How to integrate Zoho Calendar MCP with Atomic Agent

Connect Atomic Agent to Zoho Calendar MCP. Create a recurring zoho calendar team meeting, check availability before scheduling a client call, and more using natural language, with authentication handled for you.

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Zoho Calendar is a scheduling service for managing calendars, events, availability, and resource bookings. It helps teams coordinate meetings and shared resources across Zoho data centers.

57 Tools

Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Zoho Calendar.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Zoho Calendar account. See the Atomic Agent documentation for installation instructions.

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How Atomic Agent connects to Zoho Calendar

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect Zoho Calendar to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in Zoho Calendar. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your Zoho Calendar account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

What is the Zoho Calendar MCP server, and what's possible with it?

The Zoho Calendar MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Zoho Calendar account. It provides structured and secure access to your calendars, events, availability, settings, and resource bookings, so your agent can schedule events, find free time, manage calendars, and book rooms on your behalf.

  • Event and calendar management: Have your agent create timed, all-day, or recurring events, retrieve event details, list events for a date range, and delete events or selected recurrences.
  • Calendar organization: Let the agent create, view, list, and delete personal calendars, check calendar settings, and review sharing entries for a calendar.
  • Availability planning: Direct your agent to check a user's free and busy times, inspect room availability, and list recurring event instances within a date range.
  • Room booking: Instruct your agent to find available rooms, create bookings with attendees and recurrence options, view or delete bookings, and list your upcoming room reservations.
  • Resource administration: Have your agent manage resource booking branches, rooms, features, favorite resources, and organization or user booking settings.

Use Zoho Calendar from Atomic Agent

With your account connected, ask Atomic Agent to work with Zoho Calendar in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

TOOLS

Supported Tools

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

Check Resource Booking Access

Check whether Resource Booking is enabled for the connected Zoho account.

Create Resource Booking

Book one or more available rooms in paid Zoho Resource Booking, optionally with attendees, groups, notifications, or a daily, weekly, or monthly recurrence.

Create Resource Booking Branch

Create a branch with buildings and floors in paid Zoho Resource Booking.

Create Calendar

Create a personal calendar with a required name and color.

Create Event

Create a timed, all-day, or recurring Zoho Calendar event without creating Zoho Meeting conferencing.

Create Resource Booking Room

Create a room in paid Zoho Resource Booking.

Create Resource Booking Organization Settings

Initialize organization-wide limits in paid Zoho Resource Booking.

Create Resource Booking User Settings

Initialize user preferences in paid Zoho Resource Booking.

Create Resource Feature

Create a feature definition in paid Zoho Resource Booking.

Delete Resource Booking

Permanently delete one room booking, all or future recurrence occurrences, or one selected occurrence.

Delete Resource Booking Branch

Permanently delete a branch from paid Zoho Resource Booking.

Delete Calendar

Permanently delete a calendar and return Zoho's deletion envelope.

Delete Event

Delete an event, all following recurrences, or one recurrence instance using the latest ETag.

Delete Event Attachments

Remove specified attachments from an event using its full date/time data and latest ETag; the event itself remains.

Delete Resource

Permanently delete a room resource from paid Zoho Resource Booking.

Delete Resource Feature

Permanently delete a feature from paid Zoho Resource Booking.

Download Event Attachment

Download one event attachment.

Download Resource Image

Download one resource image by its opaque image ID, exact provider file name, and owning resource ID.

Favorite Resource

Mark one room as a favorite for the connected user.

Get Resource Booking

Return one room booking or a specified recurrence occurrence from paid Zoho Resource Booking.

Get Resource Booking Branch

Return one Resource Booking branch with its buildings and floors.

Get Calendar

Return full details for one calendar UID, including the documented default or primary aliases.

Get Calendar Settings

Return the connected user's Calendar preferences.

Get Event

Return full details for one event or a specified recurrence instance.

Get Resource Booking Resource

Return one room from paid Zoho Resource Booking.

Get Resource Booking Organization Settings

Return organization-wide policy settings from paid Zoho Resource Booking.

Get Resource Booking User Settings

Return user preferences from paid Zoho Resource Booking.

Get Resource Feature

Return one feature definition from paid Zoho Resource Booking.

Get Resource Free Busy

Return strict date-keyed busy intervals for one room resource over an exact inclusive date range.

Get User Free Busy

Return event-based or time-based free/busy data for one email and exact local-naive time range.

List Resource Bookings

Return bookings for selected rooms in a paid Zoho Resource Booking branch.

List Resource Booking Branches

Return all branches from paid Zoho Resource Booking, including their buildings and floors.

List Calendars

Return calendars visible to the connected user, optionally by documented category and hidden status.

List Calendar Shares

Return user and group sharing entries for one calendar.

List Event Instances

Return recurrence instances for one repeating event in a required range of at most 90 days.

List Events

Return events in one calendar for a required range of at most 31 days.

List Favorite Resources

Return the connected user's favorite room resources from paid Zoho Resource Booking.

Get Group Attendee Statuses

Return member RSVP statuses for one group attendee on an event.

List My Resource Bookings

Return the connected user's room bookings for an exact date range.

List Resource Availability

Return room resources and availability for a branch, optional building or floor, and an exact date/time range.

List Resource Booking User Settings

List user settings for at least one branch, building, or floor in paid Zoho Resource Booking.

List Resource Features

Return all feature definitions from paid Zoho Resource Booking.

List Resources

Return room resources for at least one branch, building, or floor.

Move Event

Move an event between personal or group calendars, optionally changing documented event details; shared and app calendars are unsupported and recurrence changes affect all occurrences.

Replace Event

Replace an event using complete date/time data and its latest ETag, without adding Zoho Meeting conferencing.

Unfavorite Resource

Remove one room from the connected user's favorites.

Update Resource Booking

Update a room booking or selected recurrence occurrences in paid Zoho Resource Booking.

Update Resource Booking Branch

Update a branch or add or remove its buildings and floors in paid Zoho Resource Booking.

Update Calendar

Update one or more documented properties of an existing calendar.

Update Calendar Settings

Update a non-empty set of the connected user's documented Calendar preferences.

Update Calendar Share

Supports add, edit, and revoke modes for one user or group calendar share; operation='delete' revokes access, so every call is pessimistically gated as destructive.

Update Event

Partially update event fields or attendee data using exactly one documented payload.

Update Resource

Update a room, its feature assignments, or its visibility in paid Zoho Resource Booking.

Update Resource Booking Organization Settings

Update organization-wide booking limits in paid Zoho Resource Booking.

Update Resource Booking User Settings

Update user preferences in paid Zoho Resource Booking.

Update Resource Feature

Rename or hide a feature in paid Zoho Resource Booking.

Upload Event Attachment

Upload one file of at most 10,240 kB.

FAQ

Frequently asked questions

With a standalone Zoho Calendar MCP server, the agents and LLMs can only access a fixed set of Zoho Calendar tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Zoho Calendar and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Zoho Calendar tools.

Yes, absolutely. You can configure which Zoho Calendar scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

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 Zoho Calendar data and credentials are handled as safely as possible.

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