.Net: New Feature: Provide additional messages when invoking the agent run.

[sandrohanea]

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name: Provide additional messages when invoking the agent run.
about: Suggest an idea for this project

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Similar with #8715
OpenAIAssistantInvocationOptions is not exposing all the properties available in RunCreationOptions

The missing property includes:

• AdditionalMessages

• ToolOverrides

Without this option, we are forced to execute multiple calls to the API (to add the user message + separate to create the assistant run when we can do it with a single call).

[crickman]

Hi @sandrohanea - Thank you for the input / suggestions.

For ToolOverrides, this may be accomplished for code-interpreter or file-search via the either:

• OpenAIAssistantInvocationOptions.EnableCodeInterpreter https://github.com/microsoft/semantic-kernel/blob/main/dotnet/src/Agents/OpenAI/OpenAIAssistantInvocationOptions.cs#L31
  or
• OpenAIAssistantInvocationOptions.EnableFileSearch https://github.com/microsoft/semantic-kernel/blob/main/dotnet/src/Agents/OpenAI/OpenAIAssistantInvocationOptions.cs#L37

For function overrides, the agent always advertises the available functions based on its associated Kernel: OpenAIAssistantAgent.Kernel - https://github.com/microsoft/semantic-kernel/blob/main/dotnet/src/Agents/Abstractions/KernelAgent.cs#L37

The collection of available plugins may be directly managed on the Kernel itself at any point:

agent.Kernel.Plugins.Add(...);
agent.Kernel.Plugins.Remove(...);

We currently support AdditionalMessages when creating a thread: https://github.com/microsoft/semantic-kernel/blob/main/dotnet/src/Agents/OpenAI/OpenAIThreadCreationOptions.cs

I can certainly add it to the OpenAIAssistantInvocationOptions also.