diff --git a/tests/AcDream.App.Tests/Diagnostics/ConnectedWorldSoakRouteContractTests.cs b/tests/AcDream.App.Tests/Diagnostics/ConnectedWorldSoakRouteContractTests.cs
index 76282efb..b6faeaf0 100644
--- a/tests/AcDream.App.Tests/Diagnostics/ConnectedWorldSoakRouteContractTests.cs
+++ b/tests/AcDream.App.Tests/Diagnostics/ConnectedWorldSoakRouteContractTests.cs
@@ -441,6 +441,43 @@ public sealed class ConnectedWorldSoakRouteContractTests
         Assert.Contains("$env:ACDREAM_DUMP_MOVE_TRUTH = '1'", source, StringComparison.Ordinal);
     }
 
+    [Fact]
+    public void MoveTruthGrepPatternIsBackedByALiveEmitter()
+    {
+        // #435/#437: the soak HARD-FAILS every destination when fewer than
+        // two fresh 'move-truth OUT' lines appear, and this env-var text
+        // assertion alone stayed green while the emitter was deleted — the
+        // script kept setting a flag nothing read. Tie BOTH ends together:
+        // the script must grep the pattern, and the client must still
+        // contain a reachable emitter producing it, gated on the option the
+        // script sets. Deleting either side now fails here instead of
+        // failing the next connected soak with a misleading message.
+        string script = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "tools",
+            "run-connected-r6-soak.ps1"));
+        Assert.Contains("'move-truth OUT'", script, StringComparison.Ordinal);
+
+        string emitter = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src", "AcDream.App", "Input",
+            "MovementTruthDiagnosticController.cs"));
+        Assert.Contains("move-truth OUT", emitter, StringComparison.Ordinal);
+
+        string options = File.ReadAllText(Path.Combine(
+            FindRepoRoot(), "src", "AcDream.App", "RuntimeOptions.cs"));
+        Assert.Contains(
+            @"env(""ACDREAM_DUMP_MOVE_TRUTH"")",
+            options,
+            StringComparison.Ordinal);
+        string window = File.ReadAllText(Path.Combine(
+            FindRepoRoot(), "src", "AcDream.App", "Rendering", "GameWindow.cs"));
+        Assert.Contains(
+            "options.DumpMoveTruth",
+            window,
+            StringComparison.Ordinal);
+    }
+
     [Fact]
     public void BaselineIdentityComesFromTheMeasuredBinaryRatherThanOnlyTheCheckout()
     {