ag_ui_adk 0.4.1

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ADK Middleware for AG-UI Protocol

This Python middleware enables Google ADK agents to be used with the AG-UI Protocol, providing a bridge between the two frameworks.

Prerequisites

The examples use ADK Agents using various Gemini models along with the AG-UI Dojo.

• A Gemini API Key. The examples assume that this is exported via the GOOGLE_API_KEY environment variable.

Quick Start

To use this integration you need to:

1. Clone the AG-UI repository.

   git clone https://github.com/ag-ui-protocol/ag-ui.git
   

2. Change to the integrations/adk-middleware/python directory.

   cd integrations/adk-middleware/python
   

3. Install the adk-middleware package from the local directory. For example,

   pip install .
   

   or

   uv pip install .
   

   This installs the package from the current directory which contains:

   • src/ag_ui_adk/ - The middleware source code
   • examples/ - Example servers and agents
   • tests/ - Test suite

4. Install the requirements for the examples, for example:

   uv pip install -r requirements.txt
   

5. Run the example fast_api server.

   export GOOGLE_API_KEY=<My API Key>
   cd examples
   uv sync
   uv run dev
   

6. Open another terminal in the root directory of the ag-ui repository clone.

7. Start the integration ag-ui dojo:

   pnpm install && pnpm run dev
   

8. Visit http://localhost:3000/adk-middleware.

9. Select View ADK Middleware from the sidebar.

Development Setup

If you want to contribute to ADK Middleware development, you'll need to take some additional steps. You can either use the following script of the manual development setup.

# From the adk-middleware directory
chmod +x setup_dev.sh
./setup_dev.sh

Manual Development Setup

# Create virtual environment
python -m venv venv
source venv/bin/activate

# Install this package in editable mode
pip install -e .

# For development (includes testing and linting tools)
pip install -e ".[dev]"
# OR
pip install -r requirements-dev.txt

This installs the ADK middleware in editable mode for development.

Testing

# Run tests (271 comprehensive tests)
pytest

# With coverage
pytest --cov=src/ag_ui_adk

# Specific test file
pytest tests/test_adk_agent.py

Usage options

Option 1: Direct Usage

from ag_ui_adk import ADKAgent
from google.adk.agents import Agent

# 1. Create your ADK agent
my_agent = Agent(
    name="assistant",
    instruction="You are a helpful assistant."
)

# 2. Create the middleware with direct agent embedding
agent = ADKAgent(
    adk_agent=my_agent,
    app_name="my_app",
    user_id="user123"
)

# 3. Use directly with AG-UI RunAgentInput
async for event in agent.run(input_data):
    print(f"Event: {event.type}")

Option 2: FastAPI Server

from fastapi import FastAPI
from ag_ui_adk import ADKAgent, add_adk_fastapi_endpoint
from google.adk.agents import Agent

# 1. Create your ADK agent
my_agent = Agent(
    name="assistant",
    instruction="You are a helpful assistant."
)

# 2. Create the middleware with direct agent embedding
agent = ADKAgent(
    adk_agent=my_agent,
    app_name="my_app",
    user_id="user123"
)

# 3. Create FastAPI app
app = FastAPI()
add_adk_fastapi_endpoint(
    app, agent, path="/chat",
    extract_headers=["x-user-id", "x-tenant-id"]  # Extract HTTP headers into state.headers
)

# Run with: uvicorn your_module:app --host 0.0.0.0 --port 8000

For detailed configuration options, see CONFIGURATION.md

Running the ADK Backend Server for Dojo App

To run the ADK backend server that works with the Dojo app, use the following command:

python -m examples.fastapi_server

This will start a FastAPI server that connects your ADK middleware to the Dojo application.

Examples

Simple Conversation

import asyncio
from ag_ui_adk import ADKAgent
from google.adk.agents import Agent
from ag_ui.core import RunAgentInput, UserMessage

async def main():
    # Setup
    my_agent = Agent(name="assistant", instruction="You are a helpful assistant.")

    agent = ADKAgent(
        adk_agent=my_agent,
        app_name="demo_app",
        user_id="demo"
    )

    # Create input
    input = RunAgentInput(
        thread_id="thread_001",
        run_id="run_001",
        messages=[
            UserMessage(id="1", role="user", content="Hello!")
        ],
        context=[],
        state={},
        tools=[],
        forwarded_props={}
    )

    # Run and handle events
    async for event in agent.run(input):
        print(f"Event: {event.type}")
        if hasattr(event, 'delta'):
            print(f"Content: {event.delta}")

asyncio.run(main())

Multi-Agent Setup

# Create multiple agent instances with different ADK agents
general_agent_wrapper = ADKAgent(
    adk_agent=general_agent,
    app_name="demo_app",
    user_id="demo"
)

technical_agent_wrapper = ADKAgent(
    adk_agent=technical_agent,
    app_name="demo_app",
    user_id="demo"
)

creative_agent_wrapper = ADKAgent(
    adk_agent=creative_agent,
    app_name="demo_app",
    user_id="demo"
)

# Use different endpoints for each agent
from fastapi import FastAPI
from ag_ui_adk import add_adk_fastapi_endpoint

app = FastAPI()
add_adk_fastapi_endpoint(app, general_agent_wrapper, path="/agents/general")
add_adk_fastapi_endpoint(app, technical_agent_wrapper, path="/agents/technical")
add_adk_fastapi_endpoint(app, creative_agent_wrapper, path="/agents/creative")

Tool Support

The middleware provides complete bidirectional tool support, enabling AG-UI Protocol tools to execute within Google ADK agents. All tools supplied by the client are currently implemented as long-running tools that emit events to the client for execution and can be combined with backend tools provided by the agent to create a hybrid combined toolset.

For detailed information about tool support, see TOOLS.md.

Additional Documentation

• CONFIGURATION.md - Complete configuration guide
• TOOLS.md - Tool support documentation
• USAGE.md - Usage examples and patterns
• ARCHITECTURE.md - Technical architecture and design details