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Installation

Maven Central

implementation 'com.robbiebowman:claude-sdk:0.0.3'

About

This is a library for using Claude via the Anthropic API. It is built in Kotlin.

Usage

Send Message objects via the ClaudeClient.getChatCompletion method.

val messages = mutableListOf(Message(Role.User, "What's the surface temperature on Venus? No yapping."),)
val claudeResponse = claudeClient.getChatCompletion(messages) as ClaudeResponse.ChatResponse
println(claudeResponse.message) // "The average surface temperature on Venus is about 864°F (462°C)."

Reponses are usually ClaudeResponse.ChatResponse unless you define tools/functions. Then Claude may respond with a ClaudeResponse.ToolCall.

val claudeResponse = claudeClient.getChatCompletion(messages) as ClaudeResponse.ToolCall
if (claudeResponse.toolName == "getSurfaceTemp") {
    val planet = claudeResponse.arguments["planet"]
    val temp = myPlanetEncyclopedia.getPlanetSurfaceTemp(planet)
    messages.add(claudeResponse.toResult(temp))
    val newResponse = claudeClient.getChatCompletion(messages) as ClaudeResponse.ChatResponse
    println(newResponse.message) // "According to my encyclopedia, the temperature is 460°C."
}

You can define tools to the builder via withTool on ClaudeClientBuilder. It accepts either a Kotlin lambda reference or a ToolDescription object.

val claudeClient = ClaudeClientBuilder()
    .withApiKey(System.getenv("CLAUDE_KEY"))
    .withModel(ClaudeModel.Haiku)
    .withTool(::getSurfaceTemp)
    .build()