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Roo Code Custom Mode Editor MCP Server

@raymondlowe

Repository

Basic information

Category

Developer Tools

Transports

stdio

Author

raymondlowe

About Roo Code Custom Mode Editor MCP Server

An MCP server that knows how to edit the Roo Code custom modes file

Roo Code Custom Mode Editor MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "roo-code-custom-mode-editor-mcp-server": {
      "command": "npx",
      "args": [
        "https://github.com/raymondlowe/roo-code-custom-mode-editor-mcp-server"
      ]
    }
  }
}

Roo Code Custom Mode Editor MCP Server tools

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Overview

What is roo-code-custom-mode-editor-mcp-server?

A Model Context Protocol (MCP) server that provides tools to read and modify the Roo Code custom modes file (.roomodes). It eliminates the need to overwrite the file manually or attempt unreliable JSON diffs. Designed for developers using Roo Code who want a safe, structured way to manage custom mode definitions.

How to use roo-code-custom-mode-editor-mcp-server?

Run the server with npx https://github.com/raymondlowe/roo-code-custom-mode-editor-mcp-server. To integrate with Roo Code, add a server configuration entry to the MCP settings file pointing to the built index.js (the server has a build step via npm run build). The server communicates over stdio and exposes four tools: list_custom_modes, create_custom_mode, get_custom_mode_fields, and put_custom_mode_fields.

Key features of roo-code-custom-mode-editor-mcp-server

  • Lists all custom modes in the .roomodes file.
  • Creates new custom modes with slug, name, roleDefinition, customInstructions, and groups.
  • Retrieves the full fields of a specific custom mode.
  • Updates one or more fields of a custom mode without rewriting the entire file.

Use cases of roo-code-custom-mode-editor-mcp-server

  • List all existing custom modes to review current configuration.
  • Create a new custom mode programmatically via an MCP tool.
  • Update only the role definition or instructions of a mode without risking file corruption.
  • Avoid manual file writes and unreliable diff edits when managing .roomodes.

Frequently asked questions

1

What runtime does the server require?

The server is launched with the `node` command, so Node.js must be installed.

2

How does this server differ from directly editing the `.roomodes` file?

It provides dedicated MCP tools to list, create, retrieve, and update custom modes, avoiding the need to overwrite the file or attempt unreliable JSON diffs.

3

Where does the custom mode data live?

All data is stored in the `.roomodes` file managed by Roo Code.

4

What tools are exposed?

The server exposes four tools: `list_custom_modes`, `create_custom_mode`, `get_custom_mode_fields`, and `put_custom_mode_fields`. Each accepts specific parameters (e.g., slug, name, roleDefinition, customInstructions, groups).

5

How do I configure this server with Roo Code?

Add a JSON object under `mcpServers` in the MCP settings file, specifying `"command": "node"

Comments

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