ask/talk.ts

import Anthropic from "@anthropic-ai/sdk";

// A missing credential should be one clear line, not a stack trace.
if (!process.env.ANTHROPIC_API_KEY) {
  console.error("ANTHROPIC_API_KEY is not set. Export it and run this again.");
  process.exit(1);
}

const client = new Anthropic();

async function main(): Promise<void> {
  const response = await client.messages.create({
    model: "claude-opus-5-5",
    max_tokens: 1024,
    messages: [
      {
        role: "user",
        content:
          "In two sentences: how far from a fire hydrant may I park in Maryland?",
      },
    ],
  });

  for (const block of response.content) {
    if (block.type === "text") {
      console.log(block.text);
    }
  }

  console.log(
    `\n[in: ${response.usage.input_tokens} out: ${response.usage.output_tokens}]`,
  );
}

main().catch((error: unknown) => {
  console.error(error instanceof Error ? error.message : String(error));
  process.exit(1);
});