Gmail AutoAuth MCP Server
A Model Context Protocol (MCP) server for Gmail integration in Claude Desktop with auto authentication support. This server enables AI assistants to manage Gmail through natural language interactions.
Features
- Send emails with subject, content, attachments, and recipients
- Full attachment support - send and receive file attachments
- Download email attachments to local filesystem
- Support for HTML emails and multipart messages with both HTML and plain text versions
- Full support for international characters in subject lines and email content
- Read email messages by ID with advanced MIME structure handling
- Enhanced attachment display showing filenames, types, sizes, and download IDs
- Search emails with various criteria (subject, sender, date range)
- Comprehensive label management with ability to create, update, delete and list labels
- List all available Gmail labels (system and user-defined)
- List emails in inbox, sent, or custom labels
- Mark emails as read/unread
- Move emails to different labels/folders
- Delete emails
- Batch operations for efficiently processing multiple emails at once
- Full integration with Gmail API
- Simple OAuth2 authentication flow with auto browser launch
- Support for both Desktop and Web application credentials
- Global credential storage for convenience
Installation & Authentication
Installing via Smithery
To install Gmail AutoAuth for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install @gongrzhe/server-gmail-autoauth-mcp --client claude
Installing Manually
-
Create a Google Cloud Project and obtain credentials:
a. Create a Google Cloud Project:
- Go to Google Cloud Console
- Create a new project or select an existing one
- Enable the Gmail API for your project
b. Create OAuth 2.0 Credentials:
- Go to "APIs & Services" > "Credentials"
- Click "Create Credentials" > "OAuth client ID"
- Choose either "Desktop app" or "Web application" as application type
- Give it a name and click "Create"
- For Web application, add
http://localhost:3000/oauth2callbackto the authorized redirect URIs - Download the JSON file of your client's OAuth keys
- Rename the key file to
gcp-oauth.keys.json
-
Run Authentication:
You can authenticate in two ways:
a. Global Authentication (Recommended):
# First time: Place gcp-oauth.keys.json in your home directory's .gmail-mcp folder mkdir -p ~/.gmail-mcp mv gcp-oauth.keys.json ~/.gmail-mcp/ # Run authentication from anywhere npx @gongrzhe/server-gmail-autoauth-mcp authb. Local Authentication:
# Place gcp-oauth.keys.json in your current directory # The file will be automatically copied to global config npx @gongrzhe/server-gmail-autoauth-mcp authThe authentication process will:
- Look for
gcp-oauth.keys.jsonin the current directory or~/.gmail-mcp/ - If found in current directory, copy it to
~/.gmail-mcp/ - Open your default browser for Google authentication
- Save credentials as
~/.gmail-mcp/credentials.json
Note:
- After successful authentication, credentials are stored globally in
~/.gmail-mcp/and can be used from any directory - Both Desktop app and Web application credentials are supported
- For Web application credentials, make sure to add
http://localhost:3000/oauth2callbackto your authorized redirect URIs
- Look for
-
Configure in Claude Desktop:
{
"mcpServers": {
"gmail": {
"command": "npx",
"args": [
"@gongrzhe/server-gmail-autoauth-mcp"
]
}
}
}
Docker Support
If you prefer using Docker:
- Authentication:
docker run -i --rm \
--mount type=bind,source=/path/to/gcp-oauth.keys.json,target=/gcp-oauth.keys.json \
-v mcp-gmail:/gmail-server \
-e GMAIL_OAUTH_PATH=/gcp-oauth.keys.json \
-e "GMAIL_CREDENTIALS_PATH=/gmail-server/credentials.json" \
-p 3000:3000 \
mcp/gmail auth
- Usage:
{
"mcpServers": {
"gmail": {
"command": "docker",
"args": [
"run",
"-i",
"--rm",
"-v",
"mcp-gmail:/gmail-server",
"-e",
"GMAIL_CREDENTIALS_PATH=/gmail-server/credentials.json",
"mcp/gmail"
]
}
}
}
Cloud Server Authentication
For cloud server environments (like n8n), you can specify a custom callback URL during authentication:
npx @gongrzhe/server-gmail-autoauth-mcp auth https://gmail.gongrzhe.com/oauth2callback
Setup Instructions for Cloud Environment
-
Configure Reverse Proxy:
- Set up your n8n container to expose a port for authentication
- Configure a reverse proxy to forward traffic from your domain (e.g.,
gmail.gongrzhe.com) to this port
-
DNS Configuration:
- Add an A record in your DNS settings to resolve your domain to your cloud server's IP address
-
Google Cloud Platform Setup:
- In your Google Cloud Console, add your custom domain callback URL (e.g.,
https://gmail.gongrzhe.com/oauth2callback) to the authorized redirect URIs list
- In your Google Cloud Console, add your custom domain callback URL (e.g.,
-
Run Authentication:
npx @gongrzhe/server-gmail-autoauth-mcp auth https://gmail.gongrzhe.com/oauth2callback -
Configure in your application:
{ "mcpServers": { "gmail": { "command": "npx", "args": [ "@gongrzhe/server-gmail-autoauth-mcp" ] } } }
This approach allows authentication flows to work properly in environments where localhost isn't accessible, such as containerized applications or cloud servers.
Available Tools
The server provides the following tools that can be used through Claude Desktop:
1. Send Email (send_email)
Sends a new email immediately. Supports plain text, HTML, or multipart emails with optional file attachments.
Basic Email:
{
"to": ["recipient@example.com"],
"subject": "Meeting Tomorrow",
"body": "Hi,\n\nJust a reminder about our meeting tomorrow at 10 AM.\n\nBest regards",
"cc": ["cc@example.com"],
"bcc": ["bcc@example.com"],
"mimeType": "text/plain"
}
Email with Attachments:
{
"to": ["recipient@example.com"],
"subject": "Project Files",
"body": "Hi,\n\nPlease find the project files attached.\n\nBest regards",
"attachments": [
"/path/to/document.pdf",
"/path/to/spreadsheet.xlsx",
"/path/to/presentation.pptx"
]
}
HTML Email Example:
{
"to": ["recipient@example.com"],
"subject": "Meeting Tomorrow",
"mimeType": "text/html",
"body": "<html><body><h1>Meeting Reminder</h1><p>Just a reminder about our <b>meeting tomorrow</b> at 10 AM.</p><p>Best regards</p></body></html>"
}
Multipart Email Example (HTML + Plain Text):
{
"to": ["recipient@example.com"],
"subject": "Meeting Tomorrow",
"mimeType": "multipart/alternative",
"body": "Hi,\n\nJust a reminder about our meeting tomorrow at 10 AM.\n\nBest regards",
"htmlBody": "<html><body><h1>Meeting Reminder</h1><p>Just a reminder about our <b>meeting tomorrow</b> at 10 AM.</p><p>Best regards</p></body></html>"
}
2. Draft Email (draft_email)
Creates a draft email without sending it. Also supports attachments.
{
"to": ["recipient@example.com"],
"subject": "Draft Report",
"body": "Here's the draft report for your review.",
"cc": ["manager@example.com"],
"attachments": ["/path/to/draft_report.docx"]
}
3. Read Email (read_email)
Retrieves the content of a specific email by its ID. Now shows enhanced attachment information.
{
"messageId": "182ab45cd67ef"
}
Enhanced Response includes attachment details:
Subject: Project Files
From: sender@example.com
To: recipient@example.com
Date: Thu, 19 Jun 2025 10:30:00 -0400
Email body content here...
Attachments (2):
- document.pdf (application/pdf, 245 KB, ID: ANGjdJ9fkTs-i3GCQo5o97f_itG...)
- spreadsheet.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 89 KB, ID: BWHkeL8gkUt-j4HDRp6o98g_juI...)
4. Download Attachment (download_attachment)
NEW: Downloads email attachments to your local filesystem.
{
"messageId": "182ab45cd67ef",
"attachmentId": "ANGjdJ9fkTs-i3GCQo5o97f_itG...",
"savePath": "/path/to/downloads",
"filename": "downloaded_document.pdf"
}
Parameters:
messageId: The ID of the email containing the attachmentattachmentId: The attachment ID (shown in enhanced email display)savePath: Directory to save the file (optional, defaults to current directory)filename: Custom filename (optional, uses original filename if not provided)
5. Search Emails (search_emails)
Searches for emails using Gmail search syntax.
{
"query": "from:sender@example.com after:2024/01/01 has:attachment",
"maxResults": 10
}
6. Modify Email (modify_email)
Adds or removes labels from emails (move to different folders, archive, etc.).
{
"messageId": "182ab45cd67ef",
"addLabelIds": ["IMPORTANT"],
"removeLabelIds": ["INBOX"]
}
7. Delete Email (delete_email)
Permanently deletes an email.
{
"messageId": "182ab45cd67ef"
}
8. List Email Labels (list_email_labels)
Retrieves all available Gmail labels.
{}
9. Create Label (create_label)
Creates a new Gmail label.
{
"name": "Important Projects",
"messageListVisibility": "show",
"labelListVisibility": "labelShow"
}
10. Update Label (update_label)
Updates an existing Gmail label.
{
"id": "Label_1234567890",
"name": "Urgent Projects",
"messageListVisibility": "show",
"labelListVisibility": "labelShow"
}
11. Delete Label (delete_label)
Deletes a Gmail label.
{
"id": "Label_1234567890"
}
12. Get or Create Label (get_or_create_label)
Gets an existing label by name or creates it if it doesn't exist.
{
"name": "Project XYZ",
"messageListVisibility": "show",
"labelListVisibility": "labelShow"
}
13. Batch Modify Emails (batch_modify_emails)
Modifies labels for multiple emails in efficient batches.
{
"messageIds": ["182ab45cd67ef", "182ab45cd67eg", "182ab45cd67eh"],
"addLabelIds": ["IMPORTANT"],
"removeLabelIds": ["INBOX"],
"batchSize": 50
}
14. Batch Delete Emails (batch_delete_emails)
Permanently deletes multiple emails in efficient batches.
{
"messageIds": ["182ab45cd67ef", "182ab45cd67eg", "182ab45cd67eh"],
"batchSize": 50
}
14. Create Filter (create_filter)
Creates a new Gmail filter with custom criteria and actions.
{
"criteria": {
"from": "newsletter@company.com",
"hasAttachment": false
},
"action": {
"addLabelIds": ["Label_Newsletter"],
"removeLabelIds": ["INBOX"]
}
}
15. List Filters (list_filters)
Retrieves all Gmail filters.
{}
16. Get Filter (get_filter)
Gets details of a specific Gmail filter.
{
"filterId": "ANe1Bmj1234567890"
}
17. Delete Filter (delete_filter)
Deletes a Gmail filter.
{
"filterId": "ANe1Bmj1234567890"
}
18. Create Filter from Template (create_filter_from_template)
Creates a filter using pre-defined templates for common scenarios.
{
"template": "fromSender",
"parameters": {
"senderEmail": "notifications@github.com",
"labelIds": ["Label_GitHub"],
"archive": true
}
}
Filter Management Features
Filter Criteria
You can create filters based on various criteria:
| Criteria | Example | Description |
|---|---|---|
from | "sender@example.com" | Emails from a specific sender |
to | "recipient@example.com" | Emails sent to a specific recipient |
subject | "Meeting" | Emails with specific text in subject |
query | "has:attachment" | Gmail search query syntax |
negatedQuery | "spam" | Text that must NOT be present |
hasAttachment | true | Emails with attachments |
size | 10485760 | Email size in bytes |
sizeComparison | "larger" | Size comparison (larger, smaller) |
Filter Actions
Filters can perform the following actions:
| Action | Example | Description |
|---|---|---|
addLabelIds | ["IMPORTANT", "Label_Work"] | Add labels to matching emails |
removeLabelIds | ["INBOX", "UNREAD"] | Remove labels from matching emails |
forward | "backup@example.com" | Forward emails to another address |
Filter Templates
The server includes pre-built templates for common filtering scenarios:
1. From Sender Template (fromSender)
Filters emails from a specific sender and optionally archives them.
{
"template": "fromSender",
"parameters": {
"senderEmail": "newsletter@company.com",
"labelIds": ["Label_Newsletter"],
"archive": true
}
}
2. Subject Filter Template (withSubject)
Filters emails with specific subject text and optionally marks as read.
{
"template": "withSubject",
"parameters": {
"subjectText": "[URGENT]",
"labelIds": ["Label_Urgent"],
"markAsRead": false
}
}
3. Attachment Filter Template (withAttachments)
Filters all emails with attachments.
{
"template": "withAttachments",
"parameters": {
"labelIds": ["Label_Attachments"]
}
}
4. Large Email Template (largeEmails)
Filters emails larger than a specified size.
{
"template": "largeEmails",
"parameters": {
"sizeInBytes": 10485760,
"labelIds": ["Label_Large"]
}
}
5. Content Filter Template (containingText)
Filters emails containing specific text and optionally marks as important.
{
"template": "containingText",
"parameters": {
"searchText": "invoice",
"labelIds": ["Label_Finance"],
"markImportant": true
}
}
6. Mailing List Template (mailingList)
Filters mailing list emails and optionally archives them.
{
"template": "mailingList",
"parameters": {
"listIdentifier": "dev-team",
"labelIds": ["Label_DevTeam"],
"archive": true
}
}
Common Filter Examples
Here are some practical filter examples:
Auto-organize newsletters:
{
"criteria": {
"from": "newsletter@company.com"
},
"action": {
"addLabelIds": ["Label_Newsletter"],
"removeLabelIds": ["INBOX"]
}
}
Handle promotional emails:
{
"criteria": {
"query": "unsubscribe OR promotional"
},
"action": {
"addLabelIds": ["Label_Promotions"],
"removeLabelIds": ["INBOX", "UNREAD"]
}
}
Priority emails from boss:
{
"criteria": {
"from": "boss@company.com"
},
"action": {
"addLabelIds": ["IMPORTANT", "Label_Boss"]
}
}
Large attachments:
{
"criteria": {
"size": 10485760,
"sizeComparison": "larger",
"hasAttachment": true
},
"action": {
"addLabelIds": ["Label_LargeFiles"]
}
}
Advanced Search Syntax
The search_emails tool supports Gmail's powerful search operators:
| Operator | Example | Description |
|---|---|---|
from: | from:john@example.com | Emails from a specific sender |
to: | to:mary@example.com | Emails sent to a specific recipient |
subject: | subject:"meeting notes" | Emails with specific text in the subject |
has:attachment | has:attachment | Emails with attachments |
after: | after:2024/01/01 | Emails received after a date |
before: | before:2024/02/01 | Emails received before a date |
is: | is:unread | Emails with a specific state |
label: | label:work | Emails with a specific label |
You can combine multiple operators: from:john@example.com after:2024/01/01 has:attachment
Advanced Features
Email Attachment Support
The server provides comprehensive attachment functionality:
- Sending Attachments: Include file paths in the
attachmentsarray when sending or drafting emails - Attachment Detection: Automatically detects MIME types and file sizes
- Download Capability: Download any email attachment to your local filesystem
- Enhanced Display: View detailed attachment information including filenames, types, sizes, and download IDs
- Multiple Formats: Support for all common file types (documents, images, archives, etc.)
- RFC822 Compliance: Uses Nodemailer for proper MIME message formatting
Supported File Types: All standard file types including PDF, DOCX, XLSX, PPTX, images (PNG, JPG, GIF), archives (ZIP, RAR), and more.
Email Content Extraction
The server intelligently extracts email content from complex MIME structures:
- Prioritizes plain text content when available
- Falls back to HTML content if plain text is not available
- Handles multi-part MIME messages with nested parts
- Processes attachments information (filename, type, size, download ID)
- Preserves original email headers (From, To, Subject, Date)
International Character Support
The server fully supports non-ASCII characters in email subjects and content, including:
- Turkish, Chinese, Japanese, Korean, and other non-Latin alphabets
- Special characters and symbols
- Proper encoding ensures correct display in email clients
Comprehensive Label Management
The server provides a complete set of tools for managing Gmail labels:
- Create Labels: Create new labels with customizable visibility settings
- Update Labels: Rename labels or change their visibility settings
- Delete Labels: Remove user-created labels (system labels are protected)
- Find or Create: Get a label by name or automatically create it if not found
- List All Labels: View all system and user labels with detailed information
- Label Visibility Options: Control how labels appear in message and label lists
Label visibility settings include:
messageListVisibility: Controls whether the label appears in the message list (showorhide)labelListVisibility: Controls how the label appears in the label list (labelShow,labelShowIfUnread, orlabelHide)
These label management features enable sophisticated organization of emails directly through Claude, without needing to switch to the Gmail interface.
Batch Operations
The server includes efficient batch processing capabilities:
- Process up to 50 emails at once (configurable batch size)
- Automatic chunking of large email sets to avoid API limits
- Detailed success/failure reporting for each operation
- Graceful error handling with individual retries
- Perfect for bulk inbox management and organization tasks
Security Notes
- OAuth credentials are stored securely in your local environment (
~/.gmail-mcp/) - The server uses offline access to maintain persistent authentication
- Never share or commit your credentials to version control
- Regularly review and revoke unused access in your Google Account settings
- Credentials are stored globally but are only accessible by the current user
- Attachment files are processed locally and never stored permanently by the server
Troubleshooting
-
OAuth Keys Not Found
- Make sure
gcp-oauth.keys.jsonis in either your current directory or~/.gmail-mcp/ - Check file permissions
- Make sure
-
Invalid Credentials Format
- Ensure your OAuth keys file contains either
weborinstalledcredentials - For web applications, verify the redirect URI is correctly configured
- Ensure your OAuth keys file contains either
-
Port Already in Use
- If port 3000 is already in use, please free it up before running authentication
- You can find and stop the process using that port
-
Batch Operation Failures
- If batch operations fail, they automatically retry individual items
- Check the detailed error messages for specific failures
- Consider reducing the batch size if you encounter rate limiting
-
Attachment Issues
- File Not Found: Ensure attachment file paths are correct and accessible
- Permission Errors: Check that the server has read access to attachment files
- Size Limits: Gmail has a 25MB attachment size limit per email
- Download Failures: Verify you have write permissions to the download directory
Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
Running evals
The evals package loads an mcp client that then runs the index.ts file, so there is no need to rebuild between tests. You can load environment variables by prefixing the npx command. Full documentation can be found here.
OPENAI_API_KEY=your-key npx mcp-eval src/evals/evals.ts src/index.ts
License
MIT
Support
If you encounter any issues or have questions, please file an issue on the GitHub repository.