@anthropic-ai/claude-agent-sdk

A TypeScript toolkit for building stateful, tool-using AI agents powered by Claude 3.5 Sonnet.

This SDK provides the core primitives needed to transition from basic prompting to autonomous agentic workflows. It handles the heavy lifting of state management, tool execution, and multi-turn conversation loops using Claude (specifically optimized for the 3.5 Sonnet model). Developers get built-in support for complex task orchestration: the library manages the cycle of receiving user input, selecting the appropriate tool from a provided schema, and processing the resulting data until the objective is met. It is the standard implementation for engineers building reliable, production-grade agents on the Anthropic platform.

https://www.npmjs.com/package/@anthropic-ai/claude-agent-sdk