diff --git a/src/hooks/runtime-fallback/first-prompt-watchdog-progress-events.test.ts b/src/hooks/runtime-fallback/first-prompt-watchdog-progress-events.test.ts
new file mode 100644
index 000000000..732497137
--- /dev/null
+++ b/src/hooks/runtime-fallback/first-prompt-watchdog-progress-events.test.ts
@@ -0,0 +1,90 @@
+/// <reference path="../../../bun-test.d.ts" />
+
+import { describe, expect, it } from "bun:test"
+
+import { observeEventForWatchdog, type FirstPromptWatchdog } from "./first-prompt-watchdog"
+
+interface RecordedWatchdogCalls {
+  readonly user: string[]
+  readonly progress: string[]
+  readonly terminal: string[]
+}
+
+function createRecordingWatchdog(calls: RecordedWatchdogCalls): FirstPromptWatchdog {
+  return {
+    onUserMessage(sessionID) {
+      calls.user.push(sessionID)
+    },
+    onAssistantProgress(sessionID) {
+      calls.progress.push(sessionID)
+    },
+    onSessionTerminal(sessionID) {
+      calls.terminal.push(sessionID)
+    },
+    dispose() {},
+  }
+}
+
+function freshCalls(): RecordedWatchdogCalls {
+  return { user: [], progress: [], terminal: [] }
+}
+
+describe("observeEventForWatchdog progress markers", () => {
+  const sessionID = "session-observed-progress"
+
+  for (const [label, marker] of [
+    ["finished boolean", { finished: true }],
+    ["completed boolean", { completed: true }],
+    ["completed time", { time: { completed: 1779267000000 } }],
+  ] as const) {
+    it(`#given a message.updated assistant event with ${label} #when observed #then onAssistantProgress is called`, () => {
+      const calls = freshCalls()
+      observeEventForWatchdog(
+        {
+          type: "message.updated",
+          properties: { info: { sessionID, role: "assistant", ...marker } },
+        },
+        createRecordingWatchdog(calls),
+      )
+      expect(calls.progress).toEqual([sessionID])
+    })
+  }
+
+  it("#given a message.updated assistant event with false completion markers and no parts #when observed #then no progress is signalled", () => {
+    const calls = freshCalls()
+    observeEventForWatchdog(
+      {
+        type: "message.updated",
+        properties: {
+          info: {
+            sessionID,
+            role: "assistant",
+            completed: false,
+            finish: false,
+            finished: false,
+          },
+          parts: [],
+        },
+      },
+      createRecordingWatchdog(calls),
+    )
+    expect(calls.progress).toEqual([])
+  })
+
+  for (const [eventType] of [
+    ["session.next.text.delta"],
+    ["session.next.reasoning.delta"],
+    ["session.next.tool.called"],
+    ["session.next.tool.success"],
+    ["session.next.step.ended"],
+  ] as const) {
+    it(`#given a ${eventType} event with a sessionID #when observed #then onAssistantProgress is called`, () => {
+      const calls = freshCalls()
+      observeEventForWatchdog(
+        { type: eventType, properties: { sessionID } },
+        createRecordingWatchdog(calls),
+      )
+      expect(calls.progress).toEqual([sessionID])
+    })
+  }
+})
diff --git a/src/hooks/runtime-fallback/first-prompt-watchdog.ts b/src/hooks/runtime-fallback/first-prompt-watchdog.ts
index 7ee8f2265..72ff2230d 100644
--- a/src/hooks/runtime-fallback/first-prompt-watchdog.ts
+++ b/src/hooks/runtime-fallback/first-prompt-watchdog.ts
@@ -11,6 +11,7 @@ import { resolveFallbackBootstrapModel } from "./fallback-bootstrap-model"
 import { dispatchFallbackRetry } from "./fallback-retry-dispatcher"
 
 const SOURCE = "first-prompt-watchdog"
+const SESSION_NEXT_EVENT_PREFIX = "session.next."
 
 declare function setTimeout(callback: () => void | Promise<void>, delay?: number): RuntimeFallbackTimeout
 declare function clearTimeout(timeout: RuntimeFallbackTimeout): void
@@ -29,6 +30,19 @@ const TERMINAL_EVENT_TYPES = new Set([
   "session.error",
 ])
 
+function isCompletionMarker(value: unknown): boolean {
+  if (typeof value === "boolean") return value
+  return value !== undefined && value !== null
+}
+
+function hasAssistantCompletionMarker(info: Record<string, unknown>): boolean {
+  const time = isRecord(info.time) ? info.time : undefined
+  return isCompletionMarker(info.finish)
+    || isCompletionMarker(info.finished)
+    || isCompletionMarker(info.completed)
+    || isCompletionMarker(time?.completed)
+}
+
 /**
  * Translate an OpenCode session event into the appropriate watchdog signal.
  *
@@ -48,6 +62,12 @@ export function observeEventForWatchdog(
   const props = isRecord(event.properties) ? event.properties : undefined
   if (!props) return
 
+  if (event.type.startsWith(SESSION_NEXT_EVENT_PREFIX)) {
+    const sessionID = resolveSessionEventID(props) ?? resolveMessageEventSessionID(props)
+    if (sessionID) watchdog.onAssistantProgress(sessionID)
+    return
+  }
+
   if (event.type === "message.part.updated" || event.type === "message.part.delta") {
     const sessionID = resolveMessageEventSessionID(props)
     const part = isRecord(props.part) ? props.part : undefined
@@ -63,6 +83,7 @@ export function observeEventForWatchdog(
 
   if (event.type === "message.updated") {
     const info = isRecord(props.info) ? props.info : undefined
+    if (!info) return
     const sessionID = typeof info?.sessionID === "string" ? info.sessionID : undefined
     const role = typeof info?.role === "string" ? info.role : undefined
     if (!sessionID || !role) return
@@ -76,7 +97,7 @@ export function observeEventForWatchdog(
 
     if (role === "assistant") {
       const hasError = info?.error !== undefined
-      const hasFinish = info?.finish !== undefined
+      const hasFinish = hasAssistantCompletionMarker(info)
       const eventParts = Array.isArray(props.parts) ? props.parts : undefined
       const infoParts = Array.isArray(info?.parts) ? info.parts : undefined
       const parts = eventParts ?? infoParts ?? []