How to integrate HTML/CSS to Image MCP with Pydantic AI

This guide walks you through connecting HTML/CSS to Image to Pydantic AI using the Composio tool router. By the end, you'll have a working HTML/CSS to Image agent that can render html as images, create images from templates, transform images, manage templates, and track usage through natural language commands. This guide will help you understand how to give your Pydantic AI agent real control over a HTML/CSS to Image account through Composio's HTML/CSS to Image MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Api Key

HTML/CSS to Image is an API for converting HTML, CSS, URLs, and templates into images and PDFs. Use it to generate clean visual assets, screenshots, and documents without running browser infrastructure.

10 Tools

Introduction

This guide walks you through connecting HTML/CSS to Image to Pydantic AI using the Composio tool router. By the end, you'll have a working HTML/CSS to Image agent that can render html as images, create images from templates, transform images, manage templates, and track usage through natural language commands.

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

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

Also integrate HTML/CSS to Image 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 HTML/CSS to Image
  • 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 HTML/CSS to Image 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 HTML/CSS to Image MCP server, and what's possible with it?

The HTML/CSS to Image MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your HTML/CSS to Image account. It provides structured and secure access to your image generation, reusable templates, generated files, and usage data, so your agent can create images, render templates, transform files, manage templates, and monitor usage on your behalf.

  • HTML and webpage rendering: Have your agent turn HTML and CSS or public web pages into hosted images, including protected pages that require request headers.
  • Batch image creation: Direct your agent to generate up to 25 images at once from HTML, CSS, or web pages using shared or image-specific settings.
  • Reusable template management: Let the agent create Handlebars templates, list your existing templates, and update them with new HTML, CSS, or render settings.
  • Image retrieval and transformation: Instruct your agent to download generated images, convert their format, resize them, crop them, or permanently delete files you no longer need.
  • Account usage tracking: Have your agent review recent hourly, daily, monthly, and billing-period image usage for your connected account.

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

Create Image

Create a hosted image from HTML/CSS or an internet-reachable webpage, including authenticated pages using request headers.

Create Image from Template

Create an image from a reusable template using the latest version or an explicitly selected version.

Create Images Batch

Create 1 to 25 hosted images from HTML/CSS or internet-reachable webpages in one request, including authenticated pages using shared or per-image headers.

Create Template

Create a reusable Handlebars HTML/CSS image template.

Delete Image

Permanently delete one generated image and clear its HCTI CDN cache.

Delete Images Batch

Permanently delete multiple generated images and clear their HCTI CDN caches.

Get or Transform Image

Download a generated image by ID, optionally converting its format, resizing it, or cropping it.

Get Usage

Return recent hourly, daily, monthly, and billing-period image usage for the connected account.

List Templates

List reusable image templates owned by the connected account, including their current version, source, and render settings.

Update Template

Create a new version of an existing template using replacement Handlebars HTML and optional CSS or render settings.

FRAMEWORKS

How to build HTML/CSS to Image MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use HTML/CSS to Image MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use HTML/CSS to Image MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use HTML/CSS to Image MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use HTML/CSS to Image MCP with Claude Cowork

Codex logo

Codex

Use HTML/CSS to Image MCP with Codex

OpenClaw logo

OpenClaw

Use HTML/CSS to Image MCP with OpenClaw

Hermes logo

Hermes

Use HTML/CSS to Image MCP with Hermes

CLI logo

CLI

Use HTML/CSS to Image MCP with CLI

Google ADK logo

Google ADK

Use HTML/CSS to Image MCP with Google ADK

LangChain logo

LangChain

Use HTML/CSS to Image MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use HTML/CSS to Image MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use HTML/CSS to Image MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use HTML/CSS to Image MCP with LlamaIndex

CrewAI logo

CrewAI

Use HTML/CSS to Image MCP with CrewAI

FAQ

Frequently asked questions

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

Yes, absolutely. You can configure which HTML/CSS to Image 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 HTML/CSS to Image data and credentials are handled as safely as possible.

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