FunctionTool declares every functools.partial as `partial` and drops the `__call__` docstring

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Issue 类型
缺陷
描述清晰度
基本清楚
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技术栈
python
领域
ai, tooling

调研方向

Start in google.adk.tools.function_tool.FunctionTool and google.adk.models.llm_request.LlmRequest, using the reported Python 3.13 reproduction to trace tool naming and declaration descriptions. Done means both functools.partial tools retain distinct names and docstrings, and OrderLookup's call docstring appears in its declaration.

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描述

If you bind an API key into two tools with functools.partial, they're both declared as partial with the functools.partial docstring. Only the last one stays registered, so weather calls run get_forecast.

A callable object documented only on __call__ shows that docstring in tool.description, but its declaration doesn't have one.

Repro on main (f33d492), Python 3.13:

from functools import partial
from google.adk.models.llm_request import LlmRequest
from google.adk.tools.function_tool import FunctionTool

def get_weather(key: str, city: str):
  """Current weather for a city."""

def get_forecast(key: str, city: str):
  """Forecast for a city."""

class OrderLookup:
  def __call__(self, order_id: str):
    """Finds an order by id."""

req = LlmRequest()
req.append_tools([FunctionTool(partial(get_weather, "k")),
                  FunctionTool(partial(get_forecast, "k")),
                  FunctionTool(OrderLookup())])
for d in req.config.tools[0].function_declarations:
  print(d.name, repr(d.description))

It logs Duplicate tool name 'partial', prints partial twice, then OrderLookup None. I'd expect each tool under its own name and docstring.

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