Gmail Server for Model Context Protocol (MCP)

This MCP server integrates with Gmail to enable sending, removing, reading, drafting, and responding to emails.

Note: This server enables an MCP client to read, remove, and send emails. However, the client prompts the user before conducting such activities.

https://github.com/user-attachments/assets/5794cd16-00d2-45a2-884a-8ba0c3a90c90

Components

Tools

send-email
- Sends email to email address recipient
- Input:
  - recipient_id (string): Email address of addressee
  - subject (string): Email subject
  - message (string): Email content
- Returns status and message_id
trash-email
- Moves email to trash
- Input:
  - email_id (string): Auto-generated ID of email
- Returns success message
mark-email-as-read
- Marks email as read
- Input:
  - email_id (string): Auto-generated ID of email
- Returns success message
get-unread-emails
- Retrieves unread emails
- Returns list of emails including email ID
read-email
- Retrieves given email content
- Input:
  - email_id (string): Auto-generated ID of email
- Returns dictionary of email metadata and marks email as read
open-email
- Open email in browser
- Input:
  - email_id (string): Auto-generated ID of email
- Returns success message and opens given email in default browser

Setup

Gmail API Setup

Create a new Google Cloud project
Enable the Gmail API
Configure an OAuth consent screen
- Select "external". However, we will not publish the app.
- Add your personal email address as a "Test user".
Add OAuth scope https://www.googleapis.com/auth/gmail/modify
Create an OAuth Client ID for application type "Desktop App"
Download the JSON file of your client's OAuth keys
Rename the key file and save it to your local machine in a secure location. Take note of the location.
- The absolute path to this file will be passed as parameter --creds-file-path when the server is started.

Authentication

When the server is started, an authentication flow will be launched in your system browser. Token credentials will be subsequently saved (and later retrieved) in the absolute file path passed to parameter --token-path.

For example, you may use a dot directory in your home folder, replacing [your-home-folder].:

Parameter	Example
`--creds-file-path`	`/[your-home-folder]/.google/client_creds.json`
`--token-path`	`/[your-home-folder]/.google/app_tokens.json`

Usage with Desktop App

Using uv is recommended.

To integrate this server with Claude Desktop as the MCP Client, add the following to your app's server configuration. By default, this is stored as ~/Library/Application\ Support/Claude/claude_desktop_config.json.

{
  "mcpServers": {
    "gdrive": {
      "command": "uv",
      "args": [
        "--directory",
        "[absolute-path-to-git-repo]",
        "run",
        "gmail",
        "--creds-file-path",
        "[absolute-path-to-credentials-file]",
        "--token-path",
        "[absolute-path-to-access-tokens-file]"
      ]
    }
  }
}

The following parameters must be set

Parameter	Example
`--directory`	Absolute path to `gmail` directory containing server
`--creds-file-path`	Absolute path to credentials file created in Gmail API Setup.
`--token-path`	Absolute path to store and retrieve access and refresh tokens for application.

Troubleshooting with MCP Inspector

To test the server, use MCP Inspector. From the git repo, run the below changing the parameter arguments accordingly.

npx @modelcontextprotocol/inspector uv run [absolute-path-to-git-repo]/src/gmail/server.py --creds-file-path [absolute-path-to-credentials-file] --token-path [absolute-path-to-access-tokens-file]