core: make sure tool input keys won't be modified during following process

[JetDrag]

• Description: When the tool has an empty args_schema field, it throws a TypeError('Object of type CallbackManagerForToolRun is not JSON serializable') error during execution. This error occurs because tool_input is not copied in this case, leading to unintended modifications to its keys, unlike scenarios where the args_schema field is populated. This fix ensures that tool_input remains unchanged throughout the process, resolving the issue.

• Issue: Fixes TypeError('Object of type CallbackManagerForToolRun is not JSON serializable') on Coder agent #24621, Agent Executor using some specific search tools is causing an error #24614

• Dependencies: None

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Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Nov 3, 2024 3:05am

[JetDrag]

Hi @baskaryan , do you have any time to review this core fix PR? The impact scope is somewhat large.

[JetDrag]

Hi @efriis , do you have any time to review this core fix PR? The impact scope is somewhat large.

[rubepocegeka]

When will this be merged with mastser, it is a crucial fix for the Langgraph environment.

[JetDrag]

Hi @efriis, do you have time to review this core fix PR as soon as possible? The impact scope is somewhat large.

[ccurme]

Could you please add a minimal reproducible example of the problem as a test?

I cannot replicate the problem in the example commented in one of the issues (here, from July).

[ccurme]

Thanks very much for the root-causing and comments here. Closing in favor of #28824. Please add your feedback there.