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import json
from typing import Any, List
from typing_extensions import Literal
import rich
from anthropic import Anthropic, beta_tool
from anthropic.lib.tools import BetaFunctionTool, BetaFunctionToolResultType
from anthropic.types.beta import BetaToolReferenceBlockParam
client = Anthropic()
@beta_tool(defer_loading=True)
def get_weather(location: str, units: Literal["c", "f"]) -> str:
"""Lookup the weather for a given city in either celsius or fahrenheit
Args:
location: The city and state, e.g. San Francisco, CA
units: Unit for the output, either 'c' for celsius or 'f' for fahrenheit
Returns:
A dictionary containing the location, temperature, and weather condition.
"""
# Simulate a weather API call
print(f"Fetching weather for {location} in {units}")
# Here you would typically make an API call to a weather service
# For demonstration, we return a mock response
if units == "c":
return json.dumps(
{
"location": location,
"temperature": "20°C",
"condition": "Sunny",
}
)
else:
return json.dumps(
{
"location": location,
"temperature": "68°F",
"condition": "Sunny",
}
)
def make_tool_searcher(tools: List[BetaFunctionTool[Any]]) -> BetaFunctionTool[Any]:
"""Returns a tool that Claude can use to search through all available tools"""
@beta_tool
def search_available_tools(*, keyword: str) -> BetaFunctionToolResultType:
"""Search for useful tools using a query string"""
results: list[BetaToolReferenceBlockParam] = []
for tool in tools:
if keyword in json.dumps(tool.to_dict()):
results.append({"type": "tool_reference", "tool_name": tool.name})
return results
return search_available_tools
def main() -> None:
tools: list[BetaFunctionTool[Any]] = [
get_weather,
# ... many more tools
]
runner = client.beta.messages.tool_runner(
max_tokens=1024,
model="claude-sonnet-4-5-20250929",
tools=[*tools, make_tool_searcher(tools)],
messages=[{"role": "user", "content": "What is the weather in SF?"}],
betas=["tool-search-tool-2025-10-19"],
)
for message in runner:
rich.print(message)
main()
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