diff --git a/src/OpenClaw.Shared/Capabilities/CanvasCapability.cs b/src/OpenClaw.Shared/Capabilities/CanvasCapability.cs
index 8b9c02458..7999bafce 100644
--- a/src/OpenClaw.Shared/Capabilities/CanvasCapability.cs
+++ b/src/OpenClaw.Shared/Capabilities/CanvasCapability.cs
@@ -298,7 +298,7 @@ private NodeInvokeResponse HandleA2UIPush(NodeInvokeRequest request)
             catch (Exception ex)
             {
                 Logger.Error($"{request.Command}: failed to read jsonlPath", ex);
-                return Error($"Failed to read jsonlPath: {ex.Message}");
+                return Error("Failed to read jsonlPath");
             }
         }
 
diff --git a/tests/OpenClaw.Shared.Tests/A2UICapabilitySecurityTests.cs b/tests/OpenClaw.Shared.Tests/A2UICapabilitySecurityTests.cs
index a435677b8..4438f41e2 100644
--- a/tests/OpenClaw.Shared.Tests/A2UICapabilitySecurityTests.cs
+++ b/tests/OpenClaw.Shared.Tests/A2UICapabilitySecurityTests.cs
@@ -74,7 +74,7 @@ public async Task A2UIPush_FileJsonl_OverCap_ReturnsError()
             };
             var res = await cap.ExecuteAsync(req);
             Assert.False(res.Ok);
-            Assert.Contains("maximum size", res.Error);
+            Assert.Equal("Failed to read jsonlPath", res.Error);
         }
         finally
         {
@@ -125,7 +125,7 @@ public async Task A2UIPush_FileJsonl_SymlinkOutsideTemp_ReturnsError()
             var res = await cap.ExecuteAsync(req);
 
             Assert.False(res.Ok);
-            Assert.Contains("temp", res.Error, StringComparison.OrdinalIgnoreCase);
+            Assert.Equal("Failed to read jsonlPath", res.Error);
         }
         finally
         {
diff --git a/tests/OpenClaw.Shared.Tests/CapabilityTests.cs b/tests/OpenClaw.Shared.Tests/CapabilityTests.cs
index 93cb488c0..1c0d40021 100644
--- a/tests/OpenClaw.Shared.Tests/CapabilityTests.cs
+++ b/tests/OpenClaw.Shared.Tests/CapabilityTests.cs
@@ -1489,7 +1489,7 @@ public async Task A2UIPush_WithJsonlPathOutsideTempDir_ReturnsError()
         };
         var res = await cap.ExecuteAsync(req);
         Assert.False(res.Ok);
-        Assert.Contains("temp directory", res.Error);
+        Assert.Equal("Failed to read jsonlPath", res.Error);
     }
     
     [Fact]
@@ -1506,7 +1506,7 @@ public async Task A2UIPush_WithJsonlPathTraversal_ReturnsError()
         };
         var res = await cap.ExecuteAsync(req);
         Assert.False(res.Ok);
-        Assert.Contains("temp directory", res.Error);
+        Assert.Equal("Failed to read jsonlPath", res.Error);
     }
 
     [Fact]