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import asyncio
from anthropic import AsyncAnthropic
client = AsyncAnthropic()
async def main() -> None:
async with client.messages.stream(
max_tokens=1024,
model="claude-sonnet-4-5-20250929",
tools=[
{
"name": "get_weather",
"description": "Get the weather at a specific location",
"input_schema": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "The city and state, e.g. San Francisco, CA"},
"unit": {
"type": "string",
"enum": ["celsius", "fahrenheit"],
"description": "Unit for the output",
},
},
"required": ["location"],
},
}
],
messages=[{"role": "user", "content": "What is the weather in SF?"}],
) as stream:
async for event in stream:
if event.type == "input_json":
print(f"delta: {repr(event.partial_json)}")
print(f"snapshot: {event.snapshot}")
print()
asyncio.run(main())
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