Anthropic SDK

@lookspan/anthropic wraps an Anthropic client so every messages.create call — including streaming — emits a Lookspan span. Same client type, identical behavior.

Install

npm install @lookspan/anthropic

Usage

import Anthropic from '@anthropic-ai/sdk';
import { observeAnthropic } from '@lookspan/anthropic';

const anthropic = observeAnthropic(new Anthropic());
await anthropic.messages.create({
  model: 'claude-sonnet-4-6',
  max_tokens: 1024,
  messages,
});

What gets traced

Method	Span type
messages.create	llm_call

Streaming is supported — the wrapper accumulates the streamed text into the span’s output and reads token usage from the response. Cost is computed server-side from the model name against Lookspan’s pricing table.

Options

observeAnthropic(client, options) accepts the shared option bag. For example:

const anthropic = observeAnthropic(new Anthropic(), {
  agentId: 'planner',
  sessionId: 'run-2026-06-08',
});

Content is omitted by default. Set { captureContent: true } only when prompts and replies are safe to persist and you want Replay & judge for those spans.