What it does

@anthropic-ai/sdk is Anthropic’s first-party TypeScript client for the Claude API. Install it, instantiate with an API key, call client.messages.create(). The README is almost aggressively minimal—install, one code block, done.

The interesting bit

The SDK auto-reads ANTHROPIC_API_KEY from env by default, so the config object can literally be empty. That’s a small courtesy that saves a line in every serverless function. Also notable: it requires Node 18+, which means no polyfill baggage for modern fetch.

Key highlights

• First-party SDK from Anthropic (not community-maintained)
• TypeScript-native with server-side JS/TS support
• Auto-discovers ANTHROPIC_API_KEY environment variable
• Targets Claude’s Messages API (client.messages.create)
• MIT licensed

Caveats

• README is bare-bones; actual docs live on platform.claude.com
• No mention of streaming, retries, or error handling in the README
• Model name claude-opus-4-6 in the example looks like a placeholder or typo

Verdict

Use this if you want the official, maintained path to Claude from Node.js. Skip it if you need a client with bells and whistles already documented—though the SDK likely has them, you’ll need to dig into the external docs to find out.