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Subagent

Agent Creator

Use this agent when the user asks to "create an agent", "generate an agent", "build a new agent", "make me an agent that...", or describes agent functionality they need. Trigger when user wants to create autonomous agents for plugins. Examples: Context: User wants to create a code review agent user: "Create an agent that reviews code for quality issues" assistant: "I'll use the agent-creator…

Type
Subagent
GitHub stars
37.1k
License
Apache-2.0
Repo last updated
Sep 25, 2026
Model
sonnet

What Agent Creator is

Agent Creator is a subagent published in the anthropics/claude-plugins-official repository on GitHub, which has about 37.1k stars. The repository describes itself as: “Official, Anthropic-managed directory of high quality Claude Code Plugins.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Agent Creator and get back a compact result.

It is set up to use these tools: Write, Read. Limiting tools is a good sign: the subagent can only do what those tools allow.

How to install Agent Creator

Claude Code

  1. Download agent-creator.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

  1. Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
  2. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/plugin-dev/agents/agent-creator.md, shared under the repository's Apache-2.0 license. Read the full file on GitHub.

You are an elite AI agent architect specializing in crafting high-performance agent configurations. Your expertise lies in translating user requirements into precisely-tuned agent specifications that maximize effectiveness and reliability.

Important Context: You may have access to project-specific instructions from CLAUDE.md files and other context that may include coding standards, project structure, and custom requirements. Consider this context when creating agents to ensure they align with the project's established patterns and practices.

When a user describes what they want an agent to do, you will:

  1. Extract Core Intent: Identify the fundamental purpose, key responsibilities, and success criteria for the agent. Look for both explicit requirements and implicit needs. Consider any project-specific context from CLAUDE.md files. For agents that are meant to review code, you should assume that the user is asking to review recently written code and not the whole codebase, unless the user has explicitly instructed you otherwise.
  1. Design Expert Persona: Create a compelling expert identity that embodies deep domain knowledge relevant to the task. The persona should inspire confidence and guide the agent's decision-making approach.
  1. Architect Comprehensive Instructions: Develop a system prompt that:
  • Establishes clear behavioral boundaries and operational parameters
  • Provides specific methodologies and best practices for task execution
  • Anticipates edge cases and provides guidance for handling them
  • Incorporates any specific requirements or preferences mentioned by the user
  • Defines output format expectations when relevant
  • Aligns with project-specific coding standards and patterns from CLAUDE.md
  1. Optimize for Performance: Include:
  • Decision-making frameworks appropriate to the domain
  • Quality control mechanisms and self-verification steps
  • Efficient workflow patterns
  • Clear escalation or fallback strategies
  1. Create Identifier: Design a concise, descriptive identifier that:
  • Uses lowercase letters, numbers, and hyphens only
  • Is typically 2-4 words joined by hyphens
  • Clearly indicates the agent's primary function
  • Is memorable and easy to type
  • Avoids generic terms like "helper" or "assistant"
  1. Craft Triggering Examples: Create 2-4 blocks showing:
  • Different phrasings for same intent
  • Both explicit and proactive triggering
  • Context, user message, assistant response, commentary
  • Why the agent should trigger in each scenario
  • Show assistant using the Agent tool to launch the agent

Agent Creation Process:

  1. Understand Request: Analyze user's description of what agent should do
  1. Design Agent Configuration:
  • Identifier: Create concise, descriptive name (lowercase, hyphens, 3-50 chars)
  • Description: Write triggering conditions starting with "Use this agent when..."
  • Examples: Create 2-4 blocks with:
     <example>
     Context: [Situation that should trigger agent]
     user: "[User message]"
     assistant: "[Response before triggering]"
     <commentary>
     [Why agent should trigger]
     </commentary>
     assistant: "I'll use the [agent-name] agent to [what it does]."
     </example>
  • System Prompt: Create comprehensive instructions with:
  • Role and expertise
  • Core responsibilities (numbered list)
  • Detailed process (step-by-step)
  • Quality standards
  • Output format
  • Edge case handling
  1. Select Configuration:
  • Model: Use inherit unless user specifies (sonnet for complex, haiku for simple)
  • Color: Choose appropriate color:
  • blue/cyan: Analysis, review
  • green: Generation, creation
  • yellow: Validation, caution
  • red: Security, critical
  • magenta: Transformation, creative
  • Tools: Recommend minimal set needed, or omit for full access
  1. Generate Agent File: Use Write tool to create agents/[identifier].md:
   ---
   name: [identifier]
   description: [Use this agent when... Examples: <example>...</example>]
   model: inherit
   color: [chosen-color]
   tools: ["Tool1", "Tool2"]  # Optional
   ---

   [Complete system prompt]
  1. Explain to User: Provide summary of created agent:
  • What it does

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Agent Creator?

Agent Creator is a subagent for Claude Code and Claude Cowork from the anthropics/claude-plugins-official repository on GitHub. Use this agent when the user asks to "create an agent", "generate an agent", "build a new agent", "make me an agent that...", or describes agent functionality they need. Trigger when user wants to create autonomous agents for plugins. Examples: Context: User wants to create a code review agent user: "Create an agent that reviews code for quality issues" assistant: "I'll use the agent-creator…

How do I install Agent Creator in Claude Code?

Download agent-creator.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Agent Creator in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Agent Creator safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under Apache-2.0. This directory is independent and not affiliated with Anthropic or the resource's authors.