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Tao Chen
94a78d15e2
### Motivation and Context <!-- Thank you for your contribution to the semantic-kernel repo! Please help reviewers and future users, providing the following information: 1. Why is this change required? 2. What problem does it solve? 3. What scenario does it contribute to? 4. If it fixes an open issue, please link to the issue here. --> Currently, our agents' `invoke` and `invoke_stream` have inconsistent behavior where the responses may contain different contents. For example, the chat completion agent (`invoke`) may return all content types generated by the agent including function call/result contents that are meant to be internal only, while the assistant agent doesn't return those contents. This creates confusion both for users and developers of SK of what an agent should return when working with agents. ### Description <!-- Describe your changes, the overall approach, the underlying design. These notes will help understanding how your code works. Thanks! --> This PR standardizes the behavior of agents by adding an `on_intermediate_message ` parameter to the `invoke` and `invoke_stream` methods in the `Agent` abstraction. This parameter accepts a callback function that will be called whenever a new message is generated by the agent, except the last one that gets returned to the caller. This allows the caller to inspect what the agent did after a response is returned. In addition, this PR also converges on the behavior of the `invoke` and `invoke_stream` methods (respectively) to return the same content types from all agents, making it easier for users to work with agents ### Contribution Checklist <!-- Before submitting this PR, please make sure: --> - [x] The code builds clean without any errors or warnings - [x] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [x] All unit tests pass, and I have added new tests where possible - [ ] I didn't break anyone 😄