langgraph: add tool error handling

[vbarda]

No description provided.

[hinthornw]

Ya this is what I had in mind. I'd also be a fan of letting the user pass a callable in:

handle_tool_errors = Optional[Union[
bool,
Callable[[BaseException, ToolCall, Optional[BaseTool]], str]
]] = None

But perhaps yagni

[vbarda]

Ya this is what I had in mind. I'd also be a fan of letting the user pass a callable in:

handle_tool_errors = Optional[Union[
bool,
Callable[[BaseException, ToolCall, Optional[BaseTool]], str]
]] = None

But perhaps yagni

Is there a use case where this would be immediately useful for you? Otherwise I'd rather keep it simple for the time being, and add later if we need to