Agentmail MCP

AgentMail MCP Server

Connect AgentMail to any MCP-compatible AI client. Three setup options available.

Prerequisites

Get your API key from console.agentmail.to.

Option 1: Remote MCP (Simplest)

No installation required. Connect directly to the hosted MCP server.

URL: https://mcp.agentmail.to

Authentication: OAuth 2.0 via Smithery. The remote server does NOT accept an API key in env — it returns 401 Bearer error="invalid_token" and redirects your MCP client through the OAuth authorization server at https://auth.smithery.ai/agentmail. The MCP client handles the browser-based consent flow automatically on first connect.

Add to your MCP client configuration:

{
  "mcpServers": {
    "AgentMail": {
      "url": "https://mcp.agentmail.to"
    }
  }
}

On first use, your MCP client opens a browser window to complete the Smithery OAuth flow; after approval, tokens are cached by the client. If you need API-key auth (no OAuth flow), use Option 2 or Option 3 below instead.

Option 2: Local npm Package

Run the MCP server locally via npx.

{
  "mcpServers": {
    "AgentMail": {
      "command": "npx",
      "args": ["-y", "agentmail-mcp"],
      "env": {
        "AGENTMAIL_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Tool Selection

Load only specific tools with the --tools argument:

{
  "mcpServers": {
    "AgentMail": {
      "command": "npx",
      "args": [
        "-y",
        "agentmail-mcp",
        "--tools",
        "send_message,reply_to_message,list_inboxes"
      ],
      "env": {
        "AGENTMAIL_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Option 3: Local Python Package

Install and run the Python MCP server.

pip install agentmail-mcp

Claude Desktop

Config location:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json

The server accepts the API key in two ways: via AGENTMAIL_API_KEY env var, or via the --api-key CLI flag. Use whichever works in your MCP client's launcher environment.

{
  "mcpServers": {
    "AgentMail": {
      "command": "/path/to/your/.venv/bin/agentmail-mcp",
      "env": {
        "AGENTMAIL_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

If env vars don't propagate through your MCP launcher, pass the key as an argument instead:

{
  "mcpServers": {
    "AgentMail": {
      "command": "/path/to/your/.venv/bin/agentmail-mcp",
      "args": ["--api-key", "YOUR_API_KEY"]
    }
  }
}

Find your path:

# Activate your virtual environment, then:
which agentmail-mcp

Run Standalone

# Option A: env var
export AGENTMAIL_API_KEY=your-api-key
agentmail-mcp

# Option B: CLI flag (useful if env vars aren't available)
agentmail-mcp --api-key="your-api-key"

Available Tools

The Node MCP server (npx agentmail-mcp, Option 1 and Option 2) exposes 17 tools:

The legacy Python MCP server (pip install agentmail-mcp, Option 3) is a separate codebase with a smaller tool set — it omits the six *_draft tools above. For new projects, prefer the Node server (Option 1 or Option 2) for full parity with the toolkit.

Client Configuration

Cursor, VS Code, Windsurf

Add the same MCP server entry in your client config file:

Cursor: .cursor/mcp.json
VS Code: .vscode/mcp.json
Windsurf: MCP config file

{
  "mcpServers": {
    "AgentMail": {
      "command": "npx",
      "args": ["-y", "agentmail-mcp"],
      "env": {
        "AGENTMAIL_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Compatible Clients

The AgentMail MCP server works with any MCP-compatible client:

• Claude Desktop
• Cursor
• VS Code
• Windsurf
• Cline
• Goose
• Raycast
• ChatGPT
• Amazon Q
• Codex
• Gemini CLI
• LibreChat
• Roo Code
• And more...

Example Usage

Once configured, you can ask your AI assistant:

• "Create a new inbox for support emails"
• "Send an email to john@example.com with subject 'Hello'"
• "Check my inbox for new messages"
• "Reply to the latest email thanking them"
• "List all my email threads"
• "Download the attachment from the last message"

Troubleshooting

"Command not found"

Ensure npm/npx is in your PATH, or use the full path:

"command": "/usr/local/bin/npx"

"Invalid API key"

Verify your API key is correct and has the necessary permissions.

Python package not found

Use the full path to the agentmail-mcp executable in your virtual environment:

# Find the path
source /path/to/venv/bin/activate
which agentmail-mcp