ACP: CodeCompanionChatACPModeChanged not emitted when manually changing modes

[betaboon]

Hello there,

I want to integrate the agent mode into my lualine, so i tried to consume CodeCompanionChatACPModeChanged.

I noticed this event is never emitted when manually changing the agent mode via /mode.

looking into the codebase of codecompanion i noticed that CodeCompanionChatACPModeChanged is only emitted when a session/update with current_mode_update has been received from the agent.

I'm using opencode which does not seem to send a session/update.

now I'm wondering who's at fault:

1. me: because CodeCompanionChatACPModeChanged doesnt mean what i thought
2. opencode: because agents should send that notification even when instructed to change mode by the client
3. codecompanion: because it assumes the agent will send that notification

The ACP Spec seems to indicate that an agent is not expected to send the notification when instructed by the client.

Thanks in advance for any input