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1#!/usr/bin/env python32"""metadata.user_id + service_tier with the Python SDK; usage.service_tier tells which tier served the request.34STATUS: LIVE_VERIFIED 2026-09-18 with anthropic 1.7.0 (.venv). Run: .venv/bin/python examples/anthropic/messages/metadata.py5Key comes from .env (loaded by scripts/live.py); never printed.6"""7import sys8from pathlib import Path910sys.path.insert(0, str(Path(__file__).resolve().parents[3]))11from scripts import live # noqa: E402 (loads .env, gives log_request)12from anthropic import Anthropic # noqa: E4021314client = Anthropic()15MODEL = "claude-haiku-4-5-20251001"16msg = client.messages.create(model=MODEL, max_tokens=16, metadata={"user_id": "atlas-user-0001"}, service_tier="auto",17 messages=[{"role": "user", "content": "Reply with OK."}])18print(msg.content[0].text, "| service_tier:", msg.usage.service_tier)19live.log_request("anthropic", "POST", "/v1/messages", 200, 0.00004, "example metadata.py")20