// STATUS: UNVERIFIED — no cloud credentials in this atlas; snippet follows official docs verbatim-ish
// Source: https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai (retrieved 2026-09-18)
// Install: npm install @anthropic-ai/vertex-sdk
// Auth: goes through the standard google-auth-library ADC flow. Env: ANTHROPIC_VERTEX_PROJECT_ID, CLOUD_ML_REGION.
import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";

const client = new AnthropicVertex({
  projectId: process.env.ANTHROPIC_VERTEX_PROJECT_ID,
  region: process.env.CLOUD_ML_REGION ?? "global",
});

const message = await client.messages.create({
  model: "claude-haiku-4-5@20251001", // cheapest Haiku 4.5 id on Google Cloud
  max_tokens: 8,
  messages: [{ role: "user", content: "Reply with OK." }],
});

const textBlock = message.content.find((block) => block.type === "text");
if (textBlock && textBlock.type === "text") console.log(textBlock.text);