backend/app/api/endpoints/ai_sessions.py

@@ -48,6 +48,7 @@ from app.schemas.ai_session import (
     ChatSessionCreateResponse,
     ChatMessageRequest,
     ChatMessageResponse,
+    SaveTaskLaneRequest,
 )
 from app.services import flowpilot_engine
 from app.services import unified_chat_service
@@ -497,6 +498,33 @@ async def pause_session(
     await db.commit()
 
 
+# ── Save Task Lane ──
+
+@router.put("/{session_id}/task-lane", status_code=204)
+@limiter.limit("30/minute")
+async def save_task_lane(
+    request: Request,
+    session_id: UUID,
+    body: SaveTaskLaneRequest,
+    current_user: Annotated[User, Depends(get_current_active_user)],
+    db: Annotated[AsyncSession, Depends(get_db)],
+    _: None = Depends(require_engineer_or_admin),
+):
+    """Save the current task lane state including user's in-progress responses."""
+    session = await db.get(AISession, session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    if session.user_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Not your session")
+
+    session.pending_task_lane = {
+        "questions": [q.model_dump() for q in body.questions],
+        "actions": [a.model_dump() for a in body.actions],
+        "responses": body.responses,
+    }
+    await db.commit()
+
+
 # ── Resume ──
 
 @router.post("/{session_id}/resume", status_code=204)

backend/app/schemas/ai_session.py

@@ -287,6 +287,16 @@ class ChatMessageResponse(BaseModel):
     questions: list[QuestionItem] | None = None
 
 
+class SaveTaskLaneRequest(BaseModel):
+    """Save the full task lane state (AI items + user responses)."""
+    questions: list[QuestionItem] = []
+    actions: list[ActionItem] = []
+    responses: list[dict[str, Any]] = Field(
+        default_factory=list,
+        description="User's in-progress task responses with state/value",
+    )
+
+
 class AISessionSearchResult(BaseModel):
     """Lightweight session result for Command Palette / autocomplete."""
     id: UUID

frontend/src/api/aiSessions.ts

@@ -110,6 +110,14 @@ export const aiSessionsApi = {
     return response.data
   },
 
+  async saveTaskLane(sessionId: string, data: {
+    questions: Array<{ text: string; context?: string }>;
+    actions: Array<{ label: string; command?: string | null; description?: string }>;
+    responses: Array<Record<string, unknown>>;
+  }): Promise<void> {
+    await apiClient.put(`/ai-sessions/${sessionId}/task-lane`, data)
+  },
+
   async pauseSession(sessionId: string): Promise<void> {
     await apiClient.post(`/ai-sessions/${sessionId}/pause`)
   },

frontend/src/components/assistant/TaskLane.tsx

@@ -5,6 +5,7 @@ import {
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { toast } from '@/lib/toast'
+import { aiSessionsApi } from '@/api/aiSessions'
 import type { ActionItem, QuestionItem } from '@/types/ai-session'
 
 // ── Types ──
@@ -129,10 +130,22 @@ export function TaskLane({ questions, actions, sessionId, onSubmit, onClose, loa
     }
   }, [handleMouseMove, handleMouseUp])
 
-  // Save task state to sessionStorage on every change
+  // Save task state to sessionStorage on every change + debounce to backend
+  const saveTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   useEffect(() => {
-    if (sessionId) saveTaskState(sessionId, tasks)
-  }, [sessionId, tasks])
+    if (!sessionId) return
+    saveTaskState(sessionId, tasks)
+    // Debounce save to backend (2s after last change)
+    if (saveTimerRef.current) clearTimeout(saveTimerRef.current)
+    saveTimerRef.current = setTimeout(() => {
+      aiSessionsApi.saveTaskLane(sessionId, {
+        questions: questions.map(q => ({ text: q.text, context: q.context })),
+        actions: actions.map(a => ({ label: a.label, command: a.command, description: a.description })),
+        responses: tasks as unknown as Array<Record<string, unknown>>,
+      }).catch(() => { /* silent — best-effort save */ })
+    }, 2000)
+    return () => { if (saveTimerRef.current) clearTimeout(saveTimerRef.current) }
+  }, [sessionId, tasks]) // eslint-disable-line react-hooks/exhaustive-deps
 
   // Reset when new tasks come in from AI response
   useEffect(() => {

frontend/src/pages/AssistantChatPage.tsx

@@ -228,6 +228,13 @@ export default function AssistantChatPage() {
           setActiveQuestions(q)
           setActiveActions(a)
           setShowTaskLane(true)
+          // Pre-load user's saved responses into sessionStorage so TaskLane restores them
+          const responses = (detail.pending_task_lane as Record<string, unknown>).responses as unknown[] | undefined
+          if (responses && responses.length > 0) {
+            try {
+              sessionStorage.setItem(`rf-tasklane-state:${chatId}`, JSON.stringify(responses))
+            } catch { /* ignore */ }
+          }
         }
       }
     } catch {