.NET: AG-UI - passing extra data from the client to the server

[Dazfl]

I'm writing this to see if anyone else has had any success doing this.

I have a chat application using AG-UI. I have added the functionality to attach a document to a chat session (where it is parsed and vectorised), and I can query it successfully. However, I would like the ability to pass the file names (and ids) from the client to the server without including it in the chat message. This is so that when I execute my document search tool, I would like to be able to filter the search on filename (or id) ... so I'm not accidently querying the entire list of attached files (files are persisted for historical purposes).

I've tried using 'AdditionalProperties' on TextContent but it seems this feature is not implemented yet because I cannot see them populated on the server side. I've also tried getting the ConversationId from the Chat Session (via CreateSessionAsync()), but again the session details do not appear on the server side.

So, I'm wondering if anyone has successfully passed extra data from the client to the server, via AG-UI, without including it in the message itself?

[ecc-parity-check]

Yes, same for me.
The AdditionalProperties on the server side are always null, both for AIContent elements and AgentRunOptions :|
Checked in Middleware attached to an agent.
And AgentSession looks like this:

[ecc-parity-check]

As a workaround I would wrap the prompt into a Json with required parameters, and in the agent's middleware I would deserialized the Json, use parameters as needed, replaced "TextContent with Json" with "TextContent with prompt" and run the agent with this modified set of messages.

[Dazfl]

I ended up doing something similar to what you suggested. I added the file information as JSON payload to the TextContent and parsed it accordingly. Works for now, but it would be ideal to be able to use 'AdditionalProperties' in the ChatMessage.

Thanks for your help @ecc-parity-check