Sub Agents MCP — AI skill for Claude Code

Sub-Agents MCP Server

[](https://www.npmjs.com/package/sub-agents-mcp) [](https://opensource.org/licenses/MIT)

Run reusable coding agents from any MCP-compatible client.

Write a reviewer, test writer, or investigator in Markdown, then ask your assistant to use it. The MCP server runs that agent with the coding CLI you choose and returns the result to the same conversation.

What You Can Do

• Delegate code review, test writing, investigation, and documentation to focused agents
• Reuse the same agent definitions across MCP clients with one shared backend and model configuration
• Continue the same agent across multiple calls for longer work

Quick Start

You need Node.js 22 or later, an MCP-compatible client, and one supported coding CLI installed and signed in. This example uses Codex.

1. Create an Agent

Create an agents folder anywhere on your machine, then add `code-reviewer.md`:

# Code Reviewer

Review code for bugs and maintainability issues.

## Task

- Find concrete problems in the requested changes
- Explain why each problem matters
- Point to the affected code

## Done When

- All requested files have been reviewed
- Findings include evidence and suggested next steps

The filename becomes the agent name: `code-reviewer.md` becomes `code-reviewer`.

2. Add the MCP Server

Add the server to your client's MCP configuration. Replace `AGENTS_DIR` with the absolute path to the folder you created.

{
  "mcpServers": {
    "sub-agents": {
      "command": "npx",
      "args": ["-y", "sub-agents-mcp"],
      "env": {
        "AGENTS_DIR": "/absolute/path/to/agents",
        "AGENT_TYPE": "codex"
      }
    }
  }
}

Restart or reconnect your MCP client after saving the configuration.

3. Run the Agent

Ask your assistant:

Use the code-reviewer agent to review the authenticati