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How to integrate Placekey MCP with Pydantic AI

Connect Pydantic AI to Placekey MCP. Find placekey for this street address, get latitude and longitude from an address, and more using natural language, with authentication handled for you.

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Placekey standardizes and unifies location data by assigning unique IDs to addresses. It simplifies address matching and enables seamless data sharing across platforms.

4 Tools

Introduction

This guide walks you through connecting Placekey to Pydantic AI using the Composio tool router. By the end, you'll have a working Placekey agent that can generate Placekeys from addresses, geocode addresses, and look up Placekeys in bulk through natural language commands.

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

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

Also integrate Placekey with

Claude CodeClaude CoworkOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic 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 Placekey
  • 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 Placekey 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 Placekey MCP server, and what's possible with it?

The Placekey MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Placekey account. It provides structured and secure access to location standardization tools, so your agent can perform actions like converting addresses to Placekeys, retrieving geocodes, and mapping locations on your behalf.

  • Address to Placekey conversion: Instantly convert any physical address into a unique Placekey identifier for seamless data matching and enrichment.
  • Geocode retrieval from address: Have your agent fetch latitude, longitude, and full geocode details for any address, complete with Placekey and location info.
  • Placekey generation from coordinates: Quickly generate a Placekey for any geographic coordinates, making it easy to standardize and deduplicate location data.
  • Location deduplication and validation: Let your agent use Placekeys to match, validate, and deduplicate different representations of the same physical place across your datasets.

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

Get Geocode From Address

This tool retrieves geocode information (latitude and longitude) for a given address using the Placekey API.

Get Placekey

Tool to get a Placekey for a single location using address, coordinates, or POI details.

Get placekey from address

Convert a physical address into a unique Placekey identifier.

Get Placekeys Bulk

Get Placekeys for multiple locations in bulk (up to 100 queries per request).

FRAMEWORKS

How to build Placekey MCP Agent with another framework

Claude Code logo

Claude Code

Use Placekey MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Placekey MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Placekey MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Placekey MCP with Claude Agent SDK

Codex logo

Codex

Use Placekey MCP with Codex

OpenClaw logo

OpenClaw

Use Placekey MCP with OpenClaw

Hermes logo

Hermes

Use Placekey MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Placekey MCP with Atomic Agent

Google ADK logo

Google ADK

Use Placekey MCP with Google ADK

LangChain logo

LangChain

Use Placekey MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Placekey MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Placekey MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Placekey MCP with LlamaIndex

CrewAI logo

CrewAI

Use Placekey MCP with CrewAI

AutoGen logo

AutoGen

Use Placekey MCP with AutoGen

FAQ

Frequently asked questions

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