agent-builder
Agent Builder
A comprehensive guide for creating custom agents in Claude Code. Agents are specialized AI assistants that run in separate context windows, enabling focused, autonomous task execution.
Quick Reference
YAML Frontmatter Fields
| Field | Required | Description |
|---|---|---|
name |
Yes | Unique identifier (lowercase-with-hyphens) |
description |
Yes | When to invoke — critical for discovery |
tools |
No | Allowed tools (inherits all if omitted) |
model |
No | haiku, sonnet, opus, or inherit |
permissionMode |
No | default, acceptEdits, bypassPermissions, plan |
skills |
No | Auto-load Skills when agent starts |
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