FN-8433: synchronize Planning Mode interview turns

Keep Planning Mode questions, answer history, and the running plan aligned across streaming and recovery paths.

- Reconcile server and client interview state after answers, retries, and missed SSE events.
- Keep persisted mid-interview summaries streaming until explicit validation.
- Add client and route regressions for stale question replay and reconnect behavior.

Files changed:
 .changeset/planning-turn-sync.md                   |   7 +
 packages/dashboard/app/api/legacy.ts               |   6 +-
 .../dashboard/app/components/PlanningModeModal.tsx | 153 +++++++++++++++++----
 .../PlanningModeModal.planning-flow.test.tsx       | 117 ++++++++++++++++
 .../src/__tests__/routes-planning.test.ts          |  68 +++++++++
 .../src/routes/register-planning-subtask-routes.ts |  25 ++--
 6 files changed, 340 insertions(+), 36 deletions(-)

Fusion-Task-Id: FN-8433

Fusion-Task-Lineage: d59a5b75-6ea0-4f97-83ab-ede770b4ae06

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

.changeset/planning-turn-sync.md

@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": patch
+---
+
+summary: Keep Planning Mode questions and the running plan in sync after each answer.
+category: fix
+dev: Mid-interview SSE no longer terminalizes on running summary; client ignores stale answered questions and reconciles submit failures against server state.

packages/dashboard/app/api/legacy.ts

@@ -2500,6 +2500,8 @@ export interface PlanningSession {
   summary: PlanningSummary | null;
 }
 
+/** The response endpoint may synchronously return a generated next question before SSE delivers it. */
+export type PlanningResponse = PlanningSession | { type: "question"; data: PlanningQuestion };
 
 /** SSE event types for planning session streaming */
 export type PlanningStreamEvent =
@@ -2632,8 +2634,8 @@ export function respondToPlanning(
   sessionId: string,
   responses: Record<string, unknown>,
   projectId?: string,
-): Promise<PlanningSession> {
-  return api<PlanningSession>(withProjectId("/planning/respond", projectId), {
+): Promise<PlanningResponse> {
+  return api<PlanningResponse>(withProjectId("/planning/respond", projectId), {
     method: "POST",
     body: JSON.stringify({ sessionId, responses }),
   });

packages/dashboard/app/components/PlanningModeModal.tsx

@@ -334,9 +334,11 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
   const [error, setError] = useState<string | null>(null);
   const [, setResponseHistory] = useState<QuestionResponse[]>([]);
   const [conversationHistory, setConversationHistory] = useState<ConversationHistoryEntry[]>([]);
+  const conversationHistoryRef = useRef<ConversationHistoryEntry[]>([]);
   const [editedSummary, setEditedSummary] = useState<PlanningSummary | null>(null);
   // FNXC:PlanningMode 2026-07-19-15:35: FN-8400 keeps the in-progress plan independent of the center-pane view so it remains visible while the next question is generating.
   const [runningSummary, setRunningSummary] = useState<PlanningSummary | null>(null);
+  const runningSummaryRef = useRef<PlanningSummary | null>(null);
   const [branchMode, setBranchMode] = useState<"project-default" | "auto-new" | "existing" | "custom-new">("project-default");
   const [branchName, setBranchName] = useState("");
   const [baseBranch, setBaseBranch] = useState("");
@@ -361,6 +363,7 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
   Pending state belongs to the selected history entry and never replaces the running plan pane.
   */
   const [editingQuestionId, setEditingQuestionId] = useState<string | null>(null);
+  const editingQuestionIdRef = useRef<string | null>(null);
   const [isHistoryEditPending, setIsHistoryEditPending] = useState(false);
   const [isRenamingSession, setIsRenamingSession] = useState(false);
   const [sessionTitleDraft, setSessionTitleDraft] = useState("");
@@ -641,6 +644,18 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
     streamingOutputRef.current = streamingOutput;
   }, [streamingOutput]);
 
+  useEffect(() => {
+    conversationHistoryRef.current = conversationHistory;
+  }, [conversationHistory]);
+
+  useEffect(() => {
+    runningSummaryRef.current = runningSummary;
+  }, [runningSummary]);
+
+  useEffect(() => {
+    editingQuestionIdRef.current = editingQuestionId;
+  }, [editingQuestionId]);
+
   // Keep the streaming AI thinking pane pinned to the bottom as new tokens
   // arrive. If the user has scrolled up to read earlier output, we leave the
   // scroll position alone — only auto-follow when they're already near the
@@ -698,11 +713,29 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
         if (cancelled || !session) return;
         if (currentSessionIdRef.current !== sessionId) return;
         if (session.status === "awaiting_input" && session.currentQuestion) {
+          /*
+          FNXC:PlanningTurnReconciliation 2026-07-20-10:36:
+          Missed SSE recovery must hydrate the server's entire interview turn together. Keeping
+          the persisted Q&A history and running result while replacing only the center question
+          prevents an already-answered question or a blank plan pane from representing a
+          different turn than the server.
+          */
           resetPlanningAutoRetryBudget();
-          const question = JSON.parse(session.currentQuestion) as PlanningQuestion;
+          const question = normalizeQuestionOptions(JSON.parse(session.currentQuestion) as PlanningQuestion);
+          const history = parseConversationHistory(session.conversationHistory);
+          const summary = session.result
+            ? normalizePlanningSummary(JSON.parse(session.result) as PlanningSummary)
+            : null;
+          conversationHistoryRef.current = history;
+          runningSummaryRef.current = summary;
+          setConversationHistory(history);
+          setResponseHistory(history
+            .map((entry) => entry.response)
+            .filter((response): response is QuestionResponse => Boolean(response && typeof response === "object" && !Array.isArray(response))));
+          setRunningSummary(summary);
           setView({
             type: "question",
-            session: { sessionId, currentQuestion: question, summary: null },
+            session: { sessionId, currentQuestion: question, summary },
           });
           setStreamingOutput("");
         } else if (session.status === "complete" && session.result) {
@@ -887,6 +920,16 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
         onQuestion: (question) => {
           if (isStaleEvent()) return;
           const normalizedQuestion = normalizeQuestionOptions(question);
+          const isAnsweredQuestion = conversationHistoryRef.current.some(
+            (entry) => entry.question?.id === normalizedQuestion.id && entry.response !== undefined,
+          );
+          /*
+          FNXC:PlanningTurnReconciliation 2026-07-20-10:36:
+          Buffered SSE reconnects may replay a question that the user already submitted. An
+          answered question may only return through the explicit rewind/edit branch, never as a
+          passive stream catch-up event that overwrites a newer awaiting-input question.
+          */
+          if (isAnsweredQuestion && editingQuestionIdRef.current !== normalizedQuestion.id) return;
           setIsReconnecting(false);
           setIsRetrying(false);
           resetPlanningAutoRetryBudget();
@@ -912,7 +955,7 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
 
           setView({
             type: "question",
-            session: { sessionId, currentQuestion: normalizedQuestion, summary: runningSummary },
+            session: { sessionId, currentQuestion: normalizedQuestion, summary: runningSummaryRef.current },
           });
           setStreamingOutput("");
         },
@@ -943,6 +986,7 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
           allowed to enter terminal SummaryView, preventing a first-answer SSE race from ending
           the interview.
           */
+          runningSummaryRef.current = normalizedSummary;
           setRunningSummary(normalizedSummary);
           setView((previous) => previous.type === "question"
             ? {
@@ -1934,7 +1978,9 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
       // Capture before clearing state: the edit branch rewrites this exact history row while
       // the server preserves the other answers and generates the appended next question.
       const submittedEditingQuestionId = editingQuestionId;
+      const historyBeforeSubmit = conversationHistoryRef.current;
       setEditingQuestionId(null);
+      editingQuestionIdRef.current = null;
 
       // Keep the existing SSE connection alive - do NOT close it!
       // The connection established in handleStartPlanning will continue
@@ -1945,23 +1991,22 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
       setResponseHistory((prev) => submittedEditingQuestionId
         ? prev.map((response, index) => conversationHistory.filter((entry) => entry.question && entry.response)[index]?.question?.id === submittedEditingQuestionId ? responses : response)
         : [...prev, responses]);
-      setConversationHistory((prev) => {
-        // Capture any reasoning that accumulated since the last question
-        // (e.g. thinking streamed while the user was reading the question).
-        const currentThinking = streamingOutputRef.current.trim();
-        let updated = prev;
-        if (currentThinking) {
-          const lastEntry = updated[updated.length - 1];
-          if (lastEntry?.thinkingOutput !== currentThinking) {
-            updated = [...updated, { thinkingOutput: currentThinking }];
-          }
+      // Capture any reasoning that accumulated since the last question
+      // (e.g. thinking streamed while the user was reading the question).
+      const currentThinking = streamingOutputRef.current.trim();
+      let optimisticHistory = historyBeforeSubmit;
+      if (currentThinking) {
+        const lastEntry = optimisticHistory[optimisticHistory.length - 1];
+        if (lastEntry?.thinkingOutput !== currentThinking) {
+          optimisticHistory = [...optimisticHistory, { thinkingOutput: currentThinking }];
         }
-        const answer = { question: activeQuestion, response: responses };
-        if (submittedEditingQuestionId) {
-          return updated.map((entry) => entry.question?.id === submittedEditingQuestionId ? answer : entry);
-        }
-        return [...updated, answer];
-      });
+      }
+      const answer = { question: activeQuestion, response: responses };
+      optimisticHistory = submittedEditingQuestionId
+        ? optimisticHistory.map((entry) => entry.question?.id === submittedEditingQuestionId ? answer : entry)
+        : [...optimisticHistory, answer];
+      conversationHistoryRef.current = optimisticHistory;
+      setConversationHistory(optimisticHistory);
       resetPlanningAutoRetryBudget();
       setView({ type: "loading" });
       setStreamingOutput(""); // Clear old thinking output when entering loading state
@@ -1969,11 +2014,63 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
 
       try {
         // Submit response - AI will broadcast events via the already-connected stream
-        await respondToPlanning(sessionId, responses, projectId);
-        // Events (question/summary) will arrive via the existing SSE stream
+        const response = await respondToPlanning(sessionId, responses, projectId);
+        // The stream normally drives this transition. Adopt an already-returned next question
+        // when its event was lost so loading cannot later be replaced by a stale replay.
+        if ("type" in response && response.type === "question" && response.data.id !== activeQuestion.id) {
+          const nextQuestion = normalizeQuestionOptions(response.data);
+          setView({
+            type: "question",
+            session: { sessionId, currentQuestion: nextQuestion, summary: runningSummaryRef.current },
+          });
+        }
       } catch (err) {
-        setError(getErrorMessage(err) || t("planning.failedSubmitResponse", "Failed to submit response"));
-        setView({ type: "question", session });
+        const errorMessage = getErrorMessage(err) || t("planning.failedSubmitResponse", "Failed to submit response");
+        /*
+        FNXC:PlanningTurnReconciliation 2026-07-20-10:36:
+        A rejected HTTP response is ambiguous: the server may have accepted the answer before
+        the connection failed. Rehydrate durable state before restoring the form. If it was not
+        accepted, roll back the optimistic answer so history and the active question still agree.
+        */
+        try {
+          const persisted = await fetchAiSession(sessionId);
+          if (persisted?.status === "awaiting_input" && persisted.currentQuestion) {
+            const history = parseConversationHistory(persisted.conversationHistory);
+            const summary = persisted.result
+              ? normalizePlanningSummary(JSON.parse(persisted.result) as PlanningSummary)
+              : null;
+            const currentQuestion = normalizeQuestionOptions(JSON.parse(persisted.currentQuestion) as PlanningQuestion);
+            conversationHistoryRef.current = history;
+            runningSummaryRef.current = summary;
+            setConversationHistory(history);
+            setResponseHistory(history
+              .map((entry) => entry.response)
+              .filter((response): response is QuestionResponse => Boolean(response && typeof response === "object" && !Array.isArray(response))));
+            setRunningSummary(summary);
+            setError(errorMessage);
+            setView({ type: "question", session: { sessionId, currentQuestion, summary } });
+            return;
+          }
+          if (persisted?.status === "generating") {
+            const history = parseConversationHistory(persisted.conversationHistory);
+            const summary = persisted.result
+              ? normalizePlanningSummary(JSON.parse(persisted.result) as PlanningSummary)
+              : null;
+            conversationHistoryRef.current = history;
+            runningSummaryRef.current = summary;
+            setConversationHistory(history);
+            setRunningSummary(summary);
+            setError(errorMessage);
+            setView({ type: "loading" });
+            return;
+          }
+        } catch {
+          // Fall back to the known pre-submit turn and remove its optimistic answer.
+        }
+        conversationHistoryRef.current = historyBeforeSubmit;
+        setConversationHistory(historyBeforeSubmit);
+        setError(errorMessage);
+        setView({ type: "question", session: { ...session, summary: runningSummaryRef.current } });
       }
     },
     [conversationHistory, editingQuestionId, projectId, resetPlanningAutoRetryBudget, view]
@@ -2158,14 +2255,18 @@ export function PlanningModeModal({ isOpen, onClose, onTaskCreated, onTasksCreat
     try {
       const rewound = await rewindPlanningSession(view.session.sessionId, projectId, questionId);
       setEditingQuestionId(questionId);
-      setConversationHistory(rewound.history.map((item) => ({
+      editingQuestionIdRef.current = questionId;
+      const rewoundHistory = rewound.history.map((item) => ({
         question: item.question,
         response: item.response && typeof item.response === "object" && !Array.isArray(item.response)
           ? item.response as Record<string, unknown>
           : { [item.question.id]: item.response },
         thinkingOutput: item.thinkingOutput,
-      })));
-      const nextSummary = rewound.summary ? normalizePlanningSummary(rewound.summary) : runningSummary;
+      }));
+      conversationHistoryRef.current = rewoundHistory;
+      setConversationHistory(rewoundHistory);
+      const nextSummary = rewound.summary ? normalizePlanningSummary(rewound.summary) : runningSummaryRef.current;
+      runningSummaryRef.current = nextSummary;
       setRunningSummary(nextSummary);
       setView({ type: "question", session: { ...view.session, currentQuestion: rewound.currentQuestion, summary: nextSummary } });
     } catch (err) {

packages/dashboard/app/components/__tests__/PlanningModeModal.planning-flow.test.tsx

@@ -3576,6 +3576,123 @@ describe("PlanningModeModal", () => {
     });
   });
 
+  /*
+  FNXC:PlanningTurnReconciliation 2026-07-20-10:36:
+  These regressions reproduce the operator-visible desync: an answered Q1 must never displace
+  Q2, and recovery must hydrate question, answered history, and running plan as one server turn.
+  */
+  describe("interview turn reconciliation", () => {
+    const secondQuestion: PlanningQuestion = {
+      id: "q-turn-reconciliation-next",
+      type: "text",
+      question: "Which constraint matters most next?",
+    };
+    const secondSummary = {
+      ...mockSummary,
+      title: "Updated synchronized plan",
+      description: "The plan reflects Q1 before asking Q2.",
+    };
+
+    it("keeps Q2 and the latest plan when a stale answered Q1 stream event replays on tablet", async () => {
+      mockViewport("tablet");
+      let streamHandlers: any;
+      mockConnectPlanningStream.mockImplementationOnce((_sessionId: string, _projectId: string | undefined, handlers: any) => {
+        streamHandlers = handlers;
+        queuePlanningStreamEvent(() => handlers.onQuestion?.(mockQuestion));
+        return { close: vi.fn(), isConnected: vi.fn().mockReturnValue(true) };
+      });
+      mockRespondToPlanning.mockImplementationOnce(async () => {
+        queuePlanningStreamEvent(() => {
+          streamHandlers.onSummary?.(secondSummary);
+          streamHandlers.onQuestion?.(secondQuestion);
+        });
+        return { sessionId: "session-123", currentQuestion: null, summary: null };
+      });
+
+      render(<PlanningModeModal isOpen={true} onClose={mockOnClose} onTaskCreated={mockOnTaskCreated} onTasksCreated={vi.fn()} tasks={mockTasks} />);
+      fireEvent.change(screen.getByPlaceholderText(/e.g., Build a user authentication/), { target: { value: "Synchronize every turn" } });
+      fireEvent.click(screen.getByText("Start Planning"));
+      fireEvent.click(await screen.findByText("Medium"));
+      fireEvent.click(screen.getByRole("button", { name: "Next question" }));
+
+      expect(await screen.findByText(secondQuestion.question)).toBeDefined();
+      expect(screen.getByRole("button", { name: "Question" })).toHaveAttribute("aria-pressed", "true");
+      fireEvent.click(screen.getByRole("button", { name: "Running plan" }));
+      expect(within(screen.getByRole("complementary", { name: "Running plan" })).getByText(secondSummary.title)).toBeDefined();
+      fireEvent.click(screen.getByRole("button", { name: "Answered questions" }));
+      expect(within(screen.getByRole("complementary", { name: "Answered questions" })).getByText(mockQuestion.question)).toBeDefined();
+      fireEvent.click(screen.getByRole("button", { name: "Question" }));
+
+      await act(async () => {
+        streamHandlers.onQuestion?.(mockQuestion);
+      });
+
+      expect(screen.getByText(secondQuestion.question)).toBeDefined();
+      expect(screen.queryByText("Planning Complete!")).toBeNull();
+    });
+
+    it("rolls back an optimistic answer when submit fails before server acceptance", async () => {
+      mockRespondToPlanning.mockRejectedValueOnce(new Error("submit timed out"));
+      mockFetchAiSession.mockResolvedValueOnce({
+        id: "session-123",
+        type: "planning",
+        status: "awaiting_input",
+        title: "Still awaiting Q1",
+        inputPayload: JSON.stringify({ initialPlan: "Recover submit" }),
+        conversationHistory: "[]",
+        currentQuestion: JSON.stringify(mockQuestion),
+        result: JSON.stringify(mockSummary),
+        thinkingOutput: "",
+        projectId: null,
+      });
+
+      render(<PlanningModeModal isOpen={true} onClose={mockOnClose} onTaskCreated={mockOnTaskCreated} onTasksCreated={vi.fn()} tasks={mockTasks} initialPlan="Recover submit" />);
+      await screen.findByText(mockQuestion.question);
+      fireEvent.click(screen.getByText("Medium"));
+      fireEvent.click(screen.getByRole("button", { name: "Next question" }));
+
+      expect(await screen.findByText("submit timed out")).toBeDefined();
+      expect(screen.getByText(mockQuestion.question)).toBeDefined();
+      expect(screen.queryByTestId("conversation-history")).toBeNull();
+      expect(within(screen.getByRole("complementary", { name: "Running plan" })).getByText(mockSummary.title)).toBeDefined();
+    });
+
+    it("hydrates Q2, Q1 history, and running plan after loading poll misses SSE", async () => {
+      const persistedHistory = [{ question: mockQuestion, response: { [mockQuestion.id]: "medium" } }];
+      try {
+        mockRespondToPlanning.mockResolvedValueOnce({ sessionId: "session-123", currentQuestion: null, summary: null });
+        mockFetchAiSession.mockResolvedValueOnce({
+          id: "session-123",
+          type: "planning",
+          status: "awaiting_input",
+          title: "Recovered turn",
+          inputPayload: JSON.stringify({ initialPlan: "Poll recovery" }),
+          conversationHistory: JSON.stringify(persistedHistory),
+          currentQuestion: JSON.stringify(secondQuestion),
+          result: JSON.stringify(secondSummary),
+          thinkingOutput: "",
+          projectId: null,
+        });
+
+        render(<PlanningModeModal isOpen={true} onClose={mockOnClose} onTaskCreated={mockOnTaskCreated} onTasksCreated={vi.fn()} tasks={mockTasks} initialPlan="Poll recovery" />);
+        await screen.findByText(mockQuestion.question);
+        vi.useFakeTimers();
+        fireEvent.click(screen.getByText("Medium"));
+        fireEvent.click(screen.getByRole("button", { name: "Next question" }));
+
+        await act(async () => {
+          await vi.advanceTimersByTimeAsync(8000);
+        });
+
+        expect(screen.getByText(secondQuestion.question)).toBeDefined();
+        expect(within(screen.getByRole("complementary", { name: "Answered questions" })).getByText(mockQuestion.question)).toBeDefined();
+        expect(within(screen.getByRole("complementary", { name: "Running plan" })).getByText(secondSummary.title)).toBeDefined();
+      } finally {
+        vi.useRealTimers();
+      }
+    });
+  });
+
   describe("session rename", () => {
     function renderActiveSessionForRename() {
       mockFetchAiSession.mockResolvedValueOnce({

packages/dashboard/src/__tests__/routes-planning.test.ts

@@ -1459,6 +1459,74 @@ describe("Planning Mode Routes", () => {
         expect(streamRes.body).toContain("What is your preference?");
       });
 
+      /*
+      FNXC:PlanningStreamTurnIdentity 2026-07-20-10:36:
+      A persisted summary is the active interview's running plan, not a completion sentinel.
+      Reconnect must send it before the awaiting-input question and keep the subscription alive.
+      */
+      it("keeps a mid-interview stream open when a running summary and question are persisted", async () => {
+        const startRes = await REQUEST(
+          buildApp(),
+          "POST",
+          "/api/planning/start",
+          JSON.stringify({ initialPlan: "Reconnect a running interview" }),
+          { "Content-Type": "application/json" },
+        );
+        const sessionId = startRes.body.sessionId as string;
+        const { getSession } = await import("../planning.js");
+        const session = await getSession(sessionId);
+        expect(session).toBeDefined();
+
+        const runningSummary = {
+          title: "Running plan",
+          description: "Keep the interview turn aligned.",
+          suggestedSize: "M",
+          keyDeliverables: ["A synchronized interview"],
+        };
+        const nextQuestion = {
+          id: "q-mid-interview",
+          type: "text",
+          question: "What should happen next?",
+        };
+        // @ts-expect-error - test setup mutates the in-memory active session.
+        session!.summary = runningSummary;
+        // @ts-expect-error - test setup mutates the in-memory active session.
+        session!.currentQuestion = nextQuestion;
+
+        const streamPromise = REQUEST(buildApp(), "GET", `/api/planning/${sessionId}/stream`);
+        setTimeout(() => planningStreamManager.broadcast(sessionId, { type: "complete" }), 10);
+        const streamRes = await streamPromise;
+
+        expect(streamRes.body).toContain("event: summary");
+        expect(streamRes.body).toContain(runningSummary.title);
+        expect(streamRes.body).toContain("event: question");
+        expect(streamRes.body).toContain(nextQuestion.question);
+        expect(streamRes.body.indexOf("event: summary")).toBeLessThan(streamRes.body.indexOf("event: question"));
+      });
+
+      it("terminalizes a validated persisted summary session", async () => {
+        const startRes = await REQUEST(
+          buildApp(),
+          "POST",
+          "/api/planning/start",
+          JSON.stringify({ initialPlan: "Validated reconnect" }),
+          { "Content-Type": "application/json" },
+        );
+        const sessionId = startRes.body.sessionId as string;
+        const { getSession } = await import("../planning.js");
+        const session = await getSession(sessionId);
+        expect(session).toBeDefined();
+        // @ts-expect-error - test setup mutates the in-memory terminal session.
+        session!.summary = { title: "Validated plan", description: "Ready", suggestedSize: "S", keyDeliverables: [] };
+        // @ts-expect-error - test setup mutates the in-memory terminal session.
+        session!.validated = true;
+
+        const streamRes = await REQUEST(buildApp(), "GET", `/api/planning/${sessionId}/stream`);
+
+        expect(streamRes.body).toContain("event: summary");
+        expect(streamRes.body).toContain("event: complete");
+      });
+
       it("emits catch-up question event for awaiting_input sessions", async () => {
         // This test verifies the fix for the mismatch where a session was advertised as
         // needing input but the resume path initially entered loading state.

packages/dashboard/src/routes/register-planning-subtask-routes.ts

@@ -1551,6 +1551,13 @@ export function registerPlanningSubtaskRoutes(ctx: ApiRoutesContext, deps: Plann
         }
       }
 
+      /*
+      FNXC:PlanningStreamTurnIdentity 2026-07-20-10:36:
+      A running summary is persisted after every interview turn, so it is catch-up state rather
+      than completion evidence. Reconnect must refresh that plan and continue into the current
+      awaiting-input question; only Validate writes `session.validated`, which authorizes a
+      terminal complete event and closes the stream.
+      */
       if (session.summary) {
         const existing = planningStreamManager.getBufferedEvents(sessionId, 0);
         const lastSummaryEvent = [...existing].reverse().find((event) => event.event === "summary");
@@ -1567,16 +1574,18 @@ export function registerPlanningSubtaskRoutes(ctx: ApiRoutesContext, deps: Plann
           }
         }
 
-        const lastCompleteEvent = [...existing].reverse().find((event) => event.event === "complete");
-        const completeEventId = lastCompleteEvent?.id
-          ?? planningStreamManager.broadcast(sessionId, { type: "complete" });
+        if (session.validated) {
+          const lastCompleteEvent = [...existing].reverse().find((event) => event.event === "complete");
+          const completeEventId = lastCompleteEvent?.id
+            ?? planningStreamManager.broadcast(sessionId, { type: "complete" });
 
-        if (lastEventId === undefined || completeEventId > lastEventId) {
-          writeSSEEvent(res, "complete", JSON.stringify({}), completeEventId);
+          if (lastEventId === undefined || completeEventId > lastEventId) {
+            writeSSEEvent(res, "complete", JSON.stringify({}), completeEventId);
+          }
+
+          res.end();
+          return;
         }
-
-        res.end();
-        return;
       }
 
       // First-connect catch-up should replay buffered thinking chunks so the