How to integrate Encodian MCP with Google ADK

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Introduction

This guide walks you through connecting Encodian to Google ADK using the Composio tool router. By the end, you'll have a working Encodian agent that can resize all images in project folder, extract author and page count from pdf, add custom header to every pdf file through natural language commands.

This guide will help you understand how to give your Google ADK agent real control over a Encodian account through Composio's Encodian MCP server.

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

Also integrate Encodian with

TL;DR

Here's what you'll learn:
  • Get a Encodian account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for Encodian
  • Build an agent that connects to Encodian through MCP
  • Interact with Encodian using natural language

What is Google ADK?

Google ADK (Agents Development Kit) is Google's framework for building AI agents powered by Gemini models. It provides tools for creating agents that can use external services through the Model Context Protocol.

Key features include:

  • Gemini Integration: Native support for Google's Gemini models
  • MCP Toolset: Built-in support for Model Context Protocol tools
  • Streamable HTTP: Connect to external services through streamable HTTP
  • CLI and Web UI: Run agents via command line or web interface

What is the Encodian MCP server, and what's possible with it?

The Encodian MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Encodian account. It provides structured and secure access to your Encodian document automation suite, so your agent can perform actions like managing files, processing PDFs, encoding or decoding content, and automating workflow tasks on your behalf.

  • File management and property retrieval: Quickly get detailed information about files, move documents between containers, and keep your Microsoft 365 storage organized automatically.
  • Document processing and automation: Direct your agent to add headers and footers to PDFs, extract PDF metadata, or resize images for seamless document formatting and compliance tasks.
  • Base64 content conversion: Effortlessly encode text or files to Base64, or decode Base64 strings back to usable files for secure data exchange and workflow integration.
  • Archive extraction and manipulation: Unzip files and retrieve their contents, making it easy to automate bulk document handling or trigger downstream processing steps.
  • Data integrity and comparison tools: Use hashing and text comparison utilities to verify file integrity, detect changes, or ensure consistency across your documents and workflows.

Supported Tools & Triggers

Tools
Add Attachments to PDFTool to add file attachments to a PDF document.
Add Image Watermark to PDFTool to add an image watermark to a PDF document.
Add Image Watermark to PDF (Advanced)Tool to add an advanced image watermark to a PDF with precise control over positioning, opacity, scale, quality, and rotation.
Array Add ItemsTool to add items to a JSON array at a specified position (first, last, or specific index).
Create ZIP ArchiveTool to create a ZIP archive from multiple documents.
Apply AI OCR to PDFTool to apply AI-powered OCR to a PDF document with optional preprocessing filters.
Apply OCR to PDF (Standard)Tool to apply standard OCR to a PDF document with optional preprocessing filters.
Decode Base64 StringTool to decode a Base64 string to a file.
Base64 EncodeTool to encode a string to Base64.
Calculate DateTool to calculate a date by adding or subtracting a time interval from a given date.
Check Array Contains ValueTool to check if a value exists within a JSON array.
Check Text Contains ValueTool to check if a text string contains a specific value with configurable comparison rules.
Clean StringTool to clean text by removing control characters, invalid filename characters, and custom character sets.
Clean Up Photo ImageTool to clean up photo images by removing artifacts, correcting orientation, and enhancing quality.
Combine ArraysTool to combine two JSON arrays by matching a key attribute.
Compare TextTool to compare two text strings and determine if they match.
Compare Word DocumentsTool to compare two Microsoft Word or PDF documents and generate a document with tracked changes.
Compress ImageTool to compress an image in JPG or PNG format.
Compress PDFTool to compress a PDF document by optimizing images, removing unused objects, and applying various compression techniques.
Concatenate TextTool to concatenate an array of text values with an optional delimiter.
Array to JSONTool to convert an array to a named JSON object.
Array to XMLTool to convert a JSON array to XML format.
Convert File to PDFTool to convert a file to PDF format.
Convert HTML to ImageTool to convert HTML content to an image.
Convert HTML to PDF (V2)Tool to convert HTML content or a URL to PDF format (V2).
Convert HTML to WordTool to convert HTML content to Word (DOCX) format.
Convert Image to GrayscaleTool to convert an image to grayscale.
Convert Image to PDFTool to convert an image file to PDF format with optional OCR.
Convert JSON to ExcelTool to convert JSON data to Excel format.
Convert JSON to XMLTool to convert JSON data to XML format.
Convert Time ZoneTool to convert a date and time value from one time zone to another using Encodian's time zone conversion API.
Convert XML to JSONTool to convert XML strings to JSON format.
Count Array ItemsTool to count the number of items in a JSON array or object.
Create QR CodeTool to generate a QR code barcode image with customizable size, colors, border, and encoding options.
Format Text CaseTool to format text with various case transformations (uppercase, lowercase, title case, etc.
Hash DataTool to compute a cryptographic hash (MD5, SHA256, etc.
Unzip FileExtracts all files from a ZIP archive and returns their base64-encoded contents.
Get Convert Excel SchemaTool to retrieve the dynamic schema for Excel conversion operations.
Get Convert Word SchemaTool to retrieve the dynamic JSON schema for Word document conversion operations.
Get Convert CAD SchemaTool to retrieve the dynamic schema for CAD file conversion operations.
Get Convert Image to PDF SchemaTool to retrieve the dynamic schema for Convert - Image to PDF operations.
Get Convert PowerPoint SchemaTool to retrieve the dynamic schema for PowerPoint conversion operations.
Get Convert Visio SchemaTool to retrieve the dynamic schema for Visio file conversion.
Get Create Barcode SchemaTool to retrieve the dynamic schema for creating a barcode.
Get Crop Image SchemaTool to retrieve the dynamic schema for the Crop Image action.
Get Dynamic Schema for HTTP RequestTool to retrieve the dynamic schema for the HTTP Request utility based on authentication type.
Get Word Insert Text SchemaTool to retrieve the dynamic schema for Word Insert Text operations.
Get File PropertiesTool to retrieve properties of a file.
Get Operation Status for AIRunPromptTextTool to get the operation status of an AIRunPromptText operation.
Get Operation Status for Encodian Send to FilerTool to get the operation status for an Encodian Send to Filer operation.
Get Operation Status Extract ImageTool to retrieve the operation status of a PDF ExtractImage operation.
Get Operation Status for ExtractTextRegionTool to retrieve the operation status of an ExtractTextRegion operation.
Get Operation Status File OnlyTool to retrieve operation status for file-only operations.
Get Operation Status for Image Extract TextTool to get the operation status of an ImageExtractText operation.
Get Operation Status for Multiple FilesTool to retrieve the operation status of a Word MultipleFiles operation.
Get Operation Status - PDF Split BarcodeTool to retrieve operation status for a PDF split barcode operation.
Get Operation Status for Split DocumentTool to retrieve the operation status of a PDF SplitDocument operation.
Get Sign PDF SchemaTool to retrieve the dynamic schema for PDF signing operations.
Get Subscription StatusTool to retrieve Encodian subscription status for Flowr and Vertr.
Resize ImageTool to resize an image by percentage or dimensions.
Move FileTool to move a file between containers.
Add PDF Header FooterTool to add HTML header and footer to a PDF.
Get PDF MetadataExtract comprehensive metadata and properties from PDF documents.
Watermark PDFTool to apply a text watermark to a PDF.
Read QR Code from DocumentTool to read QR codes from PDF or DOCX documents.
Word - Replace Text With ImageTool to replace text with an image in a Word document.
Validate Email AddressValidates an email address string against a custom regex pattern using Encodian's validation API.
Validate URL AvailabilityTool to validate the availability of a specified URL.
Write Range to ExcelTool to write values to a cell range in an Excel worksheet.

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:
  • A Google API key for Gemini models
  • A Composio account and API key
  • Python 3.9 or later installed
  • Basic familiarity with Python

Getting API Keys for Google and Composio

Google API Key
  • Go to Google AI Studio and create an API key.
  • Copy the key and keep it safe. You will put this in GOOGLE_API_KEY.
Composio API Key and User ID
  • Log in to the Composio dashboard.
  • Go to Settings → API Keys and copy your Composio API key. Use this for COMPOSIO_API_KEY.
  • Decide on a stable user identifier to scope sessions, often your email or a user ID. Use this for COMPOSIO_USER_ID.

Install dependencies

bash
pip install google-adk composio python-dotenv

Inside your virtual environment, install the required packages.

What's happening:

  • google-adk is Google's Agents Development Kit
  • composio connects your agent to Encodian via MCP
  • python-dotenv loads environment variables

Set up ADK project

bash
adk create my_agent

Set up a new Google ADK project.

What's happening:

  • This creates an agent folder with a root agent file and .env file

Set environment variables

bash
GOOGLE_API_KEY=your-google-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id-or-email

Save all your credentials in the .env file.

What's happening:

  • GOOGLE_API_KEY authenticates with Google's Gemini models
  • COMPOSIO_API_KEY authenticates with Composio
  • COMPOSIO_USER_ID identifies the user for session management

Import modules and validate environment

python
import os
import warnings

from composio import Composio
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()

warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")
What's happening:
  • os reads environment variables
  • Composio is the main Composio SDK client
  • GoogleProvider declares that you are using Google ADK as the agent runtime
  • Agent is the Google ADK LLM agent class
  • McpToolset lets the ADK agent call MCP tools over HTTP

Create Composio client and Tool Router session

python
composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["encodian"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")
What's happening:
  • Authenticates to Composio with your API key
  • Declares Google ADK as the provider
  • Spins up a short-lived MCP endpoint for your user and selected toolkit
  • Stores the MCP HTTP URL for the ADK MCP integration

Set up the McpToolset and create the Agent

python
composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Encodian operations."
    ),
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")
What's happening:
  • Connects the ADK agent to the Composio MCP endpoint through McpToolset
  • Uses Gemini as the model powering the agent
  • Lists exact tool names in instruction to reduce misnamed tool calls

Run the agent

bash
# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web

Execute the agent from the project root. The web command opens a web portal where you can chat with the agent.

What's happening:

  • adk run runs the agent in CLI mode
  • adk web . opens a web UI for interactive testing

Complete Code

Here's the complete code to get you started with Encodian and Google ADK:

python
import os
import warnings

from composio import Composio
from composio_google import GoogleProvider
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()
warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

composio_client = Composio(api_key=COMPOSIO_API_KEY, provider=GoogleProvider())

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["encodian"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url


composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Encodian operations."
    ),  
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

Conclusion

You've successfully integrated Encodian with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Encodian using natural language commands.

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Encodian tools
  • Environment variables keep your credentials secure and separate from code
  • Clear agent instructions reduce tool calling errors
  • The ADK web UI provides an interactive interface for testing and development

You can extend this setup by adding more toolkits to the toolkits array in your session configuration.

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FAQ

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

With a standalone Encodian MCP server, the agents and LLMs can only access a fixed set of Encodian tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Encodian and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Google ADK?

Yes, you can. Google ADK 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 Encodian tools.

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

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

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