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core[patch]: Fix FunctionCallbackHandler._on_tool_end (#22908)

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If the global `debug` flag is enabled, the agent will get the following
error in `FunctionCallbackHandler._on_tool_end` at runtime.

```
Error in ConsoleCallbackHandler.on_tool_end callback: AttributeError("'list' object has no attribute 'strip'")
```

By calling str() before strip(), the error was avoided.
This error can be seen at
[debugging.ipynb](https://github.com/langchain-ai/langchain/blob/master/docs/docs/how_to/debugging.ipynb).

- Issue: NA
- Dependencies: NA
- Twitter handle: https://x.com/kiarina37
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kiarina 2024-06-15 02:59:29 +09:00 committed by GitHub
parent b61de9728e
commit 8171efd07a
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2
libs/core/langchain_core/tracers/stdout.py
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@ -156,7 +156,7 @@ class FunctionCallbackHandler(BaseTracer):
+ get_bolded_text( + get_bolded_text(
f"[{crumbs}] [{elapsed(run)}] Exiting Tool run with output:\n" f"[{crumbs}] [{elapsed(run)}] Exiting Tool run with output:\n"
) )
+ f'"{run.outputs["output"].strip()}"' + f'"{str(run.outputs["output"]).strip()}"'
) )
def _on_tool_error(self, run: Run) -> None: def _on_tool_error(self, run: Run) -> None: