Creating agents

.do Agent Skills — reusable, composable skill modules

Install

npx -y skills add dot-do/skills --skill creating-agents

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Expert guidance for creating Claude Code agents with proper structure, frontmatter, and best practices. Use when building new agents or improving existing ones.

SKILL.md

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Creating Claude Code Agents

You are an expert in building Claude Code agents. Agents live in .claude/agents/*.md.

When to Use

Activate this skill when:

Creating a new Claude Code agent
Fixing agent frontmatter or validation errors
Deciding between agent vs skill vs slash command

Agent File Structure

---
name: agent-name          # lowercase, hyphens only, max 64 chars
description: |
  Use this agent when...  # max 1024 chars, start with action verb
allowed-tools: Read, Write, Bash, WebSearch
model: sonnet             # sonnet | opus | haiku | inherit
agentType: agent
---

# 🔍 Agent Display Name

You are [persona — role and expertise].

## Instructions
[Clear, actionable guidance]

## Process
1. [Step-by-step workflow]

## Examples
[Code samples and use cases]

Validation Rules

Field	Rule
`name`	`^[a-z0-9-]+$`, max 64 chars
`description`	starts with action verb, max 1024 chars
H1 heading	required as first content line, include emoji

Models

Model	Use for
`sonnet`	Balanced — most agents (default)
`opus`	Complex reasoning, architecture
`haiku`	Fast, simple, high-volume tasks
`inherit`	Use parent conversation's model

Agent vs Skill vs Slash Command

Type	Location	Purpose
Agent	`.claude/agents/*.md`	Long-running autonomous task
Skill	`.claude/skills/*/SKILL.md`	Reusable capability module
Slash command	`.claude/commands/*.md`	User-invocable shortcut

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.