Google Calendar CLI for AI Agents

CLIs are eating MCPs. The industry is converging on the very same idea. MCPs for all their merit can be token hungry, slow, and unreliable for complex tool chaining. However, coding agents have become incredibly good at working with CLIs, and in fact they are far more comfortable working with CLI tools than MCP. With Composio's Universal CLI, your coding agents can talk to over 1000+ SaaS applications. With Google Calendar, agents can create a meeting with the marketing team, list all events scheduled for next week, delete tomorrow’s canceled event from your calendar, and more — all without worrying about authentication. This guide walks you through Composio Universal CLI and explains how you can connect it with coding agents like Claude Code, Codex, OpenCode, etc, for end-to-end Google Calendar automation.

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Google Calendar logoGoogle Calendar
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Google Calendar is a time management service for scheduling meetings, events, and reminders. It streamlines personal and team organization with integrated notifications and sharing options.

44 Tools7 Triggers

Introduction

CLIs are eating MCPs. The industry is converging on the very same idea. MCPs for all their merit can be token hungry, slow, and unreliable for complex tool chaining. However, coding agents have become incredibly good at working with CLIs, and in fact they are far more comfortable working with CLI tools than MCP.

With Composio's Universal CLI, your coding agents can talk to over 1000+ SaaS applications. With Google Calendar, agents can create a meeting with the marketing team, list all events scheduled for next week, delete tomorrow’s canceled event from your calendar, and more — all without worrying about authentication.

This guide walks you through Composio Universal CLI and explains how you can connect it with coding agents like Claude Code, Codex, OpenCode, etc, for end-to-end Google Calendar automation.

Also integrate Google Calendar with

ChatGPTOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenCodeCursorVS CodeOpenClawHermesGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAI

What is Universal CLI and why use it?

The idea behind building the universal CLI is to give agents a single command interface to interact with all your external applications. Here's what you'll get with it:

  • Agent-friendly: Coding agents like Claude Code, Codex, and OpenCode can use CLI tools natively — no MCP setup required.
  • Authentication handled: Connect once via OAuth or API Key, and all CLI commands work with your credentials automatically.
  • Tool discovery: Search, inspect, and execute 20,000+ tools across 1000+ apps from one interface.
  • Trigger support: Use triggers to listen for events across your apps, powered by real-time webhooks or polling under the hood.
  • Type generation: Generate typed schemas for autocomplete and type safety in your projects.

Prerequisites

Install the Composio CLI, authenticate, and initialize your project:

bash
# Install the Composio CLI
curl -fsSL https://composio.dev/install | bash

# Authenticate with Composio
composio login

During login you'll be redirected to sign in page, finish the complete flow and you're all set.

Composio CLI authentication flow

Connecting Google Calendar to Coding Agents via Universal CLI

Once it is installed, it's essentially done. Claude Code, Codex, OpenCode, OpenClaw, or any other agent will be able to access the CLI. A few steps to give agents access to your apps.

  1. Launch your Coding Agent — Claude Code, Codex, OpenCode, anything you prefer.
  2. Prompt it to "Authenticate with Google Calendar"
  3. Complete the authentication and authorization flow and your Google Calendar integration is all set.
  4. Start asking anything you want.

Universal CLI Commands for Google Calendar

You can also manually execute CLI commands to interact with your Google Calendar.

Connect your Google Calendar account

Link your Google Calendar account and verify the connection:

bash
# Connect your Google Calendar account (opens OAuth flow)
composio connected-accounts link googlecalendar

# Verify the connection
composio connected-accounts list --toolkits googlecalendar

Discover Google Calendar tools

Search and inspect available Google Calendar tools:

bash
# List all available Google Calendar tools
composio tools list --toolkit googlecalendar

# Search for Google Calendar tools by action
composio tools search "google calendar"

# Inspect a tool's input schema
composio tools info GOOGLECALENDAR_CALENDAR_LIST_INSERT

Common Google Calendar Actions

Insert Calendar into List — Inserts an existing calendar into the user's calendar list

bash
composio tools execute GOOGLECALENDAR_CALENDAR_LIST_INSERT \
  --id "examplecalendar@group.calendar.google.com"

Update Calendar List Entry — Updates an existing entry on the user\'s calendar list

bash
composio tools execute GOOGLECALENDAR_CALENDAR_LIST_UPDATE \
  --calendar_id "primary"

Delete Calendar — Deletes a secondary calendar

bash
composio tools execute GOOGLECALENDAR_CALENDARS_DELETE \
  --calendar_id "primary"

Update Calendar — Updates metadata for a calendar

bash
composio tools execute GOOGLECALENDAR_CALENDARS_UPDATE \
  --summary "<string>" \
  --calendarId "<string>"

Set up Google Calendar Triggers

Listen for events in real time using triggers:

Attendee Response Changed — Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative

bash
# Find your connected account ID
composio connected-accounts list --toolkits googlecalendar

# Create a trigger
composio triggers create GOOGLECALENDAR_ATTENDEE_RESPONSE_CHANGED_TRIGGER \
  --connected-account-id <your-connected-account-id> \
  --trigger-config '{
  "interval": 2,
  "calendarId": "primary",
  "showDeleted": true
}'

# Listen for trigger events in real time
composio triggers listen --toolkits googlecalendar --table

Event Canceled or Deleted — Triggers when a Google Calendar event is cancelled or deleted

bash
# Find your connected account ID
composio connected-accounts list --toolkits googlecalendar

# Create a trigger
composio triggers create GOOGLECALENDAR_EVENT_CANCELED_DELETED_TRIGGER \
  --connected-account-id <your-connected-account-id> \
  --trigger-config '{
  "interval": 2,
  "calendarId": "primary"
}'

# Listen for trigger events in real time
composio triggers listen --toolkits googlecalendar --table

Event Starting Soon — Triggers when a calendar event is within a configured number of minutes from starting

bash
# Find your connected account ID
composio connected-accounts list --toolkits googlecalendar

# Create a trigger
composio triggers create GOOGLECALENDAR_EVENT_STARTING_SOON_TRIGGER \
  --connected-account-id <your-connected-account-id> \
  --trigger-config '{
  "calendarId": "primary",
  "include_all_day": "<boolean>",
  "countdown_window_minutes": 30
}'

# Listen for trigger events in real time
composio triggers listen --toolkits googlecalendar --table

Generate Type Definitions

Generate typed schemas for Google Calendar tools to get autocomplete and type safety in your project:

bash
# Auto-detect language
composio generate --toolkits googlecalendar

# TypeScript
composio ts generate --toolkits googlecalendar

# Python
composio py generate --toolkits googlecalendar

Tips & Tricks

  • Always inspect a tool's input schema before executing: composio tools info <TOOL_NAME>
  • Pipe output with jq for better readability: composio tools execute TOOL_NAME -d '{}' | jq
  • Set COMPOSIO_API_KEY as an environment variable for CI/CD pipelines
  • Use composio dev logs tools to inspect execution logs and debug issues

Next Steps

  • Try asking your coding agent to perform various Google Calendar operations
  • Explore cross-app workflows by connecting more toolkits
  • Set up triggers for real-time automation
  • Use composio generate for typed schemas in your projects
TOOLS & TRIGGERS

Supported Tools and Triggers

Every Google Calendar action and event your agent gets out of the box.

Delete ACL Rule

Deletes an access control rule from a Google Calendar.

Get ACL Rule

Retrieves a specific access control rule for a calendar.

Create ACL Rule

Creates an access control rule for a calendar.

List ACL Rules

Retrieves the list of access control rules (ACLs) for a specified calendar, providing the necessary 'rule_id' values required for updating specific ACL rules.

Patch ACL Rule

Updates an existing access control rule for a calendar using patch semantics (partial update).

Update ACL Rule

Updates an access control rule for the specified calendar.

Watch ACL Changes

Tool to watch for changes to ACL resources.

Batch Events

Execute up to 1000 event mutations (create/patch/delete) in one Google Calendar HTTP batch request with per-item status/results.

Remove Calendar from List

Tool to remove a calendar from the user's calendar list.

Get Single Calendar by ID

Retrieves metadata for a SINGLE specific calendar from the user's calendar list by its calendar ID.

Insert Calendar into List

Inserts an existing calendar into the user's calendar list, making it visible in the UI.

Patch Calendar List Entry

Updates an existing calendar on the user's calendar list using patch semantics.

Update Calendar List Entry

Updates a calendar list entry's display/subscription settings (color, visibility, reminders, selection) for the authenticated user — does not modify the underlying calendar resource (title, timezone, etc.

Watch Calendar List

Watch for changes to CalendarList resources using push notifications.

Delete Calendar

Deletes a secondary calendar that you own or have delete permissions on.

Update Calendar

Full PUT-style update that overwrites all calendar metadata fields; unspecified optional fields are cleared.

Stop Channel

Tool to stop watching resources through a notification channel.

Clear Calendar

Clears a primary calendar by deleting all events from it.

Get Color Definitions

Returns the color definitions for calendars and events.

Create Event

Create a Google Calendar event using start_datetime plus duration fields.

Delete event

Deletes a specified event by `event_id` from a Google Calendar (`calendar_id`); idempotent — a 404 for an already-deleted event is a no-op.

Create a calendar

Creates a new, empty Google Calendar with the specified title (summary).

Get Event

Retrieves a SINGLE event by its unique event_id (REQUIRED).

Import Event

Tool to import an event as a private copy to a calendar.

Get Event Instances

Returns instances of the specified recurring event.

List Events

Returns events on the specified calendar.

List Events from All Calendars

Return a unified event list across all calendars in the user's calendar list for a given time range.

Move Event

Moves an event to another calendar, i.

Watch Events

Watch for changes to Events resources.

Find event

Finds events in a specified Google Calendar using text query, time ranges (event start/end, last modification), and event types.

Find free slots

Finds both free and busy time slots in Google Calendars for specified calendars within a defined time range.

Get Google Calendar

Retrieves a specific Google Calendar, identified by `calendar_id`, to which the authenticated user has access.

Get current date and time

Gets the current date and time, allowing for a specific timezone offset.

List Buildings

Lists all buildings for a Google Workspace customer account with full details including addresses, coordinates, and floor names.

List Calendar Resources

Retrieves calendar resources (such as conference rooms) from a Google Workspace domain using the Admin SDK Directory API.

List Google Calendars

Retrieves calendars from the user's Google Calendar list, with options for pagination and filtering.

Patch Calendar

Partially updates (PATCHes) an existing Google Calendar, modifying only the fields provided.

Patch Event

Update specified fields of an existing event in a Google Calendar using patch semantics (array fields like `attendees` are fully replaced if provided); ensure the `calendar_id` and `event_id` are valid and the user has write access to the calendar.

Quick Add Event

Parses natural language text to quickly create a basic Google Calendar event with its title, date, and time, suitable for simple scheduling; does not support direct attendee addition or recurring events, and `calendar_id` must be valid if not 'primary'.

Remove attendee from event

Removes an attendee from a specified event in a Google Calendar; the calendar and event must exist.

Get Calendar Setting

Tool to return a single user setting for the authenticated user.

List Settings

Returns all user settings for the authenticated user.

Watch Settings

Watch for changes to Settings resources.

Update Google event

Updates an existing event in Google Calendar.

FRAMEWORKS

How to build Google Calendar MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Google Calendar MCP with ChatGPT

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Google Calendar MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Google Calendar MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Google Calendar MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Google Calendar MCP with Claude Cowork

Codex logo

Codex

Use Google Calendar MCP with Codex

Cursor logo

Cursor

Use Google Calendar MCP with Cursor

OpenClaw logo

OpenClaw

Use Google Calendar MCP with OpenClaw

Hermes logo

Hermes

Use Google Calendar MCP with Hermes

Google ADK logo

Google ADK

Use Google Calendar MCP with Google ADK

LangChain logo

LangChain

Use Google Calendar MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Google Calendar MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Google Calendar MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Google Calendar MCP with LlamaIndex

CrewAI logo

CrewAI

Use Google Calendar MCP with CrewAI

OpenCode logo

OpenCode

Use Google Calendar MCP with OpenCode

VS Code logo

VS Code

Use Google Calendar MCP with VS Code

FAQ

Frequently asked questions

The Composio Universal CLI is a single command-line interface that lets coding agents and developers interact with 1000+ SaaS applications. It handles authentication, tool discovery, action execution, and trigger setup — all from the terminal, without needing to configure MCP servers.

Any coding agent that can run shell commands works with the Composio CLI — including Claude Code, Codex, OpenCode, OpenClaw, and others. Once the CLI is installed, agents automatically discover and use the composio commands to interact with Google Calendar and other connected apps.

MCP servers require configuration and can be token-heavy for complex workflows. The CLI gives agents a direct, lightweight interface — no server setup needed. Agents simply call composio commands like any other shell tool. It's faster to set up, more reliable for multi-step tool chaining, and works natively with how coding agents already operate.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Google Calendar data and credentials are handled as safely as possible. You can also bring your own OAuth credentials for full control.

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