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How to integrate Api2pdf MCP with Pydantic AI

Connect Pydantic AI to Api2pdf MCP. Merge monthly invoices into one pdf, extract specific pages from a large pdf, and more using natural language, with authentication handled for you.

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Api2Pdf is a REST API for generating PDFs from HTML, URLs, and documents using powerful engines like wkhtmltopdf and Headless Chrome. It streamlines document conversion and automation for developers and businesses.

10 Tools

Introduction

This guide walks you through connecting Api2pdf to Pydantic AI using the Composio tool router. By the end, you'll have a working Api2pdf agent that can merge and optimize PDFs, extract and reorder pages, add headers and footers, and generate barcodes and QR codes through natural language commands.

This guide will help you understand how to give your Pydantic AI agent real control over a Api2pdf account through Composio's Api2pdf MCP server.

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

Also integrate Api2pdf 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 Api2pdf
  • 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 Api2pdf 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 Api2pdf MCP server, and what's possible with it?

The API2PDF MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your API2PDF account. It provides structured and secure access to PDF and document processing tools, so your agent can create PDFs with headers and footers, merge documents, rearrange pages, reduce file sizes, and generate barcodes or QR codes on your behalf.

  • PDF creation and customization: Have your agent convert HTML into a PDF with customizable headers and footers using Headless Chrome.
  • Document assembly and page control: Direct your agent to merge multiple PDFs, extract selected pages, or reorder pages into a new sequence.
  • PDF optimization and conversion: Let the agent reduce a PDF's file size or convert a PDF document into HTML using LibreOffice.
  • Document thumbnail generation: Instruct your agent to create a thumbnail image from a document using LibreOffice.
  • Barcode and QR code creation: Have your agent generate barcodes or QR codes for labels, documents, and other workflows.

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 Api2pdf
  • 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 Api2pdf
  • MCPServerStreamableHTTP connects to the Api2pdf 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 Api2pdf
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["api2pdf"],
    )
    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 Api2pdf 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
api2pdf_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[api2pdf_mcp],
    instructions=(
        "You are a Api2pdf assistant. Use Api2pdf tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Api2pdf endpoint
  • The agent uses GPT-5 to interpret user commands and perform Api2pdf 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 Api2pdf.\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
  • Api2pdf 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 Api2pdf 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 Api2pdf
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["api2pdf"],
    )
    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
    api2pdf_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[api2pdf_mcp],
        instructions=(
            "You are a Api2pdf assistant. Use Api2pdf 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 Api2pdf.\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 Api2pdf through Composio's Tool Router. With this setup, your agent can perform real Api2pdf 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 + Api2pdf 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 Api2pdf action and event your agent gets out of the box.

Add Header Footer

Convert HTML to PDF with customizable headers and footers using Headless Chrome.

Check API Status

Tool to check the health status of the API2PDF service.

Delete PDF

Delete a previously generated PDF from API2PDF storage by its response ID.

Extract PDF Pages

Tool to extract specific pages from a PDF document.

LibreOffice PDF to HTML

Tool to convert a PDF document to HTML using LibreOffice.

LibreOffice Thumbnail

Tool to generate a thumbnail image of a document using LibreOffice.

Merge PDFs

Merge multiple PDF documents into a single PDF file.

Optimize PDF

Tool to optimize a PDF document to reduce file size while maintaining quality.

Reorder PDF Pages

Reorder pages of a PDF using a source URL and a list of zero-based page indices in the desired order.

Generate Barcode or QR Code

Request a barcode or QR code for a text value using ZXing.

FRAMEWORKS

How to build Api2pdf MCP Agent with another framework

Claude Code logo

Claude Code

Use Api2pdf MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Api2pdf MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Api2pdf MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Api2pdf MCP with Claude Agent SDK

Codex logo

Codex

Use Api2pdf MCP with Codex

OpenClaw logo

OpenClaw

Use Api2pdf MCP with OpenClaw

Hermes logo

Hermes

Use Api2pdf MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Api2pdf MCP with Atomic Agent

Google ADK logo

Google ADK

Use Api2pdf MCP with Google ADK

LangChain logo

LangChain

Use Api2pdf MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Api2pdf MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Api2pdf MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Api2pdf MCP with LlamaIndex

CrewAI logo

CrewAI

Use Api2pdf MCP with CrewAI

AutoGen logo

AutoGen

Use Api2pdf MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Api2pdf MCP server, the agents and LLMs can only access a fixed set of Api2pdf tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Api2pdf 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 Api2pdf tools.

Yes, absolutely. You can configure which Api2pdf 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 Api2pdf data and credentials are handled as safely as possible.

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