Using MCP in Roo Code

Model Context Protocol (MCP) extends Roo Code's capabilities by connecting to external tools and services. This guide covers everything you need to know about using MCP with Roo Code.

Configuring MCP Servers

MCP server configurations can be managed at two levels:

1. Global Configuration: Stored in the mcp_settings.json file, accessible via VS Code settings (see below). These settings apply across all your workspaces unless overridden by a project-level configuration.
2. Project-level Configuration: Defined in a .roo/mcp.json file within your project's root directory. This allows you to set up project-specific servers and share configurations with your team by committing the file to version control. Roo Code automatically detects and loads this file if it exists.

Precedence: If a server name exists in both global and project configurations, the project-level configuration takes precedence.

Editing MCP Settings Files

You can edit both global and project-level MCP configuration files directly from the Roo Code MCP settings view:

1. Click the icon in the top navigation of the Roo Code pane.

2. Scroll to the bottom of the MCP settings view.
3. Click the appropriate button:
   • Edit Global MCP: Opens the global mcp_settings.json file.
   • Edit Project MCP: Opens the project-specific .roo/mcp.json file. If this file doesn't exist, Roo Code will create it for you.

Both files use a JSON format with a mcpServers object containing named server configurations:

{
  "mcpServers": {
    "server1": {
      "command": "python",
      "args": ["/path/to/server.py"],
      "env": {
        "API_KEY": "your_api_key"
      },
      "alwaysAllow": ["tool1", "tool2"],
      "disabled": false
    }
  }
}

Example of MCP Server config in Roo Code (STDIO Transport)

Understanding Transport Types

MCP supports two transport types for server communication:

STDIO Transport

Used for local servers running on your machine:

• Communicates via standard input/output streams
• Lower latency (no network overhead)
• Better security (no network exposure)
• Simpler setup (no HTTP server needed)
• Runs as a child process on your machine

For more in-depth information about how STDIO transport works, see STDIO Transport.

STDIO configuration example:

{
  "mcpServers": {
    "local-server": {
      "command": "node",
      "args": ["/path/to/server.js"],
      "env": {
        "API_KEY": "your_api_key"
      },
      "alwaysAllow": ["tool1", "tool2"],
      "disabled": false
    }
  }
}

SSE Transport

Used for remote servers accessed over HTTP/HTTPS:

• Communicates via Server-Sent Events protocol
• Can be hosted on a different machine
• Supports multiple client connections
• Requires network access
• Allows centralized deployment and management

For more in-depth information about how SSE transport works, see SSE Transport.

SSE configuration example:

{
  "mcpServers": {
    "remote-server": {
      "url": "https://your-server-url.com/mcp",
      "headers": {
        "Authorization": "Bearer your-token"
      },
      "alwaysAllow": ["tool3"],
      "disabled": false
    }
  }
}

Enabling or Disabling MCP Servers

Disabling your MCP Servers here will remove all MCP related logic and definitions from your system prompt, reducing your token usage. This will prevent Roo Code from connecting to any MCP servers, and the use_mcp_tool and access_mcp_resource tools will not be available. Check this off if you don't intend to use MCP Servers. This is on by default.

1. Click the icon in the top navigation of the Roo Code pane
2. Check/Uncheck Enable MCP Servers

Enabling or Disabling MCP Server Creation

Disabling your MCP Server Creation here will just remove the instructions from your system prompt that Roo Code uses to write MCP servers while not removing the context related to operating them. This reduces token usage. This is on by default.

1. Click the icon in the top navigation of the Roo Code pane
2. Check/Uncheck Enable MCP Server Creation

Managing Individual MCP Servers

Each MCP server has its own configuration panel where you can modify settings, manage tools, and control its operation. To access these settings:

1. Click the icon in the top navigation of the Roo Code pane
2. Locate the MCP server you want to manage in the list

Deleting a Server

1. Press the next to the MCP server you would like to delete
2. Press the Delete button on the confirmation box

Restarting a Server

1. Press the button next to the MCP server you would like to restart

Enabling or Disabling a Server

1. Press the toggle switch next to the MCP server to enable/disable it

Network Timeout

To set the maximum time to wait for a response after a tool call to the MCP server:

1. Click the Network Timeout pulldown at the bottom of the individual MCP server's config box and change the time. Default is 1 minute but it can be set between 30 seconds and 5 minutes.

Auto Approve Tools

MCP tool auto-approval works on a per-tool basis and is disabled by default. To configure auto-approval:

1. First enable the global "Use MCP servers" auto-approval option in auto-approving-actions
2. In the MCP server settings, locate the specific tool you want to auto-approve
3. Check the Always allow checkbox next to the tool name

When enabled, Roo Code will automatically approve this specific tool without prompting. Note that the global "Use MCP servers" setting takes precedence - if it's disabled, no MCP tools will be auto-approved.

Finding and Installing MCP Servers

Roo Code does not come with any pre-installed MCP servers. You'll need to find and install them separately.

• Community Repositories: Check for community-maintained lists of MCP servers on GitHub
• Ask Roo: You can ask Roo Code to help you find or even create MCP servers (when "Enable MCP Server Creation" is enabled)
• Build Your Own: Create custom MCP servers using the SDK to extend Roo Code with your own tools

For full SDK documentation, visit the MCP GitHub repository.

Using MCP Tools in Your Workflow

After configuring an MCP server, Roo will automatically detect available tools and resources. To use them:

1. Type your request in the Roo Code chat interface
2. Roo will identify when an MCP tool can help with your task
3. Approve the tool use when prompted (or use auto-approval)

Example: "Analyze the performance of my API" might use an MCP tool that tests API endpoints.

Troubleshooting MCP Servers

Common issues and solutions:

• Server Not Responding: Check if the server process is running and verify network connectivity
• Permission Errors: Ensure proper API keys and credentials are configured in your mcp_settings.json (for global settings) or .roo/mcp.json (for project settings).
• Tool Not Available: Confirm the server is properly implementing the tool and it's not disabled in settings
• Slow Performance: Try adjusting the network timeout value for the specific MCP server