diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 0791684c2..2131655fe 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -3014,6 +3014,7 @@ export async function POST(request: Request) {
             projectId,
             operationId,
             mutationOperation: operation,
+            sourceNodeIds: plan.sourceNodeIds,
             createdNodeIds: result.createdNodeIds,
             updatedNodeIds: result.updatedNodeIds,
             anchorNodeId: result.createdNodeIds[0] || result.updatedNodeIds[0] || null,
diff --git a/lib/canvas/agent-result-view.ts b/lib/canvas/agent-result-view.ts
index 2e060a3be..0a0581f39 100644
--- a/lib/canvas/agent-result-view.ts
+++ b/lib/canvas/agent-result-view.ts
@@ -17,6 +17,7 @@ export function buildCanvasAgentResultViewOperation(params: {
   projectId?: string | null;
   operationId: string;
   mutationOperation?: CanvasOperationKind;
+  sourceNodeIds?: string[];
   createdNodeIds?: string[];
   updatedNodeIds?: string[];
   anchorNodeId?: string | null;
@@ -29,17 +30,34 @@ export function buildCanvasAgentResultViewOperation(params: {
   if (!projectId || !operationId) return null;
 
   const createdNodeIds = normalizeNodeIds(params.createdNodeIds);
-  const updatedNodeIds = normalizeNodeIds(params.updatedNodeIds).filter(
+  const sourceNodeIds = normalizeNodeIds(params.sourceNodeIds).filter(
     (nodeId) => !createdNodeIds.includes(nodeId)
   );
-  const nodeIds = createdNodeIds.length > 0 ? createdNodeIds : updatedNodeIds;
+  const updatedNodeIds = normalizeNodeIds(params.updatedNodeIds).filter(
+    (nodeId) => !createdNodeIds.includes(nodeId) && !sourceNodeIds.includes(nodeId)
+  );
+  const hasCreatedResult = createdNodeIds.length > 0;
+  const comparisonNodeIds =
+    hasCreatedResult && sourceNodeIds.length > 0
+      ? [...sourceNodeIds, ...createdNodeIds]
+      : [];
+  const nodeIds =
+    comparisonNodeIds.length > 0
+      ? comparisonNodeIds
+      : createdNodeIds.length > 0
+        ? createdNodeIds
+        : updatedNodeIds;
   if (nodeIds.length === 0) return null;
 
   const requestedAnchorNodeId = String(params.anchorNodeId || "").trim();
-  const anchorNodeId = nodeIds.includes(requestedAnchorNodeId)
-    ? requestedAnchorNodeId
-    : nodeIds[0];
-  const hasCreatedResult = createdNodeIds.length > 0;
+  const anchorNodeId =
+    comparisonNodeIds.length > 0
+      ? sourceNodeIds.includes(requestedAnchorNodeId)
+        ? requestedAnchorNodeId
+        : sourceNodeIds[0]
+      : nodeIds.includes(requestedAnchorNodeId)
+        ? requestedAnchorNodeId
+        : nodeIds[0];
   const operation =
     nodeIds.length > 1
       ? "focus_nodes"
@@ -61,6 +79,8 @@ export function buildCanvasAgentResultViewOperation(params: {
       params.reason ||
       (params.mutationOperation === "replace_node_media"
         ? "focus_canvas_agent_replaced_nodes"
+        : comparisonNodeIds.length > 0
+          ? "focus_canvas_agent_writeback_comparison"
         : hasCreatedResult
           ? "focus_canvas_agent_writeback_result"
           : "focus_canvas_agent_updated_nodes"),
diff --git a/tests/routes/canvas-chat-helpers.test.ts b/tests/routes/canvas-chat-helpers.test.ts
index 5bf78b524..d3f5beb7a 100644
--- a/tests/routes/canvas-chat-helpers.test.ts
+++ b/tests/routes/canvas-chat-helpers.test.ts
@@ -2113,6 +2113,22 @@ test.describe("canvas chat pure helpers", () => {
       anchorNodeId: "new-image-1",
     });
 
+    expect(
+      buildCanvasAgentResultViewOperation({
+        projectId: plannerContext.projectId,
+        operationId: "operation-compare",
+        mutationOperation: "append_revision",
+        sourceNodeIds: ["image-1", " image-1 "],
+        createdNodeIds: ["new-image-1"],
+        anchorNodeId: "new-image-1",
+      })
+    ).toMatchObject({
+      operation: "focus_nodes",
+      nodeIds: ["image-1", "new-image-1"],
+      anchorNodeId: "image-1",
+      reason: "focus_canvas_agent_writeback_comparison",
+    });
+
     expect(
       buildCanvasAgentResultViewOperation({
         projectId: plannerContext.projectId,