Installation - kenpachi

Requirements

Node.js 18+
TypeScript 5+ (recommended)

Install

kenpachi uses Zod for tool schemas — install both:

npm install kenpachi zod

pnpm add kenpachi zod

yarn add kenpachi zod

API keys

Set environment variables for the provider you use:

# Anthropic (Claude)
export ANTHROPIC_API_KEY="sk-ant-..."

# OpenAI (GPT)
export OPENAI_API_KEY="sk-proj-..."

In Node, load them with process.env.ANTHROPIC_API_KEY — or use a .env file with your preferred loader (dotenv, etc.).

Verify the install

import { Agent, createAnthropicProvider } from "kenpachi";

const provider = createAnthropicProvider({
  apiKey: process.env.ANTHROPIC_API_KEY!,
  model: "claude-sonnet-4-6",
});
const agent = new Agent(provider, []);

const result = await agent.run("Say hello in one sentence.");
console.log(result.text);

If that prints a response, you’re ready for the Quickstart.

⌘I