SDKs (Python, TypeScript)

Anthropic's official Python and TypeScript SDKs are client libraries that wrap the Claude Messages API, making it easier to build applications without dealing with raw HTTP requests or manual response parsing. Each SDK provides idiomatic language interfaces, strong type safety, automatic retry logic with exponential backoff, and built-in streaming support via server-sent events. They handle authentication, request formatting, and error handling so developers can focus on application logic rather than infrastructure. The Python SDK is available as the `anthropic` package on PyPI and supports both synchronous and asynchronous (`AsyncAnthropic`) clients. The TypeScript SDK is available as `@anthropic-ai/sdk` on npm and is designed for Node.js and browser environments. Both SDKs expose the same core capabilities—text generation, tool use, streaming, vision, and extended thinking—with language-appropriate patterns. Beyond basic message generation, both SDKs include helpers for advanced workflows: streaming helpers that accumulate events into a final message object, tool execution loops, Model Context Protocol (MCP) integration, and beta feature access via a dedicated namespace. They are open-source and actively maintained on GitHub.