A Java version of our open-source, code-first Python toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
Agent Development Kit (ADK) is designed for developers seeking fine-grained control and flexibility when building advanced AI agents that are tightly integrated with services in Google Cloud. It allows you to define agent behavior, orchestration, and tool use directly in code, enabling robust debugging, versioning, and deployment anywhere – from your laptop to the cloud.
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Rich Tool Ecosystem: Utilize pre-built tools, custom functions, OpenAPI specs, or integrate existing tools to give agents diverse capabilities, all for tight integration with the Google ecosystem.
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Code-First Development: Define agent logic, tools, and orchestration directly in Python for ultimate flexibility, testability, and versioning.
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Modular Multi-Agent Systems: Design scalable applications by composing multiple specialized agents into flexible hierarchies.
If you're using Maven, add the following to your dependencies:
<dependencies>
<dependency>
<groupId>com.google.adk</groupId>
<artifactId>google-adk</artifactId>
<version>0.1.0</version>
</dependency>
</dependencies>We're working on the Java version of the ADK docs, but you can but in the meantime you can familiarize yourself with the concepts and workflows for building, evaluating, and deploying agents by following the python documentation:
package com.google.adk;
import com.google.common.collect.ImmutableList;
import com.google.common.flogger.GoogleLogger;
import com.google.adk.agents.Agent;
import com.google.adk.tools.Annotations.Schema;
import com.google.adk.tools.FunctionTool;
public final class TestAgent {
private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
@Schema(
description =
"This function returns the current weather temperature for the specified location.")
public static int getWeather(
@Schema(name = "location", description = "The location for which the weather is requested")
String location) {
return 25;
}
static final Agent rootAgent;
// Static initializer block to handle exceptions
static {
FunctionTool weatherFunctionTool = FunctionTool.create(TestAgent.class, "getWeather");
// Create the Agent
rootAgent =
Agent.builder()
.name("root-agent")
.description("A helpful AI assistant.")
.model("gemini-2.0-flash-001")
.instruction("Be polite and answer all users' questions.")
.tools(ImmutableList.of(weatherFunctionTool))
.beforeModelCallback(
(invocationContext, llmRequest) -> {
logger.atInfo().log(
"==== Agent %s calling LLM with request: %s",
invocationContext.agent().name(), llmRequest);
return null;
})
.afterModelCallback(
(invocationContext, llmResponse) -> {
logger.atInfo().log(
"==== Agent %s got response from LLM: %s",
invocationContext.agent().name(), llmResponse);
return null;
})
.beforeAgentCallback(
(invocationContext) -> {
logger.atInfo().log("==== Agent %s starting", invocationContext.agent().name());
return null;
})
.beforeToolCallback(
(invocationContext, tool, args, toolContext) -> {
logger.atInfo().log(
"==== Agent %s calling tool %s, args: %s",
invocationContext.agent().name(), tool.name(), args);
return null;
})
.afterToolCallback(
(invocationContext, tool, args, toolContext, response) -> {
logger.atInfo().log(
"==== Agent %s finished calling tool %s, response: %s",
invocationContext.agent().name(), tool.name(), response);
return null;
})
.build();
}
private TestAgent() {}
}TODO(b/410930446): Add development UI
TODO(b/410912902): Port/reuse Python ADK eval stack
We welcome contributions from the community! Whether it's bug reports, feature requests, documentation improvements, or code contributions, please see our Contributing Guidelines to get started.
This project is licensed under the Apache 2.0 License - see the LICENSE file for details.
This feature is subject to the "Pre-GA Offerings Terms" in the General Service Terms section of the Service Specific Terms. Pre-GA features are available "as is" and might have limited support. For more information, see the launch stage descriptions.
Happy Agent Building!