diff --git a/backend-tests/ToxiproxyAgentProvisioningIntegrationTests.cs b/backend-tests/ToxiproxyAgentProvisioningIntegrationTests.cs
index 326ab83..9862405 100644
--- a/backend-tests/ToxiproxyAgentProvisioningIntegrationTests.cs
+++ b/backend-tests/ToxiproxyAgentProvisioningIntegrationTests.cs
@@ -132,7 +132,8 @@ public sealed class ToxiproxyAgentProvisioningIntegrationTests
                 StringComparison.Ordinal),
             $"Expected ready after read-only reconciliation, got "
             + $"'{reconciled.Status}' ({reconciled.Error?.Code}: "
-            + $"{reconciled.Error?.Message}).");
+            + $"{reconciled.Error?.Message}). Last test inventory: "
+            + $"{gateway.LastAgentInventory ?? "<none>"}");
         Assert.Equal("release-analyst", reconciled.OpenClawAgentId);
         Assert.Equal(1, gateway.CreateCalls);
     }
@@ -229,8 +230,10 @@ internal sealed class ToxiproxyHttpGatewayConnector(Uri endpoint)
         BaseAddress = endpoint
     };
     private int createCalls;
+    private string? lastAgentInventory;
 
     public int CreateCalls => Volatile.Read(ref createCalls);
+    public string? LastAgentInventory => Volatile.Read(ref lastAgentInventory);
     public GatewayConnectionState ConnectionState => GatewayConnectionState.Connected;
     public string? GatewayVersion => "2026.7.1";
     public string? RequiredVersion => "2026.7.1";
@@ -304,9 +307,11 @@ internal sealed class ToxiproxyHttpGatewayConnector(Uri endpoint)
             using (response)
             {
                 response.EnsureSuccessStatusCode();
-                return JsonNode.Parse(
-                    await response.Content.ReadAsStringAsync(
-                        timeoutSource.Token));
+                var payload = await response.Content.ReadAsStringAsync(
+                    timeoutSource.Token);
+                if (method == "agents.list")
+                    Interlocked.Exchange(ref lastAgentInventory, payload);
+                return JsonNode.Parse(payload);
             }
         }
         catch (OperationCanceledException)