How to integrate Cronfree Time Scheduler MCP with Pydantic AI

This guide walks you through connecting Cronfree Time Scheduler to Pydantic AI using the Composio tool router. By the end, you'll have a working Cronfree Time Scheduler agent that can create weekday webhook for daily reports, remove outdated billing reminder schedule, schedule timezone-aware monthly cleanup webhook through natural language commands. This guide will help you understand how to give your Pydantic AI agent real control over a Cronfree Time Scheduler account through Composio's Cronfree Time Scheduler MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

Get started for freeGet a demo
Cronfree Time Scheduler logoCronfree Time Scheduler
Api Key

Cronfree Time Scheduler is an API-based scheduler for recurring webhook calls. Use it to create and remove timezone-aware schedules without running cron.

2 Tools

Introduction

This guide walks you through connecting Cronfree Time Scheduler to Pydantic AI using the Composio tool router. By the end, you'll have a working Cronfree Time Scheduler agent that can create weekday webhook for daily reports, remove outdated billing reminder schedule, schedule timezone-aware monthly cleanup webhook through natural language commands.

This guide will help you understand how to give your Pydantic AI agent real control over a Cronfree Time Scheduler account through Composio's Cronfree Time Scheduler MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Cronfree Time Scheduler with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAI

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 Cronfree Time Scheduler
  • 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 Cronfree Time Scheduler 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 Cronfree Time Scheduler MCP server, and what's possible with it?

The Cronfree Time Scheduler MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Cronfree Time Scheduler account. It provides structured and secure access to your recurring webhook schedules, so your agent can create schedules, choose precise delivery times, apply timezones, and remove schedules on your behalf.

  • Recurring webhook scheduling: Have your agent create a recurring schedule that sends requests to your chosen webhook.
  • Flexible calendar timing: Instruct your agent to schedule webhook calls by weekday, month, day of the month, hour, and minute.
  • Timezone-aware delivery: Let the agent apply an IANA timezone so each recurring webhook runs at the intended local time.
  • Schedule removal: Direct your agent to remove the recurring schedule associated with a webhook when it is no longer needed.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
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
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard 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.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

bash
pip install composio pydantic-ai python-dotenv

Install the required libraries.

What's happening:

  • composio connects your agent to external SaaS tools like Cronfree Time Scheduler
  • pydantic-ai lets you create structured AI agents with tool support
  • python-dotenv loads your environment variables securely from a .env file
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key

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
5

Import dependencies

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()
What's happening:
  • We load environment variables and import required modules
  • Composio manages connections to Cronfree Time Scheduler
  • MCPServerStreamableHTTP connects to the Cronfree Time Scheduler MCP server endpoint
  • Agent from Pydantic AI lets you define and run the AI assistant
6

Create a Tool Router Session

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 Cronfree Time Scheduler
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["cronfree_time_scheduler"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")
What's happening:
  • We're creating a Tool Router session that gives your agent access to Cronfree Time Scheduler 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
7

Initialize the Pydantic AI Agent

python
# Attach the MCP server to a Pydantic AI Agent
cronfree_time_scheduler_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[cronfree_time_scheduler_mcp],
    instructions=(
        "You are a Cronfree Time Scheduler assistant. Use Cronfree Time Scheduler tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Cronfree Time Scheduler endpoint
  • The agent uses GPT-5 to interpret user commands and perform Cronfree Time Scheduler operations
  • The instructions field defines the agent's role and behavior
8

Build the chat interface

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 Cronfree Time Scheduler.\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()
What's happening:
  • The agent reads input from the terminal and streams its response
  • Cronfree Time Scheduler API calls happen automatically under the hood
  • The model keeps conversation history to maintain context across turns
9

Run the application

python
if __name__ == "__main__":
    asyncio.run(main())
What's happening:
  • The asyncio loop launches the agent and keeps it running until you exit

Complete Code

Here's the complete code to get you started with Cronfree Time Scheduler and Pydantic AI:

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 Cronfree Time Scheduler
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["cronfree_time_scheduler"],
    )
    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
    cronfree_time_scheduler_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[cronfree_time_scheduler_mcp],
        instructions=(
            "You are a Cronfree Time Scheduler assistant. Use Cronfree Time Scheduler 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 Cronfree Time Scheduler.\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 Cronfree Time Scheduler through Composio's Tool Router. With this setup, your agent can perform real Cronfree Time Scheduler 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 + Cronfree Time Scheduler for workflow automation)
This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations.
TOOLS

Supported Tools

Every Cronfree Time Scheduler action and event your agent gets out of the box.

Create Recurring Webhook Schedule

Create a Cronfree schedule that repeatedly POSTs to a webhook URL at times selected by weekday, month, month-day, hour, minute, and IANA timezone.

Remove Recurring Webhook Schedule

Remove the Cronfree recurring schedule associated with a webhook URL.

FRAMEWORKS

How to build Cronfree Time Scheduler MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Cronfree Time Scheduler MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Cronfree Time Scheduler MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Cronfree Time Scheduler MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Cronfree Time Scheduler MCP with Claude Cowork

Codex logo

Codex

Use Cronfree Time Scheduler MCP with Codex

OpenClaw logo

OpenClaw

Use Cronfree Time Scheduler MCP with OpenClaw

Hermes logo

Hermes

Use Cronfree Time Scheduler MCP with Hermes

CLI logo

CLI

Use Cronfree Time Scheduler MCP with CLI

Google ADK logo

Google ADK

Use Cronfree Time Scheduler MCP with Google ADK

LangChain logo

LangChain

Use Cronfree Time Scheduler MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Cronfree Time Scheduler MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Cronfree Time Scheduler MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Cronfree Time Scheduler MCP with LlamaIndex

CrewAI logo

CrewAI

Use Cronfree Time Scheduler MCP with CrewAI

FAQ

Frequently asked questions

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

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 Cronfree Time Scheduler tools.

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

Start with Cronfree Time Scheduler.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Cronfree Time Scheduler tool your agent needs.Free to start.

Start building
Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREEBOOK A DEMO
agent.aiZoomLettaGleanHubSpotAWSWabi

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola
Tomisin Jenrola
Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche
Jerome Leclanche
Co-Founder, Ingram Technologies