How to integrate Calendly MCP with Atomic Agent

Connect Atomic Agent to Calendly MCP. Find next available time for client, create scheduling link for 30-minute meeting, and more using natural language, with authentication handled for you.

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Calendly MCP

Dcr Oauth

Calendly is an appointment scheduling platform that manages event types, availability, and invites. Use it to automate booking, reduce back-and-forth, and surface open times quickly.

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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 Calendly.

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 Calendly account. See the Atomic Agent documentation for installation instructions.

Also integrate Calendly MCP with

ChatGPT Claude Cowork Hermes

How Atomic Agent connects to Calendly

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 Calendly to Atomic Agent

Sign up or sign in to the Composio dashboard. Copy your API key.
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.
Ask Atomic Agent to do something in Calendly. It searches Composio for the right tool.
On first use, open the sign-in link returned in the chat. Connect your Calendly 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 Calendly MCP server, and what's possible with it?

The Calendly MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Calendly account. It provides structured and secure access to your event types, availability, meetings, scheduling links, and organization, so your agent can find open times, book meetings, create scheduling links, manage events, and coordinate your team on your behalf.

Availability and open times: Have your agent review availability schedules and busy periods, then find bookable times for a specific event type.
Event type management: Let the agent list, create, review, and update event types, including their availability rules.
Meeting booking and management: Direct your agent to book an invitee into an open slot, review scheduled meetings and attendees, cancel an event, or manage no-show records.
Scheduling and share links: Instruct your agent to create single-use scheduling links or customized one-on-one share links with changes to duration, location, availability, or scheduling windows.
Organization and routing coordination: Have your agent manage organization invitations, review members, inspect routing forms and submissions, and check supported meeting locations.

Use Calendly from Atomic Agent

With your account connected, ask Atomic Agent to work with Calendly 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 Calendly MCP action and event your agent gets out of the box.

Availability-get user availability schedule

Use: Fetch details for one named availability schedule.

Availability-list user availability schedules

Use: List all named availability schedules for the connected user.

Availability-list user busy times

Use: List a user's busy time blocks within a date range.

Event types-create event type

Use: Create a new event type on the connected account.

Event types-get event type

Use: Fetch full details for one event type by URI.

Event types-list event type availability schedule

Use: Read the current availability schedule (rules) for an event type.

Event types-list event type available times

Use: List bookable time slots for an event type within a date range.

Event types-list event types

Use: List all event types for the connected user or org.

Event types-update event type

Use: Update fields on an existing event type.

Event types-update event type availability schedule

Use: Overwrite the availability schedule for an event type.

List calendly skills

List or search available Calendly skill guides.

Load calendly skill

Load a Calendly skill guide that provides domain-specific context, recommended queries, and best practices for working with Calendly tools.

Locations-list user meeting locations

Use: List allowed meeting location kinds for a user.

Meetings-cancel event

Use: Cancel a scheduled meeting on behalf of the connected host When: User confirms they want to cancel a specific meeting.

Meetings-create invitee

Use: Book a meeting slot for an invitee on a Calendly event type.

Meetings-create invitee no show

Use: Mark an invitee as a no-show for a past meeting.

Meetings-delete invitee no show

Use: Remove a no-show mark from an invitee.

Meetings-get event

Use: Fetch details for a single scheduled meeting.

Meetings-get event invitee

Use: Fetch details for a single meeting invitee.

Meetings-get invitee no show

Use: Fetch the no-show record for a meeting invitee.

Meetings-list event invitees

Use: List all invitees for a scheduled meeting.

Meetings-list events

Use: List scheduled meetings for user/org.

Organizations-create organization invitation

Use: Invite a user to the organization by email.

Organizations-get organization

Use: Fetch details for the connected user's organization.

Organizations-get organization membership

Use: Fetch details for a single org membership.

Organizations-list organization invitations

Use: List pending invitations for the organization.

Organizations-list organization memberships

Use: List all members of an organization.

Organizations-revoke organization invitation

Use: Revoke a pending organization invitation.

Routing forms-get routing form

Use: Fetch details for a single routing form.

Routing forms-get routing form submission

Use: Fetch details for a single routing form submission.

Routing forms-list routing forms

Use: List routing forms for the org.

Routing forms-list routing form submissions

Use: List submissions for a routing form.

Scheduling links-create single use scheduling link

Use: Create a single-use scheduling link using the event type's settings unchanged.

Shares-create share

Use: Create a single-use share link for a one-on-one event type with per-link overrides When: User wants a single-use link with any customization (duration, scheduling window, location, or availability).

Users-get current user

Use: Resolve the connected host account and canonical user URI.

Users-get user

Use: Fetch profile for a specific user by URI.

FRAMEWORKS

How to build Calendly MCP Agent with another framework

ChatGPT

Use Calendly MCP with ChatGPT

Claude Cowork

Use Calendly MCP with Claude Cowork

Hermes

Use Calendly MCP with Hermes

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FAQ

Frequently asked questions

With a standalone Calendly MCP server, the agents and LLMs can only access a fixed set of Calendly tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Calendly 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 Calendly tools.

Yes, absolutely. You can configure which Calendly 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 Calendly data and credentials are handled as safely as possible.

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