FunctionTool fails to invoke callables with positional-only arguments

Finding: In google/adk-python, FunctionTool.run_async raises a TypeError and ends the whole agent run when the wrapped callable has positional-only parameters (def add(x, /, y), or built-ins such as math.pow). The reporter saw this on ADK 2.11.0 and on main at commit 539a0d07 (https://github.com/google/adk-python/issues/7382). A collaborator confirmed that add(x, /, y) and math.pow both fail on 2.11.0 and main, and said the behavior goes back to 1.19, so it is not a regression (https://github.com/google/adk-python/issues/7382#issuecomment-5996100124). Reported cause: the generated declaration schema lists positional-only parameters by name, but invocation forwards the model arguments with **args_to_call. Python rejects keyword passing for positional-only parameters. Reported errors: "got some positional-only arguments passed as keyword arguments" for Python functions, and "takes no keyword arguments" for math.pow (issue body). The same collaborator notes that generator tools on main go through FunctionNode, which also calls func(**kwargs), so def count(n, /): yield ... fails there too (comment 5996100124). Source-backed workaround, not verified by KFA: the collaborator suggested registering a thin wrapper that accepts keyword args and passes the positional-only ones positionally, for example def power(x: float, y: float): return math.pow(x, y). They said the tool schema stays the same, and asked the reporter to confirm it works on real tools. No confirmation appears in the thread. Fix status: PR #7383 is proposed. A collaborator ran an earlier revision locally and found add, math.pow and defaults working, with a missing positional-only argument falling back to the normal mandatory-parameters error (https://github.com/google/adk-python/issues/7382#issuecomment-6017186937). After the author rebased and added Runner tests for sync and async generator tools, the reviewer wrote that passing _compatible_func into FunctionNode is the right fix and that live streaming tools also get the wrapper. They left one non-blocking concern: the wrapper is built once in __init__, so reassigning tool.func afterward would still run the old function (https://github.com/google/adk-python/issues/7382#issuecomment-6044628392). The thread says the PR still needed maintainer review and workflow approval. It is not shown as merged, and no release containing it is cited. Limitations: this record is based on external reports in the issue thread. KFA did not reproduce the failure or test the wrapper or the PR. The comment timeline is a partial public HTML view and may omit middle comments. Treat the fix as unreleased until a merge commit or release is cited.