diff --git a/tests/routes/canvas-agent-operations.test.ts b/tests/routes/canvas-agent-operations.test.ts
index cf227d1a2..db00ff0e1 100644
--- a/tests/routes/canvas-agent-operations.test.ts
+++ b/tests/routes/canvas-agent-operations.test.ts
@@ -1003,4 +1003,128 @@ test.describe("canvas agent operation mutation contract", () => {
       "STALE_CANVAS_REVISION"
     );
   });
+
+  test("confirms delete-node mutations, removes connected edges, and keeps retries idempotent", () => {
+    const source = buildImageNode("image-source");
+    const target = buildImageNode("image-delete");
+    const unrelated = buildImageNode("image-unrelated");
+    const edge = {
+      id: "edge-source-delete",
+      source: "image-source",
+      target: "image-delete",
+      type: "reference",
+      createdAt: "2026-06-22T00:00:00.000Z",
+    };
+    const canvasData = {
+      ...getCanvasData([source, target, unrelated]),
+      edges: [edge],
+      selectedNodeIds: ["image-delete"],
+    };
+    const plan: CanvasOperationPlan = {
+      version: 1,
+      operationId: "op-delete-node",
+      operation: "delete_nodes",
+      projectId,
+      targetNodeIds: ["image-delete"],
+      metadata: {
+        messageId: "assistant-message-delete",
+        chatId: "chat-1",
+      },
+    };
+
+    expect(() =>
+      applyCanvasOperationPlanToCanvasData({
+        canvasData,
+        plan,
+      })
+    ).toThrow(/需要用户确认/);
+
+    const deleted = applyCanvasOperationPlanToCanvasData({
+      canvasData,
+      plan: {
+        ...plan,
+        confirmed: true,
+        metadata: {
+          ...plan.metadata,
+          confirmedByUser: true,
+        },
+      },
+    });
+    const deletedCanvasData = deleted.canvasData as {
+      nodes?: any[];
+      edges?: any[];
+      selectedNodeIds?: string[];
+      metadata?: Record<string, any>;
+    };
+
+    expect(deleted.createdNodeIds).toEqual([]);
+    expect(deleted.updatedNodeIds).toEqual(["image-delete"]);
+    expect(deletedCanvasData.nodes?.map((node) => node.id).sort()).toEqual([
+      "image-source",
+      "image-unrelated",
+    ]);
+    expect(deletedCanvasData.edges).toEqual([]);
+    expect(deletedCanvasData.selectedNodeIds).toEqual([]);
+    expect(
+      deletedCanvasData.nodes?.find((node) => node.id === "image-source")?.connections
+    ).toEqual([]);
+    expect(deletedCanvasData.metadata?.canvasAgentOperationAudit).toEqual([
+      expect.objectContaining({
+        operationId: "op-delete-node",
+        operation: "delete_nodes",
+        targetNodeIds: ["image-delete"],
+        deletedNodeIds: ["image-delete"],
+        deletedEdges: [edge],
+        metadata: expect.objectContaining({
+          confirmedByUser: true,
+        }),
+      }),
+    ]);
+
+    const retry = applyCanvasOperationPlanToCanvasData({
+      canvasData: deleted.canvasData,
+      plan: {
+        ...plan,
+        confirmed: true,
+        metadata: {
+          ...plan.metadata,
+          confirmedByUser: true,
+        },
+      },
+    });
+
+    expect(retry.updatedNodeIds).toEqual(["image-delete"]);
+    expect(getResultNodes(retry.canvasData)).toHaveLength(2);
+    expect(getResultEdges(retry.canvasData)).toEqual([]);
+  });
+
+  test("rejects confirmed stale delete-node mutations", () => {
+    const target = buildImageNode("image-stale-delete");
+
+    let caughtError: unknown;
+    try {
+      applyCanvasOperationPlanToCanvasData({
+        canvasData: getCanvasData([target]),
+        baseCanvasWasStale: true,
+        plan: {
+          version: 1,
+          operationId: "op-stale-delete-node",
+          operation: "delete_nodes",
+          projectId,
+          targetNodeIds: ["image-stale-delete"],
+          confirmed: true,
+          metadata: {
+            confirmedByUser: true,
+          },
+        },
+      });
+    } catch (error) {
+      caughtError = error;
+    }
+
+    expect(caughtError).toBeInstanceOf(CanvasAgentMutationError);
+    expect((caughtError as CanvasAgentMutationError).code).toBe(
+      "STALE_CANVAS_REVISION"
+    );
+  });
 });