Configure the Calendar MCP server

    Google Calendar offers a remote Model Context Protocol (MCP) server that allows AI agents to securely interact with Google Calendar data. By configuring the Google Calendar MCP server, you enable AI applications like Gemini CLI, Claude, or IDEs to perform actions in Google Calendar.

    The Google Calendar MCP server provides a standardized way for AI agents to:

    • Read data: List calendars, retrieve events, and check availability.
    • Take action: Create, update, and delete events.
    • Respect security: Inherit the same permissions and data governance controls as the user.

    Prerequisites

    Configure the Google Calendar MCP server

    To use the Google Calendar MCP server, you must enable it in your Google Cloud project and then configure your MCP client to connect to it.

    Enable the APIs

    To use the Google Calendar MCP server, you must enable the following API in your Google Cloud project:

    • Google Calendar API

    CLI

     gcloud  
services  
 enable 
  
calendar-json.googleapis.com  
--project = 
 PROJECT_ID

    Replace PROJECT_ID with your Google Cloud project ID.

    Console

    Enable the APIs in the Google Cloud console:

    Enable the APIs

    Enable the MCP services

    To enable the MCP components for Google Calendar, you must enable the following service in your Google Cloud project:

    • Google Calendar MCP API

    CLI

     gcloud  
services  
 enable 
  
calendarmcp.googleapis.com  
--project = 
 PROJECT_ID

    Replace PROJECT_ID with your Google Cloud project ID.

    Console

    Enable the MCP services in the Google Cloud console:

    Enable the MCP services

    The Google Calendar MCP server uses OAuth 2.0 for authentication and authorization. You must configure the OAuth consent screen before you can create an OAuth client ID.

    1. In the Google Cloud console, go to Google Auth Platform > Branding.

      Go to Branding

    2. If you have already configured the Google Auth Platform, you can configure the following OAuth Consent Screen settings in Branding , Audience , and Data Access . If you see a message that says Google Auth Platform not configured yet, click Get Started:

      1. Under App Information, in App name, type Calendar MCP Server .
      2. In User support email, select your email address or an appropriate Google group.
      3. Click Next.
      4. Under Audience, select Internal. If you can't select Internal, select External.
      5. Click Next.
      6. Under Contact Information, enter an Email addresswhere you can be notified about any changes to your project.
      7. Click Next.
      8. Under Finish, review the Google API Services User Data Policy and if you agree, select I agree to the Google API Services: User Data Policy.
      9. Click Continue.
      10. Click Create.
      11. If you selected Externalfor user type, add test users:
        1. Click Audience.
        2. Under Test users, click Add users.
        3. Enter your email address and any other authorized test users, then click Save.

    3. Click Data Access > Add or Remove Scopes. A panel appears with a list of scopes for each API that you've enabled in your Google Cloud project.

      1. Under Manually add scopes, paste the scopes for the Google Calendar MCP server:

        • https://www.googleapis.com/auth/calendar.calendarlist.readonly
        • https://www.googleapis.com/auth/calendar.events.freebusy
        • https://www.googleapis.com/auth/calendar.events.readonly

      2. Click Add to Table.

      3. Click Update.

      4. After selecting the scopes required by your app, on the Data Accesspage, click Save.

    Configure your MCP client

    To add the Google Calendar remote MCP server to your MCP client, follow the instructions for your client.

    Gemini CLI

    To add the Google Calendar remote MCP server to your Gemini CLI, add the server configuration to your settings.json file.

    1. Create an OAuth 2.0 client ID and secret:

      1. In the Google Cloud console, go to Google Auth Platform > Clients > Create Client

        Go to Create Client

      2. Select Desktop appas the application type.

      3. Enter a Name.

      4. Click Createand copy your Client IDand Client Secret.

    2. Open or create the configuration file ~/.gemini/settings.json .

    3. Add the mcpServers configuration to settings.json :

        { 
  
 "mcpServers" 
 : 
  
 { 
  
 "calendar" 
 : 
  
 { 
  
 "httpUrl" 
 : 
  
 "https://calendarmcp.googleapis.com/mcp/v1" 
 , 
  
 "oauth" 
 : 
  
 { 
  
 "enabled" 
 : 
  
 true 
 , 
  
 "clientId" 
 : 
  
 " OAUTH_CLIENT_ID 
" 
 , 
  
 "clientSecret" 
 : 
  
 " OAUTH_CLIENT_SECRET 
" 
 , 
  
 "scopes" 
 : 
  
 [ 
  
 "https://www.googleapis.com/auth/calendar.calendarlist.readonly" 
 , 
  
 "https://www.googleapis.com/auth/calendar.events.freebusy" 
 , 
  
 "https://www.googleapis.com/auth/calendar.events.readonly" 
  
 ] 
  
 } 
  
 } 
  
 } 
 }

      Replace the following:

      • OAUTH_CLIENT_ID : The client ID you created.
      • OAUTH_CLIENT_SECRET : The client secret you created.

    4. Save settings.json .

    5. Start Gemini CLI:

       gemini

    6. In Gemini CLI, authenticate with the MCP server by running the following command:

       /mcp  
auth  
calendar
      1. When prompted, press 1 to open an authentication page in your browser. If you're working over SSH, follow the instructions in the CLI.
      2. Sign in to your Google Account.
      3. Review the requested OAuth scopes and click Allow.
      4. A message appears confirming authentication was successful.

    7. In Gemini CLI, run /mcp list to view your configured MCP servers and their tools.

      The response is similar to the following:

       🟢 calendar - Ready (8 tools)
  Tools:
  - create_event
  - delete_event
  - get_event
  - list_calendars
  - list_events
  - respond_to_event
  - suggest_time
  - update_event

    The remote MCP server is ready to use in Gemini CLI.

    Claude

    To use the Google Calendar remote MCP server with Claude.ai or Claude Desktop, you must have the Claude Enterprise, Pro, Max, or Team plan.

    To add the Google Calendar remote MCP server to Claude, configure a custom connector with an OAuth client ID and secret.

    1. Create an OAuth 2.0 client ID and secret:

      1. In the Google Cloud console, go to Google Auth Platform > Clients > Create Client

        Go to Create Client

      2. Select Web applicationas the application type.

      3. Enter a Name.

      4. In the Authorized redirect URIssection, click + Add URI, and then add https://claude.ai/api/mcp/auth_callback in the URIsfield.

      5. Click Createand copy your Client IDand Client Secret.

    2. Configure the MCP server in Claude:

      1. In Claude.ai or Claude Desktop, go to Settings(or Admin settings) > Connectors.
      2. Click Add custom connector.
      3. Enter the connection details for the Google Calendar product:
        • Server name: Google Calendar .
        • Remote MCP server URL: https://calendarmcp.googleapis.com/mcp/v1
      4. In Advanced settings, enter your OAuth client IDand OAuth client secret.
      5. Click Add.

    Others

    Many AI applications have ways to connect to a remote MCP server. You typically need to enter details about the server, like its name, endpoints, transport protocol, and authentication method. For the Google Calendar remote MCP server, enter the following:

    • Server name: calendar

    • Server URL: https://calendarmcp.googleapis.com/mcp/v1

    • Transport: HTTP

    • Authentication: The Google Calendar remote MCP server uses OAuth 2.0. For details, see Learn about authentication and authorization .

    For more details on connecting different types of clients, see Configure MCP in an AI application .

    Test the Google Calendar MCP server

    After you configure the MCP client, you can verify the connection by running some test prompts.

    Try asking your MCP client the following questions:

    • "When is my next meeting with Ariel?"

      The client checks your schedule using calendar.list_events and details your next meeting with Ariel.

    If the tools execute successfully and you receive relevant responses, your Google Calendar MCP server is correctly configured.

    Troubleshooting

    If you encounter issues connecting to the MCP server, you can check for errors in the OAuth logs. Ask your administrator to check the OAuth log eventsin the security investigation tool .

    Tool reference

    The following tools are available for the Google Calendar MCP server:

    • create_event
    • delete_event
    • get_event
    • list_calendars
    • list_events
    • respond_to_event
    • suggest_time
    • update_event

    Important security consideration: Indirect prompt injection

    When you expose a language model to untrusted data, there is a risk of an indirect prompt injection attack . Because MCP clients like Gemini CLI have access to powerful tools and APIs through the Google Calendar MCP server, they can read, modify, and delete data in your Google Account.

    To mitigate these risks, follow these best practices:

    • Only use trusted tools.Never connect Google Calendar MCP server to untrusted or unverified applications.
    • Be cautious with untrusted inputs.Avoid asking your MCP client to process events or other resources from unverified sources. These inputs may contain hidden instructions that can hijack your session, allowing an attacker to modify, steal, or delete your data.
    • Review all actions.Always carefully review the actions taken by your AI client on your behalf to ensure they are correct and align with your intentions.
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