How to integrate Hookdeck MCP with Pydantic AI

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Introduction

This guide walks you through connecting Hookdeck to Pydantic AI using the Composio tool router. By the end, you'll have a working Hookdeck agent that can retry all failed webhook events from today, create a new source for github webhooks, bookmark this event for quick review later through natural language commands.

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

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

Also integrate Hookdeck with

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

The Hookdeck MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Hookdeck account. It provides structured and secure access to your webhook management platform, so your agent can perform actions like routing webhooks, managing events, configuring sources and destinations, and automating retries or cancellations on your behalf.

  • Automated event management: Let your agent bulk cancel or retry multiple webhook events, keeping your pipeline clean and efficient without manual intervention.
  • Source and destination setup: Have the agent create, configure, and manage Hookdeck sources and destinations for seamless webhook routing between services.
  • Connection orchestration: Direct your agent to establish new connections between sources and destinations, ensuring events flow exactly where you want them to go.
  • Payload transformation: Empower the agent to create custom payload transformations using JavaScript, modifying webhook data before it reaches your endpoints.
  • Bookmarking and cleanup: Ask your agent to bookmark important events for quick access or delete outdated bookmarks to keep your workspace organized.

Supported Tools & Triggers

Tools
Add Custom DomainTool to add a custom domain to the Hookdeck project.
Bulk Cancel Hookdeck EventsTool to create a bulk cancellation job for events.
Bulk Retry Hookdeck EventsInitiate a bulk retry for multiple events matching the specified filters.
Cancel Hookdeck EventCancel all future delivery attempts for a Hookdeck event.
Cancel Event Bulk RetryTool to cancel an ongoing events bulk retry operation.
Cancel Request Bulk RetryTool to cancel an in-progress requests bulk retry operation.
Cancel Hookdeck Scheduled RetriesTool to cancel all future scheduled retries for an event.
Count Hookdeck ConnectionsTool to count Hookdeck connections with optional filters.
Count Hookdeck DestinationsTool to count Hookdeck destinations with optional filters.
Count Hookdeck SourcesTool to count Hookdeck sources with optional filters.
Create Hookdeck BookmarkTool to create a bookmark for a specific event request in Hookdeck.
Create Hookdeck ConnectionTool to create a connection between a source and a destination.
Create Hookdeck DestinationTool to create a new Hookdeck destination.
Create Ignored Event Bulk RetryTool to create an ignored events bulk retry operation.
Create Hookdeck IntegrationTool to create a new Hookdeck integration.
Create Hookdeck Issue TriggerTool to create an issue trigger in Hookdeck.
Create Hookdeck SourceTool to create a new Hookdeck source.
Create Hookdeck TransformationTool to create a new Hookdeck transformation.
Delete Hookdeck BookmarkTool to delete a specific bookmark by its ID.
Delete Hookdeck ConnectionTool to delete a specific connection by its ID.
Delete Hookdeck DestinationPermanently deletes a Hookdeck destination by its ID.
Delete Hookdeck IntegrationTool to delete a specific integration by its ID.
Delete Hookdeck Issue TriggerTool to delete a specific issue trigger by its ID.
Delete Hookdeck SourceTool to delete a specific source by its ID.
Delete Hookdeck TransformationPermanently delete a Hookdeck transformation by its ID.
Disable Hookdeck ConnectionTool to disable a connection by its ID.
Disable Hookdeck DestinationTool to disable a Hookdeck destination.
Disable Hookdeck Issue TriggerTool to disable a Hookdeck issue trigger.
Disable Hookdeck SourceTool to disable a Hookdeck source.
Enable Hookdeck ConnectionTool to enable a disabled Hookdeck connection.
Enable Hookdeck DestinationEnable a previously disabled Hookdeck destination by its ID.
Enable Hookdeck Issue TriggerTool to enable a Hookdeck issue trigger.
Enable Hookdeck SourceTool to enable a disabled Hookdeck source.
Generate Event Bulk Cancel PlanTool to generate a preview plan for bulk event cancellation.
Generate Event Bulk Retry PlanTool to generate an events bulk retry plan.
Generate Ignored Event Bulk Retry PlanGenerate an ignored events bulk retry plan to estimate the scope before execution.
Generate Request Bulk Retry PlanTool to generate a requests bulk retry plan.
Get Hookdeck AttemptTool to retrieve a specific Hookdeck delivery attempt by ID.
Get attemptsLists delivery attempts for your Hookdeck account.
Get attempts metricsTool to query aggregated attempt metrics with time-based grouping and filtering.
Get Hookdeck BookmarkTool to retrieve a single bookmark by its ID.
Get Bookmark Raw BodyTool to retrieve the raw body data of a bookmarked request.
Get Hookdeck ConnectionRetrieves details of a specific Hookdeck connection by its ID.
Hookdeck: Get ConnectionsTool to list Hookdeck connections.
Get Hookdeck DestinationRetrieve details of a specific Hookdeck destination by ID.
Hookdeck: Get DestinationsTool to list Hookdeck destinations.
Get EventTool to retrieve a specific Hookdeck event by ID.
Get Event Bulk Cancel StatusTool to retrieve the status of a bulk event cancellation operation.
Get Event Bulk CancelsTool to list event bulk cancel operations for your Hookdeck account.
Get Event Bulk RetriesTool to retrieve bulk retry operations for Hookdeck events.
Get Event Bulk Retry StatusTool to retrieve the status of a bulk event retry operation.
Get Event Raw BodyTool to retrieve the raw body data of an event.
Get eventsTool to list events for your Hookdeck account.
Get events by issue metricsTool to query event metrics grouped by individual issue IDs.
Get Events MetricsTool to query aggregated event metrics with time-based grouping and filtering.
Get events pending timeseries metricsTool to query aggregated events pending timeseries metrics with time-based grouping and filtering.
Get Ignored Event Bulk RetriesTool to retrieve ignored events bulk retry operations for Hookdeck.
Get Ignored Event Bulk Retry StatusTool to retrieve the status of an ignored events bulk retry operation.
Get Hookdeck IntegrationTool to retrieve details of a specific Hookdeck integration.
Get Hookdeck IntegrationsTool to retrieve a list of Hookdeck integrations.
Get Hookdeck Issue CountTool to get the count of Hookdeck issues with optional filters.
Get Hookdeck Issue TriggerTool to retrieve a single Hookdeck issue trigger by its ID.
Get issue triggersTool to list issue triggers for your Hookdeck account.
Get Queue Depth MetricsTool to query queue depth metrics for destinations (pending events count and age).
Get Hookdeck RequestRetrieve detailed information about a specific Hookdeck request by ID.
Get Request Bulk RetriesTool to retrieve bulk retry operations for Hookdeck requests.
Get Request Bulk Retry StatusTool to retrieve the status of a requests bulk retry operation.
Get Request EventsTool to retrieve events associated with a specific Hookdeck request.
Get Request Ignored EventsRetrieve the list of ignored events for a specific Hookdeck request.
Get Request Raw BodyTool to retrieve the raw body data of a request.
Hookdeck: Get RequestsTool to list Hookdeck requests.
Get requests metricsTool to query aggregated request metrics with time-based grouping and filtering.
Get Hookdeck SourceTool to retrieve details of a specific Hookdeck source.
Get sourcesTool to retrieve all sources associated with your Hookdeck account.
Get Hookdeck TransformationRetrieves the complete details of a specific Hookdeck transformation by its ID.
Get Transformation ExecutionRetrieve a specific transformation execution by transformation ID and execution ID.
Get transformation executionsTool to retrieve executions for a specific Hookdeck transformation.
Get transformationsTool to list Hookdeck transformations.
Get Transformations CountTool to get the count of Hookdeck transformations with optional filters.
Get transformations metricsTool to query aggregated transformation execution metrics with time-based grouping and filtering.
List Hookdeck BookmarksTool to list bookmarks.
List Custom DomainsTool to list all custom domains and their verification statuses for the Hookdeck project.
Hookdeck: List IssuesTool to list all issues detected in your Hookdeck account.
Hookdeck Pause ConnectionTool to pause a Hookdeck connection.
Publish Event to HookdeckTool to publish a webhook event to Hookdeck using the Publish API.
Replay Hookdeck EventReplay (retry) a specific Hookdeck event delivery.
Resolve Hookdeck IssueTool to resolve a Hookdeck issue.
Retrieve Hookdeck IssueRetrieves detailed information about a specific Hookdeck issue by its ID.
Send Hookdeck Source RequestTool to send HTTP requests to a Hookdeck Source URL.
Test Hookdeck TransformationTool to test a Hookdeck transformation code before deploying it.
Toggle Webhook NotificationsTool to toggle webhook notifications for the project.
Trigger Hookdeck BookmarkTrigger a Hookdeck bookmark to replay its stored webhook request.
Unpause Hookdeck ConnectionTool to unpause a paused Hookdeck connection.
Update Hookdeck BookmarkTool to update an existing bookmark in Hookdeck.
Hookdeck Update ConnectionUpsert (create or update) a Hookdeck connection between a source and destination.
Update Connection by IDTool to update an existing Hookdeck connection by its ID.
Update Hookdeck DestinationTool to update an existing Hookdeck destination.
Update Hookdeck IntegrationTool to update an existing Hookdeck integration.
Update Hookdeck Issue TriggerTool to update an issue trigger in Hookdeck.
Update Hookdeck SourceUpdate an existing Hookdeck source's name, type, or description.
Update Hookdeck TransformationTool to update an existing Hookdeck transformation.
Upsert Hookdeck DestinationTool to create or update a Hookdeck destination.
Upsert Hookdeck Issue TriggerTool to create or update an issue trigger in Hookdeck using upsert semantics.
Upsert Hookdeck SourceTool to create or update a Hookdeck source by name.
Upsert Hookdeck TransformationTool to create or update a Hookdeck transformation by name.

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

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

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.

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 Hookdeck
  • pydantic-ai lets you create structured AI agents with tool support
  • python-dotenv loads your environment variables securely from a .env file

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

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 Hookdeck
  • MCPServerStreamableHTTP connects to the Hookdeck MCP server endpoint
  • Agent from Pydantic AI lets you define and run the AI assistant

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 Hookdeck
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["hookdeck"],
    )
    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 Hookdeck 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

Initialize the Pydantic AI Agent

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

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 Hookdeck.\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
  • Hookdeck API calls happen automatically under the hood
  • The model keeps conversation history to maintain context across turns

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

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FAQ

What are the differences in Tool Router MCP and Hookdeck MCP?

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

Can I manage the permissions and scopes for Hookdeck while using Tool Router?

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

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