fix(todo-continuation-enforcer): gate stagnation on successful injections

Keep failed or skipped injections on the MAX_CONSECUTIVE_FAILURES path so unchanged todos do not trip stagnation first.

src/hooks/todo-continuation-enforcer/continuation-injection.ts

@@ -164,6 +164,7 @@ ${todoList}`
     if (injectionState) {
       injectionState.inFlight = false
       injectionState.lastInjectedAt = Date.now()
+      injectionState.awaitingPostInjectionProgressCheck = true
       injectionState.consecutiveFailures = 0
     }
   } catch (error) {

src/hooks/todo-continuation-enforcer/session-state.test.ts

@@ -19,6 +19,24 @@ describe("createSessionStateStore", () => {
     // given
     const sessionID = "ses-stagnation"
     const state = sessionStateStore.getState(sessionID)
+
+    // when
+    const firstUpdate = sessionStateStore.trackContinuationProgress(sessionID, 2)
+    state.awaitingPostInjectionProgressCheck = true
+    const secondUpdate = sessionStateStore.trackContinuationProgress(sessionID, 2)
+    state.awaitingPostInjectionProgressCheck = true
+    const thirdUpdate = sessionStateStore.trackContinuationProgress(sessionID, 2)
+
+    // then
+    expect(firstUpdate.stagnationCount).toBe(0)
+    expect(secondUpdate.stagnationCount).toBe(1)
+    expect(thirdUpdate.stagnationCount).toBe(2)
+  })
+
+  test("given injection did not succeed, repeated incomplete counts do not track stagnation", () => {
+    // given
+    const sessionID = "ses-failed-injection"
+    const state = sessionStateStore.getState(sessionID)
     state.lastInjectedAt = Date.now()
 
     // when
@@ -28,8 +46,8 @@ describe("createSessionStateStore", () => {
 
     // then
     expect(firstUpdate.stagnationCount).toBe(0)
-    expect(secondUpdate.stagnationCount).toBe(1)
+    expect(secondUpdate.stagnationCount).toBe(0)
-    expect(thirdUpdate.stagnationCount).toBe(2)
+    expect(thirdUpdate.stagnationCount).toBe(0)
   })
 
   test("given incomplete count decreases, resets stagnation tracking", () => {
@@ -112,10 +130,13 @@ describe("createSessionStateStore", () => {
       { id: "2", content: "Task 2", status: "pending", priority: "medium" },
     ]
     sessionStateStore.trackContinuationProgress(sessionID, 2, initialTodos)
+    state.awaitingPostInjectionProgressCheck = true
     sessionStateStore.trackContinuationProgress(sessionID, 2, initialTodos)
+    state.awaitingPostInjectionProgressCheck = true
     sessionStateStore.trackContinuationProgress(sessionID, 2, progressedTodos)
 
     // when
+    state.awaitingPostInjectionProgressCheck = true
     const stagnatedAgainUpdate = sessionStateStore.trackContinuationProgress(sessionID, 2, progressedTodos)
 
     // then

src/hooks/todo-continuation-enforcer/session-state.ts

@@ -105,6 +105,7 @@ export function createSessionStateStore(): SessionStateStore {
       currentTodoStatusSignature !== undefined
       && trackedSession.lastTodoStatusSignature !== undefined
       && currentTodoStatusSignature !== trackedSession.lastTodoStatusSignature
+    const hadSuccessfulInjectionAwaitingProgressCheck = state.awaitingPostInjectionProgressCheck === true
 
     state.lastIncompleteCount = incompleteCount
     if (currentCompletedCount !== undefined) {
@@ -125,6 +126,7 @@ export function createSessionStateStore(): SessionStateStore {
 
     if (incompleteCount < previousIncompleteCount || hasCompletedMoreTodos || hasTodoStatusChanged) {
       state.stagnationCount = 0
+      state.awaitingPostInjectionProgressCheck = false
       return {
         previousIncompleteCount,
         stagnationCount: state.stagnationCount,
@@ -132,7 +134,7 @@ export function createSessionStateStore(): SessionStateStore {
       }
     }
 
-    if (state.lastInjectedAt === undefined) {
+    if (!hadSuccessfulInjectionAwaitingProgressCheck) {
       return {
         previousIncompleteCount,
         stagnationCount: state.stagnationCount,
@@ -140,6 +142,7 @@ export function createSessionStateStore(): SessionStateStore {
       }
     }
 
+    state.awaitingPostInjectionProgressCheck = false
     state.stagnationCount += 1
     return {
       previousIncompleteCount,
@@ -158,6 +161,7 @@ export function createSessionStateStore(): SessionStateStore {
 
     state.lastIncompleteCount = undefined
     state.stagnationCount = 0
+    state.awaitingPostInjectionProgressCheck = false
     trackedSession.lastCompletedCount = undefined
     trackedSession.lastTodoStatusSignature = undefined
   }

src/hooks/todo-continuation-enforcer/todo-continuation-enforcer.test.ts

@@ -668,6 +668,42 @@ describe("todo-continuation-enforcer", () => {
     expect(promptCalls).toHaveLength(MAX_CONSECUTIVE_FAILURES)
   }, { timeout: 30000 })
 
+  test("should not stop retries early for unchanged todos when injections keep failing", async () => {
+    //#given
+    const sessionID = "main-unchanged-todos-max-failures"
+    setMainSession(sessionID)
+    const mockInput = createMockPluginInput()
+    mockInput.client.session.todo = async () => ({
+      data: [
+        { id: "1", content: "Task 1", status: "pending", priority: "high" },
+      ],
+    })
+    mockInput.client.session.promptAsync = async (opts: PromptRequestOptions) => {
+      promptCalls.push({
+        sessionID: opts.path.id,
+        agent: opts.body.agent,
+        model: opts.body.model,
+        text: opts.body.parts[0].text,
+      })
+      throw new Error("simulated auth failure")
+    }
+    const hook = createTodoContinuationEnforcer(mockInput, {})
+
+    //#when
+    for (let index = 0; index < MAX_CONSECUTIVE_FAILURES; index++) {
+      await hook.handler({ event: { type: "session.idle", properties: { sessionID } } })
+      await fakeTimers.advanceBy(2500, true)
+      if (index < MAX_CONSECUTIVE_FAILURES - 1) {
+        await fakeTimers.advanceClockBy(1_000_000)
+      }
+    }
+    await hook.handler({ event: { type: "session.idle", properties: { sessionID } } })
+    await fakeTimers.advanceBy(2500, true)
+
+    //#then
+    expect(promptCalls).toHaveLength(MAX_CONSECUTIVE_FAILURES)
+  }, { timeout: 30000 })
+
   test("should resume retries after reset window when max failures reached", async () => {
     //#given
     const sessionID = "main-recovery-after-max-failures"

src/hooks/todo-continuation-enforcer/types.ts

@@ -29,6 +29,7 @@ export interface SessionState {
   abortDetectedAt?: number
   lastIncompleteCount?: number
   lastInjectedAt?: number
+  awaitingPostInjectionProgressCheck?: boolean
   inFlight?: boolean
   stagnationCount: number
   consecutiveFailures: number