Use the client only with a custom server

[ilbertt]

Is it possible to use the @tanstack/ai-client just as the state manager and fetcher for the chat? My server doesn't follow the Tanstack AI's stream protocol, so I'd like to "inject" messages from a normal REST endpoint into the state of the ChatClient.

I understand that a custom adapter could work, but it looks like it requires some plumbing work that my not be optimal.

In my specific use case, I'd like to fetch the messages from a server that exposes them with the A2A protocol (https://github.com/a2aproject/A2A). Is it possible? If not, why?

I'm mirroring here the discussion from https://discord.com/channels/719702312431386674/1458746966388379690 with the hope to get more visibility.