# How to integrate Scheduleonce MCP with Pydantic AI ```json { "title": "How to integrate Scheduleonce MCP with Pydantic AI", "toolkit": "Scheduleonce", "toolkit_slug": "scheduleonce", "framework": "Pydantic AI", "framework_slug": "pydantic-ai", "url": "https://composio.dev/toolkits/scheduleonce/framework/pydantic-ai", "markdown_url": "https://composio.dev/toolkits/scheduleonce/framework/pydantic-ai.md", "updated_at": "2026-03-29T06:48:52.795Z" } ``` ## Introduction This guide walks you through connecting Scheduleonce to Pydantic AI using the Composio tool router. By the end, you'll have a working Scheduleonce agent that can book a meeting with john doe, list all upcoming bookings this week, cancel tomorrow's meeting with client through natural language commands. This guide will help you understand how to give your Pydantic AI agent real control over a Scheduleonce account through Composio's Scheduleonce MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Scheduleonce with - [OpenAI Agents SDK](https://composio.dev/toolkits/scheduleonce/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/scheduleonce/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/scheduleonce/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/scheduleonce/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/scheduleonce/framework/codex) - [OpenClaw](https://composio.dev/toolkits/scheduleonce/framework/openclaw) - [Hermes](https://composio.dev/toolkits/scheduleonce/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/scheduleonce/framework/cli) - [Google ADK](https://composio.dev/toolkits/scheduleonce/framework/google-adk) - [LangChain](https://composio.dev/toolkits/scheduleonce/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/scheduleonce/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/scheduleonce/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/scheduleonce/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/scheduleonce/framework/crew-ai) ## TL;DR Here's what you'll learn: - How to set up your Composio API key and User ID - How to create a Composio Tool Router session for Scheduleonce - How to attach an MCP Server to a Pydantic AI agent - How to stream responses and maintain chat history - How to build a simple REPL-style chat interface to test your Scheduleonce workflows ## What is Pydantic AI? Pydantic AI is a Python framework for building AI agents with strong typing and validation. It leverages Pydantic's data validation capabilities to create robust, type-safe AI applications. Key features include: - Type Safety: Built on Pydantic for automatic data validation - MCP Support: Native support for Model Context Protocol servers - Streaming: Built-in support for streaming responses - Async First: Designed for async/await patterns ## What is the Scheduleonce MCP server, and what's possible with it? The Scheduleonce MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Scheduleonce account. It provides structured and secure access so your agent can perform Scheduleonce operations on your behalf. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `SCHEDULEONCE_BOOK_TIME_SLOT` | Book Time Slot | Tool to book a time slot on a booking calendar in OnceHub. Use when you need to schedule a meeting by booking one of the available time slots. First retrieve available time slots using 'Get available time slots', then use this tool to book one of those slots with guest information. | | `SCHEDULEONCE_CANCEL_BOOKING` | Cancel Booking | Tool to cancel a booking by ID in OnceHub. Use when you need to cancel an existing booking, optionally providing a cancellation reason and controlling whether to send cancellation email notifications. | | `SCHEDULEONCE_CREATE_CONTACT` | Create Contact | Tool to create a new contact in ScheduleOnce. Use when you need to add a contact with email, first name, and last name. Additional fields like company, phone, and address details can be optionally provided. | | `SCHEDULEONCE_CREATE_ONE_TIME_LINK_FOR_BOOKING_CALENDAR` | Create One-Time Link for Booking Calendar | Tool to create a one-time booking link for a booking calendar in OnceHub. Use when you need to generate a unique, single-use booking link for a customer. One-time links are good for one booking only and automatically expire after one year if not used. The booking calendar must be published to create one-time links. | | `SCHEDULEONCE_CREATE_USER` | Create User | Tool to create a new user account in OnceHub. Use when you need to add a new user with first name, last name, and email. Optional role can be specified. | | `SCHEDULEONCE_DELETE_CONTACT` | Delete Contact | Tool to delete a contact by ID from OnceHub. Use when you need to permanently remove a contact from the system. | | `SCHEDULEONCE_DELETE_USER` | Delete User | Tool to delete a user account from OnceHub. Use when you need to permanently remove a user from the system. | | `SCHEDULEONCE_GET_AVAILABLE_TIME_SLOTS` | Get Available Time Slots | Tool to retrieve available time slots for a booking calendar from OnceHub. Use when you need to check availability for scheduling appointments within a specific date range (maximum 30 days). Returns real-time availability based on booking rules and participant calendars. | | `SCHEDULEONCE_GET_SINGLE_BOOKING` | Get Single Booking | Tool to retrieve a single booking by ID from OnceHub. Use when you need to fetch complete booking details including timing, customer information, location, status, and form submission data. | | `SCHEDULEONCE_GET_SINGLE_BOOKING_CALENDAR` | Get Single Booking Calendar | Tool to retrieve a single booking calendar by ID from OnceHub. Use when you need to fetch detailed information about a specific booking calendar including its subject, name, URL, host, published status, and duration. | | `SCHEDULEONCE_GET_SINGLE_CONTACT` | Get Single Contact | Tool to retrieve a single contact by ID from OnceHub. Use when you need to fetch complete contact details including personal information, location data, and custom fields. | | `SCHEDULEONCE_GET_SINGLE_MASTER_PAGE` | Get Single Master Page | Tool to retrieve a single master page by ID from OnceHub. Use when you need to fetch complete master page details including name, label, URL, and active status. | | `SCHEDULEONCE_GET_SINGLE_USER` | Get Single User | Tool to retrieve a single user by ID from OnceHub. Use when you need to fetch detailed information about a specific user including their name, email, status, role, timezone, and team associations. | | `SCHEDULEONCE_GET_USER_SCHEDULING_AVAILABILITY` | Get User Scheduling Availability | Tool to get user scheduling availability from OnceHub. Use when you need to retrieve a user's weekly schedule, working hours, and any date-specific overrides. | | `SCHEDULEONCE_LIST_ALL_BOOKING_CALENDARS` | List All Booking Calendars | Tool to list all booking calendars in the account. Use when you need to retrieve all booking calendars with optional cursor-based pagination. | | `SCHEDULEONCE_LIST_ALL_BOOKING_PAGES` | List All Booking Pages | Tool to list all booking pages in the account. Use when you need to retrieve all booking pages with optional cursor-based pagination. | | `SCHEDULEONCE_LIST_ALL_BOOKINGS` | List All Bookings | Tool to list all bookings in the account. Use when you need to retrieve bookings with optional filtering by time ranges, pagination, or expansion of related objects. | | `SCHEDULEONCE_LIST_ALL_CONTACTS` | List All Contacts | Tool to list all contacts in the OnceHub account. Use when you need to retrieve contact information with optional filtering by creation time, update time, owner, or cursor-based pagination. | | `SCHEDULEONCE_LIST_ALL_EVENT_TYPES` | List All Event Types | Tool to list all event types in the account. Use when you need to retrieve all event types with optional cursor-based pagination to understand available event type options. | | `SCHEDULEONCE_LIST_ALL_MASTER_PAGES` | List All Master Pages | Tool to list all master pages in the account. Use when you need to retrieve all master pages with optional cursor-based pagination. | | `SCHEDULEONCE_LIST_ALL_TEAMS` | List All Teams | Tool to list all teams in the OnceHub account. Use when you need to retrieve team information with optional cursor-based pagination. | | `SCHEDULEONCE_LIST_ALL_USERS` | List All Users | Tool to list all users in the OnceHub account. Use when you need to retrieve user information with optional cursor-based pagination. | | `SCHEDULEONCE_MARK_BOOKING_AS_NO_SHOW` | Mark Booking as No-Show | Tool to mark a completed booking as no-show in OnceHub. Use when the customer did not attend the scheduled meeting and you need to update the booking status to reflect the no-show. | | `SCHEDULEONCE_TEST_API_KEY` | Test API Key | Tool to validate API key authentication for OnceHub. Use when you need to verify that your API key is valid and active before making other API calls to the platform. | | `SCHEDULEONCE_UPDATE_CONTACT` | Update Contact | Tool to update an existing contact in ScheduleOnce. Use when you need to modify contact information such as name, email, company, or phone number. | | `SCHEDULEONCE_UPDATE_USER` | Update User | Tool to update an existing user in OnceHub. Use when you need to modify user information such as name, email, role, or timezone. | | `SCHEDULEONCE_UPDATE_USER_SCHEDULING_AVAILABILITY` | Update User Scheduling Availability | Tool to update user scheduling availability in OnceHub. Use when you need to modify a user's weekly schedule, set working hours for specific days, or add date-specific overrides for holidays or special events. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Scheduleonce MCP server is an implementation of the Model Context Protocol that connects your AI agent to Scheduleonce. It provides structured and secure access so your agent can perform Scheduleonce operations on your behalf through a secure, permission-based interface. With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster. ## Step-by-step Guide ### 1. Prerequisites Before starting, make sure you have: - Python 3.9 or higher - A Composio account with an active API key - Basic familiarity with Python and async programming ### 1. Getting API Keys for OpenAI and Composio OpenAI API Key - Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) and create an API key. You'll need credits to use the models, or you can connect to another model provider. - Keep the API key safe. Composio API Key - Log in to the [Composio dashboard](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs). - Navigate to your API settings and generate a new API key. - Store this key securely as you'll need it for authentication. ### 2. Install dependencies Install the required libraries. What's happening: - composio connects your agent to external SaaS tools like Scheduleonce - pydantic-ai lets you create structured AI agents with tool support - python-dotenv loads your environment variables securely from a .env file ```bash pip install composio pydantic-ai python-dotenv ``` ### 3. Set up environment variables Create a .env file in your project root. What's happening: - COMPOSIO_API_KEY authenticates your agent to Composio's API - USER_ID associates your session with your account for secure tool access - OPENAI_API_KEY to access OpenAI LLMs ```bash COMPOSIO_API_KEY=your_composio_api_key_here USER_ID=your_user_id_here OPENAI_API_KEY=your_openai_api_key ``` ### 4. Import dependencies What's happening: - We load environment variables and import required modules - Composio manages connections to Scheduleonce - MCPServerStreamableHTTP connects to the Scheduleonce MCP server endpoint - Agent from Pydantic AI lets you define and run the AI assistant ```python import asyncio import os from dotenv import load_dotenv from composio import Composio from pydantic_ai import Agent from pydantic_ai.mcp import MCPServerStreamableHTTP load_dotenv() ``` ### 5. Create a Tool Router Session What's happening: - We're creating a Tool Router session that gives your agent access to Scheduleonce tools - The create method takes the user ID and specifies which toolkits should be available - The returned session.mcp.url is the MCP server URL that your agent will use ```python async def main(): api_key = os.getenv("COMPOSIO_API_KEY") user_id = os.getenv("USER_ID") if not api_key or not user_id: raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment") # Create a Composio Tool Router session for Scheduleonce composio = Composio(api_key=api_key) session = composio.create( user_id=user_id, toolkits=["scheduleonce"], ) url = session.mcp.url if not url: raise ValueError("Composio session did not return an MCP URL") ``` ### 6. Initialize the Pydantic AI Agent What's happening: - The MCP client connects to the Scheduleonce endpoint - The agent uses GPT-5 to interpret user commands and perform Scheduleonce operations - The instructions field defines the agent's role and behavior ```python # Attach the MCP server to a Pydantic AI Agent scheduleonce_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY}) agent = Agent( "openai:gpt-5", toolsets=[scheduleonce_mcp], instructions=( "You are a Scheduleonce assistant. Use Scheduleonce tools to help users " "with their requests. Ask clarifying questions when needed." ), ) ``` ### 7. Build the chat interface What's happening: - The agent reads input from the terminal and streams its response - Scheduleonce API calls happen automatically under the hood - The model keeps conversation history to maintain context across turns ```python # Simple REPL with message history history = [] print("Chat started! Type 'exit' or 'quit' to end.\n") print("Try asking the agent to help you with Scheduleonce.\n") while True: user_input = input("You: ").strip() if user_input.lower() in {"exit", "quit", "bye"}: print("\nGoodbye!") break if not user_input: continue print("\nAgent is thinking...\n", flush=True) async with agent.run_stream(user_input, message_history=history) as stream_result: collected_text = "" async for chunk in stream_result.stream_output(): text_piece = None if isinstance(chunk, str): text_piece = chunk elif hasattr(chunk, "delta") and isinstance(chunk.delta, str): text_piece = chunk.delta elif hasattr(chunk, "text"): text_piece = chunk.text if text_piece: collected_text += text_piece result = stream_result print(f"Agent: {collected_text}\n") history = result.all_messages() ``` ### 8. Run the application What's happening: - The asyncio loop launches the agent and keeps it running until you exit ```python if __name__ == "__main__": asyncio.run(main()) ``` ## Complete Code ```python import asyncio import os from dotenv import load_dotenv from composio import Composio from pydantic_ai import Agent from pydantic_ai.mcp import MCPServerStreamableHTTP load_dotenv() async def main(): api_key = os.getenv("COMPOSIO_API_KEY") user_id = os.getenv("USER_ID") if not api_key or not user_id: raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment") # Create a Composio Tool Router session for Scheduleonce composio = Composio(api_key=api_key) session = composio.create( user_id=user_id, toolkits=["scheduleonce"], ) url = session.mcp.url if not url: raise ValueError("Composio session did not return an MCP URL") # Attach the MCP server to a Pydantic AI Agent scheduleonce_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY}) agent = Agent( "openai:gpt-5", toolsets=[scheduleonce_mcp], instructions=( "You are a Scheduleonce assistant. Use Scheduleonce tools to help users " "with their requests. Ask clarifying questions when needed." ), ) # Simple REPL with message history history = [] print("Chat started! Type 'exit' or 'quit' to end.\n") print("Try asking the agent to help you with Scheduleonce.\n") while True: user_input = input("You: ").strip() if user_input.lower() in {"exit", "quit", "bye"}: print("\nGoodbye!") break if not user_input: continue print("\nAgent is thinking...\n", flush=True) async with agent.run_stream(user_input, message_history=history) as stream_result: collected_text = "" async for chunk in stream_result.stream_output(): text_piece = None if isinstance(chunk, str): text_piece = chunk elif hasattr(chunk, "delta") and isinstance(chunk.delta, str): text_piece = chunk.delta elif hasattr(chunk, "text"): text_piece = chunk.text if text_piece: collected_text += text_piece result = stream_result print(f"Agent: {collected_text}\n") history = result.all_messages() if __name__ == "__main__": asyncio.run(main()) ``` ## Conclusion You've built a Pydantic AI agent that can interact with Scheduleonce through Composio's Tool Router. With this setup, your agent can perform real Scheduleonce actions through natural language. You can extend this further by: - Adding other toolkits like Gmail, HubSpot, or Salesforce - Building a web-based chat interface around this agent - Using multiple MCP endpoints to enable cross-app workflows (for example, Gmail + Scheduleonce for workflow automation) This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations. ## How to build Scheduleonce MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/scheduleonce/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/scheduleonce/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/scheduleonce/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/scheduleonce/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/scheduleonce/framework/codex) - [OpenClaw](https://composio.dev/toolkits/scheduleonce/framework/openclaw) - [Hermes](https://composio.dev/toolkits/scheduleonce/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/scheduleonce/framework/cli) - [Google ADK](https://composio.dev/toolkits/scheduleonce/framework/google-adk) - [LangChain](https://composio.dev/toolkits/scheduleonce/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/scheduleonce/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/scheduleonce/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/scheduleonce/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/scheduleonce/framework/crew-ai) ## Related Toolkits - [Google Calendar](https://composio.dev/toolkits/googlecalendar) - 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. - [Google Sheets](https://composio.dev/toolkits/googlesheets) - Google Sheets is a cloud-based spreadsheet tool for real-time collaboration and data analysis. It lets teams work together from anywhere, updating information instantly. - [Notion](https://composio.dev/toolkits/notion) - Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place. - [Airtable](https://composio.dev/toolkits/airtable) - Airtable combines the flexibility of spreadsheets with the power of a database for easy project and data management. Teams use Airtable to organize, track, and collaborate with custom views and automations. - [Asana](https://composio.dev/toolkits/asana) - Asana is a collaborative work management platform for teams to organize and track projects. It streamlines teamwork, boosts productivity, and keeps everyone aligned on goals. - [Google Tasks](https://composio.dev/toolkits/googletasks) - Google Tasks is a to-do list and task management tool integrated into Gmail and Google Calendar. It helps you organize, track, and complete tasks across your Google ecosystem. - [Linear](https://composio.dev/toolkits/linear) - Linear is a modern issue tracking and project planning tool for fast-moving teams. It helps streamline workflows, organize projects, and boost productivity. - [Jira](https://composio.dev/toolkits/jira) - Jira is Atlassian’s platform for bug tracking, issue tracking, and agile project management. It helps teams organize work, prioritize tasks, and deliver projects efficiently. - [Clickup](https://composio.dev/toolkits/clickup) - ClickUp is an all-in-one productivity platform for managing tasks, docs, goals, and team collaboration. It streamlines project workflows so teams can work smarter and stay organized in one place. - [Monday](https://composio.dev/toolkits/monday) - Monday.com is a customizable work management platform for project planning and collaboration. It helps teams organize tasks, automate workflows, and track progress in real time. - [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time. - [Aeroleads](https://composio.dev/toolkits/aeroleads) - Aeroleads is a B2B lead generation platform for finding business emails and phone numbers. Grow your sales pipeline faster with powerful prospecting tools. - [Agiled](https://composio.dev/toolkits/agiled) - Agiled is an all-in-one business management platform for CRM, projects, and finance. It helps you streamline workflows, consolidate client data, and manage business processes in one place. - [Apaleo](https://composio.dev/toolkits/apaleo) - Apaleo is a cloud-based property management platform for hospitality businesses. It centralizes reservations, billing, and daily operations for smoother hotel management. - [Appointo](https://composio.dev/toolkits/appointo) - Appointo is an appointment booking platform for Shopify stores. It lets businesses add online scheduling to their websites with zero coding. - [Ascora](https://composio.dev/toolkits/ascora) - Ascora is a cloud-based field service management platform for service businesses. It streamlines scheduling, invoicing, and customer operations in one place. - [Autobound](https://composio.dev/toolkits/autobound) - Autobound is an AI-powered sales engagement platform that crafts hyper-personalized outreach and insights. It helps sales teams boost response rates and close more deals through tailored content and recommendations. - [Bart](https://composio.dev/toolkits/bart) - 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. - [Basecamp](https://composio.dev/toolkits/basecamp) - Basecamp is a project management and team collaboration tool by 37signals. It helps teams organize tasks, share files, and communicate efficiently in one place. - [Beeminder](https://composio.dev/toolkits/beeminder) - Beeminder is an online goal-tracking platform that uses monetary pledges to keep you motivated. Stay accountable and hit your targets with real financial incentives. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Scheduleonce MCP? With a standalone Scheduleonce MCP server, the agents and LLMs can only access a fixed set of Scheduleonce tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Scheduleonce and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with Pydantic AI? Yes, you can. Pydantic AI 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 Scheduleonce tools. ### Can I manage the permissions and scopes for Scheduleonce while using Tool Router? Yes, absolutely. You can configure which Scheduleonce 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. ### How safe is my data with Composio Tool Router? 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 Scheduleonce data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)