diff --git a/backend/app/gateway/routers/memory.py b/backend/app/gateway/routers/memory.py
index 7a074100a..6ee546924 100644
--- a/backend/app/gateway/routers/memory.py
+++ b/backend/app/gateway/routers/memory.py
@@ -49,6 +49,7 @@ class Fact(BaseModel):
     confidence: float = Field(default=0.5, description="Confidence score (0-1)")
     createdAt: str = Field(default="", description="Creation timestamp")
     source: str = Field(default="unknown", description="Source thread ID")
+    sourceError: str | None = Field(default=None, description="Optional description of the prior mistake or wrong approach")
 
 
 class MemoryResponse(BaseModel):
@@ -108,6 +109,7 @@ class MemoryStatusResponse(BaseModel):
 @router.get(
     "/memory",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Get Memory Data",
     description="Retrieve the current global memory data including user context, history, and facts.",
 )
@@ -152,6 +154,7 @@ async def get_memory() -> MemoryResponse:
 @router.post(
     "/memory/reload",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Reload Memory Data",
     description="Reload memory data from the storage file, refreshing the in-memory cache.",
 )
@@ -171,6 +174,7 @@ async def reload_memory() -> MemoryResponse:
 @router.delete(
     "/memory",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Clear All Memory Data",
     description="Delete all saved memory data and reset the memory structure to an empty state.",
 )
@@ -187,6 +191,7 @@ async def clear_memory() -> MemoryResponse:
 @router.post(
     "/memory/facts",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Create Memory Fact",
     description="Create a single saved memory fact manually.",
 )
@@ -209,6 +214,7 @@ async def create_memory_fact_endpoint(request: FactCreateRequest) -> MemoryRespo
 @router.delete(
     "/memory/facts/{fact_id}",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Delete Memory Fact",
     description="Delete a single saved memory fact by its fact id.",
 )
@@ -227,6 +233,7 @@ async def delete_memory_fact_endpoint(fact_id: str) -> MemoryResponse:
 @router.patch(
     "/memory/facts/{fact_id}",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Patch Memory Fact",
     description="Partially update a single saved memory fact by its fact id while preserving omitted fields.",
 )
@@ -252,6 +259,7 @@ async def update_memory_fact_endpoint(fact_id: str, request: FactPatchRequest) -
 @router.get(
     "/memory/export",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Export Memory Data",
     description="Export the current global memory data as JSON for backup or transfer.",
 )
@@ -264,6 +272,7 @@ async def export_memory() -> MemoryResponse:
 @router.post(
     "/memory/import",
     response_model=MemoryResponse,
+    response_model_exclude_none=True,
     summary="Import Memory Data",
     description="Import and overwrite the current global memory data from a JSON payload.",
 )
@@ -317,6 +326,7 @@ async def get_memory_config_endpoint() -> MemoryConfigResponse:
 @router.get(
     "/memory/status",
     response_model=MemoryStatusResponse,
+    response_model_exclude_none=True,
     summary="Get Memory Status",
     description="Retrieve both memory configuration and current data in a single request.",
 )
diff --git a/backend/packages/harness/deerflow/agents/memory/prompt.py b/backend/packages/harness/deerflow/agents/memory/prompt.py
index 0d4e86d97..e0c04b77e 100644
--- a/backend/packages/harness/deerflow/agents/memory/prompt.py
+++ b/backend/packages/harness/deerflow/agents/memory/prompt.py
@@ -29,6 +29,17 @@ Instructions:
 2. Extract relevant facts, preferences, and context with specific details (numbers, names, technologies)
 3. Update the memory sections as needed following the detailed length guidelines below
 
+Before extracting facts, perform a structured reflection on the conversation:
+1. Error/Retry Detection: Did the agent encounter errors, require retries, or produce incorrect results?
+   If yes, record the root cause and correct approach as a high-confidence fact with category "correction".
+2. User Correction Detection: Did the user correct the agent's direction, understanding, or output?
+   If yes, record the correct interpretation or approach as a high-confidence fact with category "correction".
+   Include what went wrong in "sourceError" only when category is "correction" and the mistake is explicit in the conversation.
+3. Project Constraint Discovery: Were any project-specific constraints discovered during the conversation?
+   If yes, record them as facts with the most appropriate category and confidence.
+
+{correction_hint}
+
 Memory Section Guidelines:
 
 **User Context** (Current state - concise summaries):
@@ -62,6 +73,7 @@ Memory Section Guidelines:
   * context: Background facts (job title, projects, locations, languages)
   * behavior: Working patterns, communication habits, problem-solving approaches
   * goal: Stated objectives, learning targets, project ambitions
+  * correction: Explicit agent mistakes or user corrections, including the correct approach
 - Confidence levels:
   * 0.9-1.0: Explicitly stated facts ("I work on X", "My role is Y")
   * 0.7-0.8: Strongly implied from actions/discussions
@@ -94,7 +106,7 @@ Output Format (JSON):
     "longTermBackground": {{ "summary": "...", "shouldUpdate": true/false }}
   }},
   "newFacts": [
-    {{ "content": "...", "category": "preference|knowledge|context|behavior|goal", "confidence": 0.0-1.0 }}
+    {{ "content": "...", "category": "preference|knowledge|context|behavior|goal|correction", "confidence": 0.0-1.0 }}
   ],
   "factsToRemove": ["fact_id_1", "fact_id_2"]
 }}
@@ -104,6 +116,8 @@ Important Rules:
 - Follow length guidelines: workContext/personalContext are concise (1-3 sentences), topOfMind and history sections are detailed (paragraphs)
 - Include specific metrics, version numbers, and proper nouns in facts
 - Only add facts that are clearly stated (0.9+) or strongly implied (0.7+)
+- Use category "correction" for explicit agent mistakes or user corrections; assign confidence >= 0.95 when the correction is explicit
+- Include "sourceError" only for explicit correction facts when the prior mistake or wrong approach is clearly stated; omit it otherwise
 - Remove facts that are contradicted by new information
 - When updating topOfMind, integrate new focus areas while removing completed/abandoned ones
   Keep 3-5 concurrent focus themes that are still active and relevant
@@ -126,7 +140,7 @@ Message:
 Extract facts in this JSON format:
 {{
   "facts": [
-    {{ "content": "...", "category": "preference|knowledge|context|behavior|goal", "confidence": 0.0-1.0 }}
+    {{ "content": "...", "category": "preference|knowledge|context|behavior|goal|correction", "confidence": 0.0-1.0 }}
   ]
 }}
 
@@ -136,6 +150,7 @@ Categories:
 - context: Background context (location, job, projects)
 - behavior: Behavioral patterns
 - goal: User's goals or objectives
+- correction: Explicit corrections or mistakes to avoid repeating
 
 Rules:
 - Only extract clear, specific facts
@@ -262,7 +277,11 @@ def format_memory_for_injection(memory_data: dict[str, Any], max_tokens: int = 2
                 continue
             category = str(fact.get("category", "context")).strip() or "context"
             confidence = _coerce_confidence(fact.get("confidence"), default=0.0)
-            line = f"- [{category} | {confidence:.2f}] {content}"
+            source_error = fact.get("sourceError")
+            if category == "correction" and isinstance(source_error, str) and source_error.strip():
+                line = f"- [{category} | {confidence:.2f}] {content} (avoid: {source_error.strip()})"
+            else:
+                line = f"- [{category} | {confidence:.2f}] {content}"
 
             # Each additional line is preceded by a newline (except the first).
             line_text = ("\n" + line) if fact_lines else line
diff --git a/backend/packages/harness/deerflow/agents/memory/queue.py b/backend/packages/harness/deerflow/agents/memory/queue.py
index a9a683860..6d777a67e 100644
--- a/backend/packages/harness/deerflow/agents/memory/queue.py
+++ b/backend/packages/harness/deerflow/agents/memory/queue.py
@@ -20,6 +20,7 @@ class ConversationContext:
     messages: list[Any]
     timestamp: datetime = field(default_factory=datetime.utcnow)
     agent_name: str | None = None
+    correction_detected: bool = False
 
 
 class MemoryUpdateQueue:
@@ -37,25 +38,38 @@ class MemoryUpdateQueue:
         self._timer: threading.Timer | None = None
         self._processing = False
 
-    def add(self, thread_id: str, messages: list[Any], agent_name: str | None = None) -> None:
+    def add(
+        self,
+        thread_id: str,
+        messages: list[Any],
+        agent_name: str | None = None,
+        correction_detected: bool = False,
+    ) -> None:
         """Add a conversation to the update queue.
 
         Args:
             thread_id: The thread ID.
             messages: The conversation messages.
             agent_name: If provided, memory is stored per-agent. If None, uses global memory.
+            correction_detected: Whether recent turns include an explicit correction signal.
         """
         config = get_memory_config()
         if not config.enabled:
             return
 
-        context = ConversationContext(
-            thread_id=thread_id,
-            messages=messages,
-            agent_name=agent_name,
-        )
-
         with self._lock:
+            existing_context = next(
+                (context for context in self._queue if context.thread_id == thread_id),
+                None,
+            )
+            merged_correction_detected = correction_detected or (existing_context.correction_detected if existing_context is not None else False)
+            context = ConversationContext(
+                thread_id=thread_id,
+                messages=messages,
+                agent_name=agent_name,
+                correction_detected=merged_correction_detected,
+            )
+
             # Check if this thread already has a pending update
             # If so, replace it with the newer one
             self._queue = [c for c in self._queue if c.thread_id != thread_id]
@@ -115,6 +129,7 @@ class MemoryUpdateQueue:
                         messages=context.messages,
                         thread_id=context.thread_id,
                         agent_name=context.agent_name,
+                        correction_detected=context.correction_detected,
                     )
                     if success:
                         logger.info("Memory updated successfully for thread %s", context.thread_id)
diff --git a/backend/packages/harness/deerflow/agents/memory/updater.py b/backend/packages/harness/deerflow/agents/memory/updater.py
index e8c8b5898..c59749d7b 100644
--- a/backend/packages/harness/deerflow/agents/memory/updater.py
+++ b/backend/packages/harness/deerflow/agents/memory/updater.py
@@ -266,13 +266,20 @@ class MemoryUpdater:
         model_name = self._model_name or config.model_name
         return create_chat_model(name=model_name, thinking_enabled=False)
 
-    def update_memory(self, messages: list[Any], thread_id: str | None = None, agent_name: str | None = None) -> bool:
+    def update_memory(
+        self,
+        messages: list[Any],
+        thread_id: str | None = None,
+        agent_name: str | None = None,
+        correction_detected: bool = False,
+    ) -> bool:
         """Update memory based on conversation messages.
 
         Args:
             messages: List of conversation messages.
             thread_id: Optional thread ID for tracking source.
             agent_name: If provided, updates per-agent memory. If None, updates global memory.
+            correction_detected: Whether recent turns include an explicit correction signal.
 
         Returns:
             True if update was successful, False otherwise.
@@ -295,9 +302,19 @@ class MemoryUpdater:
                 return False
 
             # Build prompt
+            correction_hint = ""
+            if correction_detected:
+                correction_hint = (
+                    "IMPORTANT: Explicit correction signals were detected in this conversation. "
+                    "Pay special attention to what the agent got wrong, what the user corrected, "
+                    "and record the correct approach as a fact with category "
+                    '"correction" and confidence >= 0.95 when appropriate.'
+                )
+
             prompt = MEMORY_UPDATE_PROMPT.format(
                 current_memory=json.dumps(current_memory, indent=2),
                 conversation=conversation_text,
+                correction_hint=correction_hint,
             )
 
             # Call LLM
@@ -383,6 +400,8 @@ class MemoryUpdater:
             confidence = fact.get("confidence", 0.5)
             if confidence >= config.fact_confidence_threshold:
                 raw_content = fact.get("content", "")
+                if not isinstance(raw_content, str):
+                    continue
                 normalized_content = raw_content.strip()
                 fact_key = _fact_content_key(normalized_content)
                 if fact_key is not None and fact_key in existing_fact_keys:
@@ -396,6 +415,11 @@ class MemoryUpdater:
                     "createdAt": now,
                     "source": thread_id or "unknown",
                 }
+                source_error = fact.get("sourceError")
+                if isinstance(source_error, str):
+                    normalized_source_error = source_error.strip()
+                    if normalized_source_error:
+                        fact_entry["sourceError"] = normalized_source_error
                 current_memory["facts"].append(fact_entry)
                 if fact_key is not None:
                     existing_fact_keys.add(fact_key)
@@ -412,16 +436,22 @@ class MemoryUpdater:
         return current_memory
 
 
-def update_memory_from_conversation(messages: list[Any], thread_id: str | None = None, agent_name: str | None = None) -> bool:
+def update_memory_from_conversation(
+    messages: list[Any],
+    thread_id: str | None = None,
+    agent_name: str | None = None,
+    correction_detected: bool = False,
+) -> bool:
     """Convenience function to update memory from a conversation.
 
     Args:
         messages: List of conversation messages.
         thread_id: Optional thread ID.
         agent_name: If provided, updates per-agent memory. If None, updates global memory.
+        correction_detected: Whether recent turns include an explicit correction signal.
 
     Returns:
         True if successful, False otherwise.
     """
     updater = MemoryUpdater()
-    return updater.update_memory(messages, thread_id, agent_name)
+    return updater.update_memory(messages, thread_id, agent_name, correction_detected)
diff --git a/backend/packages/harness/deerflow/agents/middlewares/memory_middleware.py b/backend/packages/harness/deerflow/agents/middlewares/memory_middleware.py
index 90907b6e9..6215a2957 100644
--- a/backend/packages/harness/deerflow/agents/middlewares/memory_middleware.py
+++ b/backend/packages/harness/deerflow/agents/middlewares/memory_middleware.py
@@ -14,6 +14,21 @@ from deerflow.config.memory_config import get_memory_config
 
 logger = logging.getLogger(__name__)
 
+_UPLOAD_BLOCK_RE = re.compile(r"<uploaded_files>[\s\S]*?</uploaded_files>\n*", re.IGNORECASE)
+_CORRECTION_PATTERNS = (
+    re.compile(r"\bthat(?:'s| is) (?:wrong|incorrect)\b", re.IGNORECASE),
+    re.compile(r"\byou misunderstood\b", re.IGNORECASE),
+    re.compile(r"\btry again\b", re.IGNORECASE),
+    re.compile(r"\bredo\b", re.IGNORECASE),
+    re.compile(r"不对"),
+    re.compile(r"你理解错了"),
+    re.compile(r"你理解有误"),
+    re.compile(r"重试"),
+    re.compile(r"重新来"),
+    re.compile(r"换一种"),
+    re.compile(r"改用"),
+)
+
 
 class MemoryMiddlewareState(AgentState):
     """Compatible with the `ThreadState` schema."""
@@ -21,6 +36,22 @@ class MemoryMiddlewareState(AgentState):
     pass
 
 
+def _extract_message_text(message: Any) -> str:
+    """Extract plain text from message content for filtering and signal detection."""
+    content = getattr(message, "content", "")
+    if isinstance(content, list):
+        text_parts: list[str] = []
+        for part in content:
+            if isinstance(part, str):
+                text_parts.append(part)
+            elif isinstance(part, dict):
+                text_val = part.get("text")
+                if isinstance(text_val, str):
+                    text_parts.append(text_val)
+        return " ".join(text_parts)
+    return str(content)
+
+
 def _filter_messages_for_memory(messages: list[Any]) -> list[Any]:
     """Filter messages to keep only user inputs and final assistant responses.
 
@@ -44,18 +75,13 @@ def _filter_messages_for_memory(messages: list[Any]) -> list[Any]:
     Returns:
         Filtered list containing only user inputs and final assistant responses.
     """
-    _UPLOAD_BLOCK_RE = re.compile(r"<uploaded_files>[\s\S]*?</uploaded_files>\n*", re.IGNORECASE)
-
     filtered = []
     skip_next_ai = False
     for msg in messages:
         msg_type = getattr(msg, "type", None)
 
         if msg_type == "human":
-            content = getattr(msg, "content", "")
-            if isinstance(content, list):
-                content = " ".join(p.get("text", "") for p in content if isinstance(p, dict))
-            content_str = str(content)
+            content_str = _extract_message_text(msg)
             if "<uploaded_files>" in content_str:
                 # Strip the ephemeral upload block; keep the user's real question.
                 stripped = _UPLOAD_BLOCK_RE.sub("", content_str).strip()
@@ -87,6 +113,25 @@ def _filter_messages_for_memory(messages: list[Any]) -> list[Any]:
     return filtered
 
 
+def detect_correction(messages: list[Any]) -> bool:
+    """Detect explicit user corrections in recent conversation turns.
+
+    The queue keeps only one pending context per thread, so callers pass the
+    latest filtered message list. Checking only recent user turns keeps signal
+    detection conservative while avoiding stale corrections from long histories.
+    """
+    recent_user_msgs = [msg for msg in messages[-6:] if getattr(msg, "type", None) == "human"]
+
+    for msg in recent_user_msgs:
+        content = _extract_message_text(msg).strip()
+        if not content:
+            continue
+        if any(pattern.search(content) for pattern in _CORRECTION_PATTERNS):
+            return True
+
+    return False
+
+
 class MemoryMiddleware(AgentMiddleware[MemoryMiddlewareState]):
     """Middleware that queues conversation for memory update after agent execution.
 
@@ -150,7 +195,13 @@ class MemoryMiddleware(AgentMiddleware[MemoryMiddlewareState]):
             return None
 
         # Queue the filtered conversation for memory update
+        correction_detected = detect_correction(filtered_messages)
         queue = get_memory_queue()
-        queue.add(thread_id=thread_id, messages=filtered_messages, agent_name=self._agent_name)
+        queue.add(
+            thread_id=thread_id,
+            messages=filtered_messages,
+            agent_name=self._agent_name,
+            correction_detected=correction_detected,
+        )
 
         return None
diff --git a/backend/tests/test_memory_prompt_injection.py b/backend/tests/test_memory_prompt_injection.py
index ab1f0a783..d33b69a92 100644
--- a/backend/tests/test_memory_prompt_injection.py
+++ b/backend/tests/test_memory_prompt_injection.py
@@ -119,3 +119,38 @@ def test_format_memory_skips_non_string_content_facts() -> None:
     # The formatted line for a list content would be "- [knowledge | 0.85] ['list']".
     assert "| 0.85]" not in result
     assert "Valid fact" in result
+
+
+def test_format_memory_renders_correction_source_error() -> None:
+    memory_data = {
+        "facts": [
+            {
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+                "sourceError": "The agent previously suggested npm start.",
+            }
+        ]
+    }
+
+    result = format_memory_for_injection(memory_data, max_tokens=2000)
+
+    assert "Use make dev for local development." in result
+    assert "avoid: The agent previously suggested npm start." in result
+
+
+def test_format_memory_renders_correction_without_source_error_normally() -> None:
+    memory_data = {
+        "facts": [
+            {
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+            }
+        ]
+    }
+
+    result = format_memory_for_injection(memory_data, max_tokens=2000)
+
+    assert "Use make dev for local development." in result
+    assert "avoid:" not in result
diff --git a/backend/tests/test_memory_queue.py b/backend/tests/test_memory_queue.py
new file mode 100644
index 000000000..6ef91a142
--- /dev/null
+++ b/backend/tests/test_memory_queue.py
@@ -0,0 +1,50 @@
+from unittest.mock import MagicMock, patch
+
+from deerflow.agents.memory.queue import ConversationContext, MemoryUpdateQueue
+from deerflow.config.memory_config import MemoryConfig
+
+
+def _memory_config(**overrides: object) -> MemoryConfig:
+    config = MemoryConfig()
+    for key, value in overrides.items():
+        setattr(config, key, value)
+    return config
+
+
+def test_queue_add_preserves_existing_correction_flag_for_same_thread() -> None:
+    queue = MemoryUpdateQueue()
+
+    with (
+        patch("deerflow.agents.memory.queue.get_memory_config", return_value=_memory_config(enabled=True)),
+        patch.object(queue, "_reset_timer"),
+    ):
+        queue.add(thread_id="thread-1", messages=["first"], correction_detected=True)
+        queue.add(thread_id="thread-1", messages=["second"], correction_detected=False)
+
+    assert len(queue._queue) == 1
+    assert queue._queue[0].messages == ["second"]
+    assert queue._queue[0].correction_detected is True
+
+
+def test_process_queue_forwards_correction_flag_to_updater() -> None:
+    queue = MemoryUpdateQueue()
+    queue._queue = [
+        ConversationContext(
+            thread_id="thread-1",
+            messages=["conversation"],
+            agent_name="lead_agent",
+            correction_detected=True,
+        )
+    ]
+    mock_updater = MagicMock()
+    mock_updater.update_memory.return_value = True
+
+    with patch("deerflow.agents.memory.updater.MemoryUpdater", return_value=mock_updater):
+        queue._process_queue()
+
+    mock_updater.update_memory.assert_called_once_with(
+        messages=["conversation"],
+        thread_id="thread-1",
+        agent_name="lead_agent",
+        correction_detected=True,
+    )
diff --git a/backend/tests/test_memory_router.py b/backend/tests/test_memory_router.py
index 39134c61d..23a4f30fe 100644
--- a/backend/tests/test_memory_router.py
+++ b/backend/tests/test_memory_router.py
@@ -72,6 +72,56 @@ def test_import_memory_route_returns_imported_memory() -> None:
     assert response.json()["facts"] == imported_memory["facts"]
 
 
+def test_export_memory_route_preserves_source_error() -> None:
+    app = FastAPI()
+    app.include_router(memory.router)
+    exported_memory = _sample_memory(
+        facts=[
+            {
+                "id": "fact_correction",
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+                "createdAt": "2026-03-20T00:00:00Z",
+                "source": "thread-1",
+                "sourceError": "The agent previously suggested npm start.",
+            }
+        ]
+    )
+
+    with patch("app.gateway.routers.memory.get_memory_data", return_value=exported_memory):
+        with TestClient(app) as client:
+            response = client.get("/api/memory/export")
+
+    assert response.status_code == 200
+    assert response.json()["facts"][0]["sourceError"] == "The agent previously suggested npm start."
+
+
+def test_import_memory_route_preserves_source_error() -> None:
+    app = FastAPI()
+    app.include_router(memory.router)
+    imported_memory = _sample_memory(
+        facts=[
+            {
+                "id": "fact_correction",
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+                "createdAt": "2026-03-20T00:00:00Z",
+                "source": "thread-1",
+                "sourceError": "The agent previously suggested npm start.",
+            }
+        ]
+    )
+
+    with patch("app.gateway.routers.memory.import_memory_data", return_value=imported_memory):
+        with TestClient(app) as client:
+            response = client.post("/api/memory/import", json=imported_memory)
+
+    assert response.status_code == 200
+    assert response.json()["facts"][0]["sourceError"] == "The agent previously suggested npm start."
+
+
 def test_clear_memory_route_returns_cleared_memory() -> None:
     app = FastAPI()
     app.include_router(memory.router)
diff --git a/backend/tests/test_memory_updater.py b/backend/tests/test_memory_updater.py
index f7b48228a..6309cf9f6 100644
--- a/backend/tests/test_memory_updater.py
+++ b/backend/tests/test_memory_updater.py
@@ -146,6 +146,53 @@ def test_apply_updates_preserves_threshold_and_max_facts_trimming() -> None:
     assert result["facts"][1]["source"] == "thread-9"
 
 
+def test_apply_updates_preserves_source_error() -> None:
+    updater = MemoryUpdater()
+    current_memory = _make_memory()
+    update_data = {
+        "newFacts": [
+            {
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+                "sourceError": "The agent previously suggested npm start.",
+            }
+        ]
+    }
+
+    with patch(
+        "deerflow.agents.memory.updater.get_memory_config",
+        return_value=_memory_config(max_facts=100, fact_confidence_threshold=0.7),
+    ):
+        result = updater._apply_updates(current_memory, update_data, thread_id="thread-correction")
+
+    assert result["facts"][0]["sourceError"] == "The agent previously suggested npm start."
+    assert result["facts"][0]["category"] == "correction"
+
+
+def test_apply_updates_ignores_empty_source_error() -> None:
+    updater = MemoryUpdater()
+    current_memory = _make_memory()
+    update_data = {
+        "newFacts": [
+            {
+                "content": "Use make dev for local development.",
+                "category": "correction",
+                "confidence": 0.95,
+                "sourceError": "   ",
+            }
+        ]
+    }
+
+    with patch(
+        "deerflow.agents.memory.updater.get_memory_config",
+        return_value=_memory_config(max_facts=100, fact_confidence_threshold=0.7),
+    ):
+        result = updater._apply_updates(current_memory, update_data, thread_id="thread-correction")
+
+    assert "sourceError" not in result["facts"][0]
+
+
 def test_clear_memory_data_resets_all_sections() -> None:
     with patch("deerflow.agents.memory.updater._save_memory_to_file", return_value=True):
         result = clear_memory_data()
@@ -522,3 +569,53 @@ class TestUpdateMemoryStructuredResponse:
             result = updater.update_memory([msg, ai_msg])
 
         assert result is True
+
+    def test_correction_hint_injected_when_detected(self):
+        updater = MemoryUpdater()
+        valid_json = '{"user": {}, "history": {}, "newFacts": [], "factsToRemove": []}'
+        model = self._make_mock_model(valid_json)
+
+        with (
+            patch.object(updater, "_get_model", return_value=model),
+            patch("deerflow.agents.memory.updater.get_memory_config", return_value=_memory_config(enabled=True)),
+            patch("deerflow.agents.memory.updater.get_memory_data", return_value=_make_memory()),
+            patch("deerflow.agents.memory.updater.get_memory_storage", return_value=MagicMock(save=MagicMock(return_value=True))),
+        ):
+            msg = MagicMock()
+            msg.type = "human"
+            msg.content = "No, that's wrong."
+            ai_msg = MagicMock()
+            ai_msg.type = "ai"
+            ai_msg.content = "Understood"
+            ai_msg.tool_calls = []
+
+            result = updater.update_memory([msg, ai_msg], correction_detected=True)
+
+        assert result is True
+        prompt = model.invoke.call_args[0][0]
+        assert "Explicit correction signals were detected" in prompt
+
+    def test_correction_hint_empty_when_not_detected(self):
+        updater = MemoryUpdater()
+        valid_json = '{"user": {}, "history": {}, "newFacts": [], "factsToRemove": []}'
+        model = self._make_mock_model(valid_json)
+
+        with (
+            patch.object(updater, "_get_model", return_value=model),
+            patch("deerflow.agents.memory.updater.get_memory_config", return_value=_memory_config(enabled=True)),
+            patch("deerflow.agents.memory.updater.get_memory_data", return_value=_make_memory()),
+            patch("deerflow.agents.memory.updater.get_memory_storage", return_value=MagicMock(save=MagicMock(return_value=True))),
+        ):
+            msg = MagicMock()
+            msg.type = "human"
+            msg.content = "Let's talk about memory."
+            ai_msg = MagicMock()
+            ai_msg.type = "ai"
+            ai_msg.content = "Sure"
+            ai_msg.tool_calls = []
+
+            result = updater.update_memory([msg, ai_msg], correction_detected=False)
+
+        assert result is True
+        prompt = model.invoke.call_args[0][0]
+        assert "Explicit correction signals were detected" not in prompt
diff --git a/backend/tests/test_memory_upload_filtering.py b/backend/tests/test_memory_upload_filtering.py
index 45d0dbf4e..1ff0aa3b6 100644
--- a/backend/tests/test_memory_upload_filtering.py
+++ b/backend/tests/test_memory_upload_filtering.py
@@ -10,7 +10,7 @@ persisting in long-term memory:
 from langchain_core.messages import AIMessage, HumanMessage, ToolMessage
 
 from deerflow.agents.memory.updater import _strip_upload_mentions_from_memory
-from deerflow.agents.middlewares.memory_middleware import _filter_messages_for_memory
+from deerflow.agents.middlewares.memory_middleware import _filter_messages_for_memory, detect_correction
 
 # ---------------------------------------------------------------------------
 # Helpers
@@ -134,6 +134,64 @@ class TestFilterMessagesForMemory:
         assert "<uploaded_files>" not in all_content
 
 
+# ===========================================================================
+# detect_correction
+# ===========================================================================
+
+
+class TestDetectCorrection:
+    def test_detects_english_correction_signal(self):
+        msgs = [
+            _human("Please help me run the project."),
+            _ai("Use npm start."),
+            _human("That's wrong, use make dev instead."),
+            _ai("Understood."),
+        ]
+
+        assert detect_correction(msgs) is True
+
+    def test_detects_chinese_correction_signal(self):
+        msgs = [
+            _human("帮我启动项目"),
+            _ai("用 npm start"),
+            _human("不对，改用 make dev"),
+            _ai("明白了"),
+        ]
+
+        assert detect_correction(msgs) is True
+
+    def test_returns_false_without_signal(self):
+        msgs = [
+            _human("Please explain the build setup."),
+            _ai("Here is the build setup."),
+            _human("Thanks, that makes sense."),
+        ]
+
+        assert detect_correction(msgs) is False
+
+    def test_only_checks_recent_messages(self):
+        msgs = [
+            _human("That is wrong, use make dev instead."),
+            _ai("Noted."),
+            _human("Let's discuss tests."),
+            _ai("Sure."),
+            _human("What about linting?"),
+            _ai("Use ruff."),
+            _human("And formatting?"),
+            _ai("Use make format."),
+        ]
+
+        assert detect_correction(msgs) is False
+
+    def test_handles_list_content(self):
+        msgs = [
+            HumanMessage(content=["That is wrong,", {"type": "text", "text": "use make dev instead."}]),
+            _ai("Updated."),
+        ]
+
+        assert detect_correction(msgs) is True
+
+
 # ===========================================================================
 # _strip_upload_mentions_from_memory
 # ===========================================================================