Claude Agent SDK for Java

A Java SDK for integrating with Claude Code CLI, enabling programmatic control of Claude as an AI coding agent.

This project has moved to markpollack/claude-agent-sdk-java. Current documentation is at lab.pollack.ai/projects/claude-agent-sdk. The content below may be outdated.

A Java SDK for integrating with Claude Code CLI, enabling programmatic control of Claude as an AI coding agent.

Overview

The Claude Agent SDK allows Java applications to:

• Execute queries and receive responses from Claude
• Maintain multi-turn conversation sessions
• Control tool permissions and safety settings
• Integrate with MCP (Model Context Protocol) servers
• Intercept and customize tool execution with hooks

Three-API Architecture

API	Class	Programming Style	Best For
One-shot	Query	Static methods	CLI tools, scripts, simple queries
Blocking	ClaudeSyncClient	Iterator-based	Traditional applications, synchronous workflows
Reactive	ClaudeAsyncClient	Flux/Mono	Non-blocking applications, high concurrency

Both ClaudeSyncClient and ClaudeAsyncClient support the full feature set: multi-turn conversations, hooks, MCP integration, and permission callbacks. They differ only in programming paradigm (blocking vs non-blocking).

Quick Start

Add the dependency to your project:

<dependency>
    <groupId>org.springaicommunity</groupId>
    <artifactId>claude-code-sdk</artifactId>
    <version>1.0.0-SNAPSHOT</version>
</dependency>

Simple Query

import org.springaicommunity.claude.agent.sdk.Query;

String answer = Query.text("What is 2 + 2?");
System.out.println(answer);  // "4"

Multi-Turn Conversation

Both clients support multi-turn conversations with full context preservation. Choose based on your programming paradigm preference:

Blocking

import org.springaicommunity.claude.agent.sdk.ClaudeClient;
import org.springaicommunity.claude.agent.sdk.ClaudeSyncClient;
import java.nio.file.Path;

try (ClaudeSyncClient client = ClaudeClient.sync()
        .workingDirectory(Path.of("."))
        .build()) {

    String response1 = client.connectText("My favorite color is blue.");
    System.out.println(response1);

    String response2 = client.queryText("What is my favorite color?");
    System.out.println(response2);  // "blue"

    String response3 = client.queryText("Spell it backwards.");
    System.out.println(response3);  // "eulb"
}

Reactive

import org.springaicommunity.claude.agent.sdk.ClaudeClient;
import org.springaicommunity.claude.agent.sdk.ClaudeAsyncClient;
import java.nio.file.Path;

ClaudeAsyncClient client = ClaudeClient.async()
    .workingDirectory(Path.of("."))
    .build();

// Multi-turn with elegant flatMap chaining
client.connect("My favorite color is blue.").text()
    .doOnSuccess(System.out::println)
    .flatMap(r1 -> client.query("What is my favorite color?").text())
    .doOnSuccess(System.out::println)  // "blue"
    .flatMap(r2 -> client.query("Spell it backwards.").text())
    .doOnSuccess(System.out::println)  // "eulb"
    .subscribe();  // Non-blocking

Documentation

API Reference

Complete API documentation for all classes, methods, and types

Tutorial

Step-by-step guide from basics to advanced patterns

Resources

• GitHub Repository - Source code and examples
• Claude Code Documentation - Official Claude Code docs