fix(background-agent): forward session stream activity

src/hooks/background-notification/hook.test.ts

@@ -35,6 +35,23 @@ describe("createBackgroundNotificationHook", () => {
     expect(handleEvent).toHaveBeenCalledWith(event)
   })
 
+  test("#given session.next stream event #when event handler runs #then it forwards to manager", async () => {
+    //#given
+    const handleEvent = mock(() => {})
+    const hook = createBackgroundNotificationHook({
+      handleEvent,
+      injectPendingNotificationsIntoChatMessage: () => {},
+    } as never)
+
+    const event = { type: "session.next.text.delta", properties: { sessionID: "ses-1", delta: "x" } }
+
+    //#when
+    await hook.event({ event })
+
+    //#then
+    expect(handleEvent).toHaveBeenCalledWith(event)
+  })
+
   test("#given todo.updated event #when event handler runs #then it forwards to manager", async () => {
     //#given
     const handleEvent = mock(() => {})

src/hooks/background-notification/hook.ts

@@ -28,9 +28,16 @@ const FORWARDED_EVENT_TYPES = new Set([
   "session.status",
 ])
 
+const FORWARDED_EVENT_PREFIXES = ["session.next."]
+
+function shouldForwardEvent(type: string): boolean {
+  return FORWARDED_EVENT_TYPES.has(type)
+    || FORWARDED_EVENT_PREFIXES.some((prefix) => type.startsWith(prefix))
+}
+
 export function createBackgroundNotificationHook(manager: BackgroundManager) {
   const eventHandler = async ({ event }: EventInput) => {
-    if (!FORWARDED_EVENT_TYPES.has(event.type)) return
+    if (!shouldForwardEvent(event.type)) return
     manager.handleEvent(event)
   }