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google/adk-java

A code-first Java toolkit from Google for building, evaluating, and deploying AI agents, with a Python-ADK-style API.

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What is it?

ADK for Java is a toolkit for building AI agents in Java. Agent behavior, orchestration, and tool use are defined directly in code, which makes agents easier to test, version, and debug than configuration-driven approaches.

The API mirrors the Python ADK. An LlmAgent is configured with a name, description, model, instruction, and tools through a builder. Tools can be pre-built ones such as Google Search, custom Java functions, or tools generated from OpenAPI specs. Multiple specialized agents can be composed into hierarchies for multi-agent systems.

The project includes a built-in development UI for testing, debugging, and showcasing agents, and it supports agent-to-agent communication through the A2A protocol. Maven artifacts are published to Maven Central, and the project is licensed under Apache 2.0.

Key features

  • 01Define agent logic, tools, and orchestration directly in Java code.
  • 02Use built-in tools such as Google Search, custom functions, or OpenAPI-based tools.
  • 03Compose multiple specialized agents into hierarchical multi-agent systems.
  • 04Test, evaluate, and debug agents with a built-in development UI.
  • 05Communicate with remote agents through the A2A protocol.

Use cases

  • Building Java backend services that add LLM-driven agents with tool calling.
  • Creating agents that search the web or call internal APIs described by OpenAPI specs.
  • Prototyping and debugging multi-agent workflows in a local development UI.
  • Deploying agents to Google Cloud from a Java codebase.

Quick start

  1. 1

    Add the google-adk Maven dependency to your project

  2. 2

    Optionally add the google-adk-dev dependency for the Dev UI

Things to know

  • Some features are pre-GA and may have limited support.
  • Evaluation support is listed as coming soon in the README.
  • The default examples use Gemini models and Google Search, which suggests a Google Cloud-oriented setup.

Topics

#agent#llm#java#multi-agent#genai#a2a#agentic#agentic-ai#agentic-workflow#agents

FAQ

What is adk-java?
A code-first Java toolkit from Google for building, evaluating, and deploying AI agents, with a Python-ADK-style API. ADK for Java is a toolkit for building AI agents in Java. Agent behavior, orchestration, and tool use are defined directly in code, which makes agents easier to test, version, and debug than configuration-driven approaches.
Is adk-java free to use? What license does it have?
adk-java is open source under the Apache-2.0 license. Check the license terms before using it in commercial products.
Is adk-java still maintained?
Actively maintained. The last commit to adk-java was on Oct 21, 2026.
What can I use adk-java for?
Building Java backend services that add LLM-driven agents with tool calling. Creating agents that search the web or call internal APIs described by OpenAPI specs. Prototyping and debugging multi-agent workflows in a local development UI. Deploying agents to Google Cloud from a Java codebase.
How do I install adk-java?
Add the google-adk Maven dependency to your project Optionally add the google-adk-dev dependency for the Dev UI
Where can I get adk-java?
The source code and installation instructions are on GitHub: https://github.com/google/adk-java

Summary generated by AI from the project's README. GitHub stats refresh daily.

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