Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Calendarhero MCP integration, Codex can create meeting requests, manage contacts, list meeting types and calendars, send reminders, and message the scheduling assistant, all without leaving the terminal or the app, whichever you prefer.
- UseBuildFeaturesTRIGGERSStart background agents from events across your connected appsFIREWALLNEWBlocks instructions hidden in tool results before your agent reads themINSTANTNEWAudio, video, search, browser and data tools, with no keys to manageOPTIMIZATIONLower cost per completed task with optimised tools and skills
- DOCS
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How to integrate Calendarhero MCP with Codex
Connect Codex to Calendarhero MCP. Schedule a meeting with your project team, list all meetings i have this week, and more using natural language, with authentication handled for you.
Api Key
Calendarhero is a powerful scheduling platform that streamlines your calendar management across multiple services. It helps you efficiently schedule, reschedule, and organize meetings without the back-and-forth.
38 Tools
Introduction
Also integrate Calendarhero with
Why use Composio?
Apart from a managed and hosted MCP server, you will get:
- CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Large tool responses: Handle them to minimise context rot.
- Dynamic just-in-time access to 20,000 tools across 1700+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.
How to install Calendarhero MCP in Codex
Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.
(Optional) Authenticate with OAuth
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
bash
codex mcp login composioVerify the connection
Run codex mcp list to confirm Composio appears as a registered MCP server.
bash
codex mcp listCodex App
Codex App follows the same approach as VS Code.
- Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
- Fill the header and Key fields with
{ "x-consumer-api-key" = "ck_*******" }. - The Key is the Composio API key, that you can find on dashboard.composio.dev
- Click on Authenticate and authorize Codex to your Composio account and you're all set.
- Restart and verify if it's there in
.codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }Try it
Ask Codex for a Calendarhero task. The first time, Composio asks you to connect your Calendarhero account.
For example, ask it to:
- "Schedule a meeting with your project team"
- "List all meetings I have this week"
- "Fetch details for your next scheduled meeting"
What is the Calendarhero MCP server, and what's possible with it?
The Calendarhero MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Calendarhero account. It provides structured and secure access to your calendar management tools, so your agent can schedule meetings, manage contacts, fetch meeting details, and access your calendar integrations on your behalf.
- Automated meeting scheduling and requests: Easily have your agent schedule new meetings, select participants, set time ranges, and include extra meeting details in just a few steps.
- Contact creation and management: Let the agent create new contacts or fetch existing ones, so scheduling is always quick and accurate.
- Meeting details retrieval: Ask your agent to fetch specific meeting details or get a list of all meetings within a defined timeframe, keeping you up-to-date.
- Access and manage calendar integrations: Direct your agent to list all connected calendars, add new integrations, or access available calendars for streamlined scheduling.
- Template and meeting type discovery: Quickly retrieve available meeting templates and types, letting your agent optimize scheduling based on your preferences and routines.
Conclusion
You've successfully integrated Calendarhero with Codex using Composio's MCP server. Now you can interact with Calendarhero directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
- Seamless integration across CLI, VS Code, and standalone app
- Natural language commands for Calendarhero operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1700+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Calendarhero operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Calendarhero action and event your agent gets out of the box.
FRAMEWORKS
How to build Calendarhero MCP Agent with another framework
Claude Code
Use Calendarhero MCP with Claude Code
Claude Cowork
Use Calendarhero MCP with Claude Cowork
OpenAI Agents SDK
Use Calendarhero MCP with OpenAI Agents SDK
Claude Agent SDK
Use Calendarhero MCP with Claude Agent SDK
OpenClaw
Use Calendarhero MCP with OpenClaw
Hermes
Use Calendarhero MCP with Hermes
Atomic Agent
Use Calendarhero MCP with Atomic Agent
Google ADK
Use Calendarhero MCP with Google ADK
LangChain
Use Calendarhero MCP with LangChain
Vercel AI SDK
Use Calendarhero MCP with Vercel AI SDK
Mastra AI
Use Calendarhero MCP with Mastra AI
LlamaIndex
Use Calendarhero MCP with LlamaIndex
CrewAI
Use Calendarhero MCP with CrewAI
Pydantic AI
Use Calendarhero MCP with Pydantic AI
AutoGen
Use Calendarhero MCP with AutoGen
MORE TOOLKITS
Explore Other Toolkits
Google Calendar
Oauth2
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.
Apaleo
Oauth2
Apaleo is a cloud-based property management platform for hospitality businesses. It centralizes reservations, billing, and daily operations for smoother hotel management.
Appointo
Api Key
Appointo is an appointment booking platform for Shopify stores. It lets businesses add online scheduling to their websites with zero coding.
Bart
Api Key
Bart is the Bay Area Rapid Transit system, providing fast public transportation across the San Francisco Bay Area. It helps commuters and travelers get real-time schedule info, plan routes, and stay updated on service changes.
FAQ
Frequently asked questions
With a standalone Calendarhero MCP server, the agents and LLMs can only access a fixed set of Calendarhero tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Calendarhero and many other apps based on the task at hand, all through a single MCP endpoint.
Yes, you can. Codex 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 Calendarhero tools.
Yes, absolutely. You can configure which Calendarhero 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 Calendarhero data and credentials are handled as safely as possible.
Start with Calendarhero.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Calendarhero tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building