diff --git a/lib/canvas/agent-pending-requests.ts b/lib/canvas/agent-pending-requests.ts
index cf2fe9c47..c00f83a30 100644
--- a/lib/canvas/agent-pending-requests.ts
+++ b/lib/canvas/agent-pending-requests.ts
@@ -23,6 +23,16 @@ function normalizeNodeId(value: unknown) {
   return String(value || "").trim();
 }
 
+function shouldConsumePendingRequest(params: {
+  pendingNodeId?: string;
+  detailNodeId?: string;
+  hasDetail: boolean;
+}) {
+  const pendingNodeId = normalizeNodeId(params.pendingNodeId);
+  const detailNodeId = normalizeNodeId(params.detailNodeId);
+  return !params.hasDetail || !pendingNodeId || pendingNodeId === detailNodeId;
+}
+
 export function storeCanvasAgentSlotFillRequest(
   targetWindow: CanvasAgentPendingRequestWindow,
   request: PendingCanvasAgentSlotFillRequest
@@ -42,9 +52,13 @@ export function consumeCanvasAgentSlotFillRequest(
 ) {
   const pending = getPendingCanvasAgentSlotFillRequest(targetWindow);
   if (!pending) return null;
-  const pendingNodeId = normalizeNodeId(pending.nodeId);
-  const detailNodeId = normalizeNodeId(detail?.nodeId);
-  if (!pendingNodeId || pendingNodeId === detailNodeId) {
+  if (
+    shouldConsumePendingRequest({
+      pendingNodeId: pending.nodeId,
+      detailNodeId: detail?.nodeId,
+      hasDetail: Boolean(detail),
+    })
+  ) {
     delete targetWindow.__canvasAgentPendingSlotFillRequest;
   }
   return pending;
@@ -69,9 +83,13 @@ export function consumeCanvasAgentAnnotationEditRequest(
 ) {
   const pending = getPendingCanvasAgentAnnotationEditRequest(targetWindow);
   if (!pending) return null;
-  const pendingNodeId = normalizeNodeId(pending.nodeId);
-  const detailNodeId = normalizeNodeId(detail?.nodeId);
-  if (!pendingNodeId || pendingNodeId === detailNodeId) {
+  if (
+    shouldConsumePendingRequest({
+      pendingNodeId: pending.nodeId,
+      detailNodeId: detail?.nodeId,
+      hasDetail: Boolean(detail),
+    })
+  ) {
     delete targetWindow.__canvasAgentPendingAnnotationEditRequest;
   }
   return pending;
diff --git a/tests/routes/canvas-chat-helpers.test.ts b/tests/routes/canvas-chat-helpers.test.ts
index c74c5f753..64b01834a 100644
--- a/tests/routes/canvas-chat-helpers.test.ts
+++ b/tests/routes/canvas-chat-helpers.test.ts
@@ -3706,6 +3706,29 @@ test.describe("canvas chat pure helpers", () => {
     expect(getPendingCanvasAgentAnnotationEditRequest(targetWindow)).toBeNull();
   });
 
+  test("consumes pending canvas agent UI requests when no event detail is provided", () => {
+    const targetWindow = {} as CanvasAgentPendingRequestWindow;
+    const slotRequest = {
+      nodeId: "slot-1",
+      label: "主图槽",
+    };
+    const annotationRequest = {
+      nodeId: "image-annotated",
+      title: "白底主图",
+      annotationCount: 2,
+    };
+
+    storeCanvasAgentSlotFillRequest(targetWindow, slotRequest);
+    storeCanvasAgentAnnotationEditRequest(targetWindow, annotationRequest);
+
+    expect(consumeCanvasAgentSlotFillRequest(targetWindow)).toEqual(slotRequest);
+    expect(consumeCanvasAgentAnnotationEditRequest(targetWindow)).toEqual(
+      annotationRequest
+    );
+    expect(getPendingCanvasAgentSlotFillRequest(targetWindow)).toBeNull();
+    expect(getPendingCanvasAgentAnnotationEditRequest(targetWindow)).toBeNull();
+  });
+
   test("keeps pending annotation edit targets eligible for the next canvas context", () => {
     const nodes = [
       {