If the agent tool process details are not being displayed as expected in the Dify agent app, there are several potential reasons and solutions to consider:

1. Tool Identity Not Set: Ensure that the tool's identity is correctly set. If not, a ValueError might be raised, preventing the tool from being invoked ^[1].

2. Credential Issues: Verify that the tool provider credentials are correct. Any issues here could lead to a ToolProviderCredentialValidationError, which would stop the tool from functioning properly ^[1].

3. Tool Not Found or Unsupported: Check if the tool is correctly configured and supported. If the tool is not found or unsupported, it will not display the process details ^[1].

4. Parameter Validation: Ensure that the tool parameters are valid. Incorrect parameters can cause a ToolParameterValidationError, which would prevent the tool from executing ^[1].

5. Error Handling: Review the error handling mechanisms in place. The system can automatically retry operations or use predefined error handling strategies like default values or fail branches to manage errors without stopping the workflow ^[2][3].

6. Logging and Debugging: Enable debugging to get more insights. The DifyAgentCallbackHandler class provides logging for tool execution, which can help diagnose issues if dify_config.DEBUG is set to True ^[4].

By checking these areas, you should be able to identify and resolve the issue with the tool process detail display in the Dify agent app.

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I can't reproduce it on the newest main branch