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How to integrate Fillout forms MCP with Pydantic AI

Connect Pydantic AI to Fillout forms MCP. List all your active fillout forms, show details for your latest created form, and more using natural language, with authentication handled for you.

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Api Key

Fillout forms is an online platform for building and managing forms with a flexible API. It lets you create, distribute, and collect responses from forms with ease.

22 Tools

Introduction

This guide walks you through connecting Fillout forms to Pydantic AI using the Composio tool router. By the end, you'll have a working Fillout forms agent that can list forms, create databases and tables, add and update records, manage fields, and set up webhooks through natural language commands.

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

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

Also integrate Fillout forms with

Claude CodeClaude CoworkOpenAI Agents SDKClaude Agent SDKGrok BotCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIAutoGen

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 Fillout forms
  • 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 Fillout forms 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 Fillout forms MCP server, and what's possible with it?

The Fillout forms MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Fillout account. It provides structured and secure access to your forms and form management tools, so your agent can fetch form data, list all your forms, manage authorization, and help automate form workflows on your behalf.

  • Comprehensive form listing: Instantly retrieve and display a list of all forms in your Fillout account, making it easy to review and manage your surveys and data collection tools.
  • Seamless authorization management: Let your agent handle the OAuth authorization flow for securely connecting third-party applications to your Fillout account—no manual steps required.
  • Token revocation and security: Instruct your agent to programmatically invalidate or revoke access tokens, ensuring that only trusted applications and users have access to your Fillout data.
  • Automated workflow integration: Use your agent to connect Fillout forms with other apps or workflows, streamlining data collection and processing without manual intervention.

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 Fillout forms
  • 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 Fillout forms
  • MCPServerStreamableHTTP connects to the Fillout forms 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 Fillout forms
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["fillout_forms"],
    )
    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 Fillout forms 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
fillout_forms_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[fillout_forms_mcp],
    instructions=(
        "You are a Fillout forms assistant. Use Fillout forms tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Fillout forms endpoint
  • The agent uses GPT-5 to interpret user commands and perform Fillout forms 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 Fillout forms.\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
  • Fillout forms 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 Fillout forms 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 Fillout forms
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["fillout_forms"],
    )
    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
    fillout_forms_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[fillout_forms_mcp],
        instructions=(
            "You are a Fillout forms assistant. Use Fillout forms 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 Fillout forms.\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 Fillout forms through Composio's Tool Router. With this setup, your agent can perform real Fillout forms 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 + Fillout forms 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 Fillout forms action and event your agent gets out of the box.

Authorize OAuth

Tool to initiate the OAuth authorization process for third-party applications.

Create Database

Tool to create a new Zite database instance with tables and fields.

Create Database Webhook

Tool to create a webhook subscription for a Fillout database.

Create field

Tool to add a new field to an existing table with specified type, name, and configuration.

Create record

Tool to create a new record in a Fillout table with the provided field data.

Create table

Tool to add a new table with custom schema to an existing database.

Delete database

Tool to permanently delete a database and all its data including tables, fields, views, and records.

Delete database webhook

Tool to remove a webhook subscription from a Fillout database.

Delete field

Tool to permanently delete a field from a table.

Delete record

Tool to permanently delete a record from a table in Fillout Database.

Delete table

Tool to permanently delete a table and all its data including fields, views, and records from a Fillout database.

Get database by ID

Tool to retrieve detailed information about a specific database including all tables, fields, and views.

Get databases

Tool to retrieve a list of all databases for your organization.

Get forms

Tool to retrieve a list of all forms in your account.

Get record by ID

Tool to retrieve a single record by its UUID with all field data.

Invalidate Access Token

Request invalidation of a Fillout OAuth access token using an Authorization bearer header.

List database webhooks

List webhook subscriptions configured for a specified Fillout database.

List Records

Tool to retrieve records from a Fillout table with filtering, sorting, and pagination.

Remove form webhook

Tool to remove a webhook by its ID.

Update field

Tool to modify field properties and configuration for an existing field in a Fillout database table.

Update record

Tool to update specific fields of an existing record in a Fillout table.

Update table

Tool to update table properties like name.

FRAMEWORKS

How to build Fillout forms MCP Agent with another framework

Claude Code logo

Claude Code

Use Fillout forms MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Fillout forms MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Fillout forms MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Fillout forms MCP with Claude Agent SDK

Grok Bot logo

Grok Bot

Use Fillout forms MCP with Grok Bot

Codex logo

Codex

Use Fillout forms MCP with Codex

OpenClaw logo

OpenClaw

Use Fillout forms MCP with OpenClaw

Hermes logo

Hermes

Use Fillout forms MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Fillout forms MCP with Atomic Agent

Google ADK logo

Google ADK

Use Fillout forms MCP with Google ADK

LangChain logo

LangChain

Use Fillout forms MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Fillout forms MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Fillout forms MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Fillout forms MCP with LlamaIndex

CrewAI logo

CrewAI

Use Fillout forms MCP with CrewAI

AutoGen logo

AutoGen

Use Fillout forms MCP with AutoGen

FAQ

Frequently asked questions

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

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

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