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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""``@function_tool`` examples loaded by the tests.
Includes both sync and async functions to exercise the dispatcher's
``asyncio.iscoroutinefunction`` branch.
"""
import asyncio
from verl.tools.function_tool import function_tool
@function_tool
def get_weather(city: str) -> dict:
"""Get the current weather for a city.
Args:
city: The city to look up, e.g. "Tokyo" or "San Francisco".
"""
# Stubbed lookup table; in production this would hit a weather API. The
# values are deliberately unusual so a test can distinguish a real tool
# response from a number the model guessed.
table = {
"tokyo": {"temperature_c": 17.3, "condition": "drizzle"},
"san francisco": {"temperature_c": 14.8, "condition": "fog"},
"new york": {"temperature_c": 21.6, "condition": "sunny"},
}
return table.get(city.lower(), {"temperature_c": -273.15, "condition": "unknown"})
@function_tool
def calculator(expression: str) -> str:
"""Evaluate an arithmetic expression and return the result.
Supports +, -, *, /, **, parentheses, and unary minus. Use this for any
numerical computation instead of doing mental arithmetic.
Args:
expression: A Python-style arithmetic expression, e.g. "(3+4)*5".
"""
import ast
import operator as op
ops = {ast.Add: op.add, ast.Sub: op.sub, ast.Mult: op.mul, ast.Div: op.truediv, ast.Pow: op.pow, ast.USub: op.neg}
def _eval(node):
if isinstance(node, ast.Constant) and isinstance(node.value, int | float): # noqa: UP038
return node.value
if isinstance(node, ast.BinOp):
return ops[type(node.op)](_eval(node.left), _eval(node.right))
if isinstance(node, ast.UnaryOp):
return ops[type(node.op)](_eval(node.operand))
raise ValueError(f"unsupported node: {ast.dump(node)}")
try:
return str(_eval(ast.parse(expression, mode="eval").body))
except Exception as e:
return f"ERROR: {e}"
@function_tool
async def fetch_url(url: str) -> str:
"""Fetch the contents of a URL (async).
This is a stubbed example that demonstrates ``async def`` tools; the
real implementation would use ``aiohttp`` or ``httpx``.
Args:
url: The URL to fetch.
"""
# Yield once so the tool actually behaves like an awaitable, then return
# a deterministic stub payload that tests can assert on.
await asyncio.sleep(0)
return f"<stub body for {url}>"
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