google_adk_decorator

Google ADK Decorator Example

This example shows how to use Agent Control's @control() decorator inside a Google ADK app.

Use this example if you want ADK as the host framework but prefer Agent Control's decorator model for tool protection.

What It Demonstrates

• @control() on ADK tool functions
• automatic step registration from decorated functions
• pre-tool blocking for restricted cities
• post-tool output filtering for synthetic unsafe output
• optional sdk-local execution without changing the agent code

Prerequisites

1. Start the Agent Control server from the repo root:

# From repo root
make server-run

2. Install the example dependencies:

# In separate shell
cd examples/google_adk_decorator
uv pip install -e . --upgrade

3. Set your Google API key:

export GOOGLE_API_KEY="your-key-here"

4. Optional environment variables:

export AGENT_CONTROL_URL=http://localhost:8000
export GOOGLE_MODEL=gemini-2.5-flash

Setup

Default server execution:

cd examples/google_adk_decorator
uv run python setup_controls.py

Optional sdk-local execution:

cd examples/google_adk_decorator
uv run python setup_controls.py --execution sdk

The example code does not change between modes. The only difference is where the controls run:

• server - evaluation happens on the Agent Control server
• sdk - evaluation happens locally in the Python SDK after the controls are fetched

The setup script creates namespaced controls for this example:

• adk-decorator-block-restricted-cities
• adk-decorator-block-internal-contact-output

Run

cd examples/google_adk_decorator
uv run adk run my_agent

Suggested Scenarios

Safe request:

What time is it in London?

Restricted city blocked before the tool call:

What is the weather in Pyongyang?

Synthetic unsafe tool output blocked after the tool call:

What time is it in Testville?

For more details on this example, see the Docs.

Tip: If you want the framework-native, attach-once ADK integration, use examples/google_adk_plugin/ instead.