ToolCallResultSummaryMessage message type in AgentChat

[ekzhu]

Thanks, I understand the intent, the challenge for me is that both tool call results and normal responses are now returned as :class:~autogen_agentchat.messages.TextMessage with no differentiating characteristics, making it difficult to determine the difference between a textmessage from the agent and the additional tool call response (or summary) from the tool without tracking additional state (e.g. did I just receive a toolcallresult prior to this message, if so, then the next TextMessage is the tool response, not from the LLM).

I think It would be better to not mix the types. There is already toolcallresultmessage which was was previously the unambiguous way to identify tool results; now tool results are coming in two forms (toolcallresultmessage and another copy in a different format as textmessage) and it is now requires extra logic to try and determine if the textmessage is the tool results or from the LLM.

Can we create a clear message types for the new messages (e.g. toolcallresultsummarymessage) or some other disambiguating way in the message the determine the type of message?

Originally posted by @jspv in #4602 (comment)

[ekzhu]

@jspv let me know if you are interested in submitting a PR for this issue. It comes down to adding a new message type, and propagate the handling of this to make sure it is not skipped. You can find places TextMessage and other ChatMessage types are referenced.

[jspv]

done!