Generic error for Stop Reasons in prompt turn?

[axel7083]

Let's say your key has expired, when should the user see the error?

Looking at the https://agentclientprotocol.com/protocol/v1/prompt-turn#stop-reasons you don't have a generic error that the server can send.

For example in opencode (terminal), trying to talk to the model will give you something like

But through their ACP implementation, you will only receive a stopReason: "end_turn", so my question is what is the recommended pattern, and are we missing a generic "error" in the stopReason?

[anvilpete]

Setting the result field in a response indicates that the request was successful. I think the usual answer would be to respond to the request with an error instead.

For example, I've seen agents respond to a prompt request with something like:

{"jsonrpc": "2.0", "error": {"code": -32603, "message": "Internal error", "data": {"message": "Expired key"}}, "id": 3}

[axel7083]

Thanks, will see if Opencode is interested to implement this feature