add instructions — numbered steps make skills far more reliable.