How to integrate Nutrient Document Web Services API MCP with Pydantic AI

This guide walks you through connecting Nutrient Document Web Services API to Pydantic AI using the Composio tool router. By the end, you'll have a working Nutrient Document Web Services API agent that can build documents, convert web pages to pdfs, ocr scanned pdfs, stage redactions, and add watermarks through natural language commands. This guide will help you understand how to give your Pydantic AI agent real control over a Nutrient Document Web Services API account through Composio's Nutrient Document Web Services API MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Nutrient Document Web Services API is a cloud document processing service for converting, OCRing, redacting, signing, and analyzing files. Use it to automate complex PDF and document workflows without running document infrastructure yourself.

11 Tools

Introduction

This guide walks you through connecting Nutrient Document Web Services API to Pydantic AI using the Composio tool router. By the end, you'll have a working Nutrient Document Web Services API agent that can build documents, convert web pages to pdfs, ocr scanned pdfs, stage redactions, and add watermarks through natural language commands.

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

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

Also integrate Nutrient Document Web Services 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 Nutrient Document Web Services 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 Nutrient Document Web Services 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 Nutrient Document Web Services API MCP server, and what's possible with it?

The Nutrient Document Web Services 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 Nutrient Document Web Services API account. It provides structured and secure access to document processing and account usage, so your agent can create and convert documents, OCR and improve PDFs, stage redactions, add watermarks, and check costs and usage on your behalf.

  • Document creation and conversion: Have your agent build documents from remote files, HTML, and new pages, or convert Markdown and public web pages into PDFs.
  • Searchable and accessible PDFs: Let the agent apply OCR to scanned PDFs or add screen-reader tags for PDF/UA accessibility.
  • Redaction review: Direct your agent to find matching content in a remote PDF and prepare a review copy with unapplied redaction marks.
  • PDF watermarking: Instruct your agent to add positioned text or image watermarks to every page of a PDF.
  • Cost and usage checks: Have your agent estimate a document job's required credits before processing, then review subscription status, remaining credits, and Processor usage.

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

Analyze Build Cost

Estimate the credits and Processor features required by Build API instructions without executing the document job or consuming credits.

Build Document

Synchronously create one document from remote files, remote HTML, new pages, and composable safe actions, returning its filename, media type, and Base64 content up to 4 MB.

Convert Markdown to PDF

Convert CommonMark or GitHub-Flavored Markdown text into a PDF using optional built-in styling, custom CSS, page layout, and syntax highlighting settings.

Create PDF from Web Page

Render an HTML web page at a public URL, with optional page layout settings, into a PDF.

Get Account Information

Return the connected Nutrient account's subscription type, status, and estimated remaining credits.

Get Processor Usage

Return the connected account's Processor subscription status and credit usage counters.

Make PDF Accessible

Auto-tag a PDF at a remote URL for PDF/UA screen-reader accessibility and return the result's filename, media type, and Base64 content up to 4 MB.

OCR PDF

Apply optical character recognition to a PDF at a remote URL and return a searchable PDF's filename, media type, and Base64 content up to 4 MB.

Revoke JWT Token

Immediately revoke a bearer token created by CREATE_JWT_TOKEN using its ID.

Stage PDF Redactions

Find matching content in a remote PDF and return a review PDF's filename, media type, and Base64 content up to 4 MB with unapplied redaction marks.

Watermark PDF

Add a positioned text or image watermark to every page of a PDF at a public URL and return the copy's filename, media type, and Base64 content up to 4 MB.

FRAMEWORKS

How to build Nutrient Document Web Services API MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Nutrient Document Web Services API MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Nutrient Document Web Services API MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Nutrient Document Web Services API MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Nutrient Document Web Services API MCP with Claude Cowork

Codex logo

Codex

Use Nutrient Document Web Services API MCP with Codex

OpenClaw logo

OpenClaw

Use Nutrient Document Web Services API MCP with OpenClaw

Hermes logo

Hermes

Use Nutrient Document Web Services API MCP with Hermes

CLI logo

CLI

Use Nutrient Document Web Services API MCP with CLI

Google ADK logo

Google ADK

Use Nutrient Document Web Services API MCP with Google ADK

LangChain logo

LangChain

Use Nutrient Document Web Services API MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Nutrient Document Web Services API MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Nutrient Document Web Services API MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Nutrient Document Web Services API MCP with LlamaIndex

CrewAI logo

CrewAI

Use Nutrient Document Web Services API MCP with CrewAI

FAQ

Frequently asked questions

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

Yes, absolutely. You can configure which Nutrient Document Web Services 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 Nutrient Document Web Services API data and credentials are handled as safely as possible.

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