How to integrate RedCircle API MCP with Pydantic AI

This guide walks you through connecting RedCircle API to Pydantic AI using the Composio tool router. By the end, you'll have a working RedCircle API agent that can search target for nintendo switch bundles, get reviews for dyson vacuums at target, list top-rated target products in electronics through natural language commands. This guide will help you understand how to give your Pydantic AI agent real control over a RedCircle API account through Composio's RedCircle API MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Introduction

This guide walks you through connecting RedCircle API to Pydantic AI using the Composio tool router. By the end, you'll have a working RedCircle API agent that can search target for nintendo switch bundles, get reviews for dyson vacuums at target, list top-rated target products in electronics through natural language commands.

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

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

Also integrate RedCircle API 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 RedCircle API
  • 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 RedCircle API 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 RedCircle API MCP server, and what's possible with it?

The RedCircle API MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your RedCircle API account. It provides structured and secure access so your agent can perform RedCircle API operations on your behalf.

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

Add Zipcodes

Tool to add zipcodes to your RedCircle API account for geolocation targeting.

Clear Collection Requests

Tool to remove all requests from a specified collection.

Create Collection

Tool to create a new collection for running up to 15,000 requests on a schedule.

Create Destination

Tool to create a new destination for uploading Collection Result Sets to cloud storage.

Create Requests

Tool to add up to 1,000 requests to an existing collection.

Delete Collection

Tool to remove a collection from the system by ID.

Delete Destination

Tool to remove a destination from your RedCircle API account.

Delete Request from Collection

Tool to remove an individual request from a collection.

Delete Requests In Bulk

Tool to delete multiple requests from a collection in bulk.

Delete Zipcodes

Tool to remove zipcodes from your RedCircle API account.

Get Account Information

Tool to retrieve account information, usage metrics, and platform status.

Get Collection

Tool to retrieve complete information about a specific collection.

Get Requests CSV Links

Tool to retrieve CSV download links for all requests in a collection.

Get Requests JSON Links

Tool to retrieve download links for all requests in a collection in JSON format.

Get Result Set CSV

Tool to retrieve a result set in CSV format with optional field filtering.

Get Result Set JSON

Tool to retrieve a result set in JSON format with download links.

Get Result Set JSON Lines

Tool to retrieve a result set in JSON Lines format with download links.

Get Target Product Data

Tool to retrieve Target data in real-time including search results, product information, reviews, or category listings.

List Categories

Tool to retrieve all top-level (root) categories or filter results using optional parameters.

List Collections

Tool to retrieve all collections configured on your RedCircle API account with filtering and pagination.

List Destinations

Tool to retrieve all destinations configured on your RedCircle API account with pagination and filtering.

List Error Logs

Tool to list all error logs on your RedCircle API account.

List Requests by Page

Tool to retrieve requests for a collection in paginated format.

List Result Sets

Tool to list all result sets for a collection.

List Zipcodes

Tool to retrieve all zipcodes associated with your account with optional filtering.

Resend Webhook

Tool to resend a previously configured webhook POST request for a result set.

Start Collection

Tool to initiate execution of a RedCircle API collection.

Stop All Collections

Tool to halt all currently active collections on your account.

Stop Collection

Tool to halt an active collection in queued or running state.

Update Collection

Tool to update an existing collection's configuration and settings.

Update Destination

Tool to modify an existing destination configuration on your RedCircle API account.

Update Request

Tool to modify a request within a collection.

FRAMEWORKS

How to build RedCircle API MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use RedCircle API MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use RedCircle API MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use RedCircle API MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use RedCircle API MCP with Claude Cowork

Codex logo

Codex

Use RedCircle API MCP with Codex

OpenClaw logo

OpenClaw

Use RedCircle API MCP with OpenClaw

Hermes logo

Hermes

Use RedCircle API MCP with Hermes

CLI logo

CLI

Use RedCircle API MCP with CLI

Google ADK logo

Google ADK

Use RedCircle API MCP with Google ADK

LangChain logo

LangChain

Use RedCircle API MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use RedCircle API MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use RedCircle API MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use RedCircle API MCP with LlamaIndex

CrewAI logo

CrewAI

Use RedCircle API MCP with CrewAI

FAQ

Frequently asked questions

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

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

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