SKILL.md

name: subagents-creator description: Guide for creating Claude Code subagents (custom agents) - specialized AI assistants with isolated context. Use when the user wants to create, add, or configure a subagent/custom agent for Claude Code.

Subagents Creator

Create Claude Code subagents - specialized AI assistants that run in isolated context windows.

What Subagents Provide

Benefit	Description
Context Isolation	Each subagent has its own context, preventing main conversation pollution
Specialized Expertise	Fine-tuned instructions for specific domains
Reusability	Use across projects, share with team
Flexible Permissions	Different tool access per subagent
Parallelization	Multiple subagents can run concurrently

Workflow

Step 1: Determine Subagent Requirements

Ask the user:

What should this subagent do? (its specialty/purpose)
What tools does it need? (see Available Tools below)
When should it be triggered? (automatic vs explicit invocation)

Step 2: Determine Installation Scope

Ask where to install the subagent:

Scope	Path	Use Case
Project	`.claude/agents/`	Team-shared, committed to git
User global	`~/.claude/agents/`	Personal agents for all projects
User profile	`~/.claude-<profile>/agents/`	Profile-specific agents

For user-level agents, ask which profile or if using default ~/.claude/.

Step 3: Create the Subagent

File Format

Create a Markdown file with YAML frontmatter:

---
name: agent-name
description: When this agent should be invoked. Use "proactively" to encourage automatic use.
tools: Read, Grep, Glob, Bash
model: sonnet
---

Your agent's system prompt goes here. Define its role, capabilities,
approach, and any specific instructions or constraints.

Configuration Fields

Field	Required	Description
`name`	Yes	Lowercase with hyphens (e.g., `code-reviewer`)
`description`	Yes	When to invoke. Include "proactively" or "MUST BE USED" to encourage automatic delegation
`tools`	No	Comma-separated list. Inherits all tools if omitted
`model`	No	`sonnet`, `opus`, `haiku`, or `inherit`. Default: `sonnet`
`permissionMode`	No	`default`, `acceptEdits`, `bypassPermissions`, `plan`
`skills`	No	Comma-separated skill names to auto-load

Step 4: Write Effective Prompts

Include in the system prompt:

Role definition - Who the agent is
Trigger behavior - What to do when invoked
Process/checklist - Steps to follow
Output format - How to present results
Constraints - What NOT to do

See references/examples.md for complete working examples.

Available Tools

Read-Only:

Read - Read file contents
Glob - File pattern matching
Grep - Content search with regex

Execution:

Bash - Shell commands
Edit - Targeted file edits
Write - Create/overwrite files

Search:

WebFetch - Fetch URL content
WebSearch - Web searches

Other:

Skill - Execute skills
SlashCommand - Run slash commands

NOT Available: Task (prevents nested agent spawning)

Built-In Subagents

Agent	Model	Tools	Purpose
general-purpose	Sonnet	All	Complex multi-step tasks
Plan	Sonnet	Read, Glob, Grep, Bash (read-only)	Codebase research in plan mode
Explore	Haiku	Glob, Grep, Read, Bash (read-only)	Fast codebase searching

Invocation Methods

Automatic - Claude delegates based on task matching description
Explicit - User mentions agent: "Use the code-reviewer agent..."
CLI flag - claude --agents '{...}' for session-only agents

Best Practices

Focused purpose - Single clear responsibility per agent
Detailed prompts - Include specific instructions, examples, constraints
Minimal tools - Only grant necessary tools
Action-oriented descriptions - Help Claude match tasks appropriately
Version control - Commit project agents for team sharing

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