feat: Adding OnModelErrorCallback #750
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This Changelist (CL) introduces new error handling mechanisms for LLM model calls and tool invocations within the Agent Development Kit. Specifically, it adds: * **`OnModelErrorCallback`**: An interface for handling errors that occur during an LLM model call. * **`OnToolErrorCallback`**: An interface for handling errors during a tool invocation. These callbacks allow for asynchronous or synchronous handling of errors, providing an opportunity to override the error with a custom response or result. The `LlmAgent` class is updated to support these new callbacks, and they are integrated into `BaseLlmFlow` and `Functions` to be triggered upon model or tool failures, respectively. Plugin-defined error callbacks are given precedence over agent-defined ones. Additionally, the CL introduces `canonical` methods (`canonicalBeforeAgentCallbacks`, `canonicalAfterAgentCallbacks`, etc.) to `BaseAgent` and `LlmAgent` to simplify accessing callback lists, and updates Javadoc for existing callback interfaces. New tests are included to verify the functionality and precedence of the error callbacks. PiperOrigin-RevId: 858648691
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feat: Adding OnModelErrorCallback
This Changelist (CL) introduces new error handling mechanisms for LLM model calls and tool invocations within the Agent Development Kit.
Specifically, it adds:
OnModelErrorCallback: An interface for handling errors that occur during an LLM model call.OnToolErrorCallback: An interface for handling errors during a tool invocation.These callbacks allow for asynchronous or synchronous handling of errors, providing an opportunity to override the error with a custom response or result. The
LlmAgentclass is updated to support these new callbacks, and they are integrated intoBaseLlmFlowandFunctionsto be triggered upon model or tool failures, respectively. Plugin-defined error callbacks are given precedence over agent-defined ones.Additionally, the CL introduces
canonicalmethods (canonicalBeforeAgentCallbacks,canonicalAfterAgentCallbacks, etc.) toBaseAgentandLlmAgentto simplify accessing callback lists, and updates Javadoc for existing callback interfaces. New tests are included to verify the functionality and precedence of the error callbacks.