Anthropic TypeScript SDK

The official library for integrating Claude into Node.js and browser-based applications with full type safety.

This SDK provides a streamlined interface for Anthropic’s Messages API, enabling developers to prompt Claude 3.5 Sonnet or Opus with minimal boilerplate. It handles asynchronous streaming, automatic retries on 5xx errors, and precise TypeScript definitions for all request parameters and response schemas. By utilizing the built-in Anthropic client, engineers can implement complex tool use (function calling) and vision capabilities while maintaining strict type compliance across the entire development stack.

https://github.com/anthropics/anthropic-sdk-typescript