diff --git a/packages/mosaic/src/mutator-gate/runtime_tools_unittest.py b/packages/mosaic/src/mutator-gate/runtime_tools_unittest.py
index 8dcaa8b..e809802 100644
--- a/packages/mosaic/src/mutator-gate/runtime_tools_unittest.py
+++ b/packages/mosaic/src/mutator-gate/runtime_tools_unittest.py
@@ -100,6 +100,31 @@ class LaunchRuntimeTest(unittest.TestCase):
         self.assertEqual(environment["MOSAIC_LEASE_RUNTIME"], "claude")
         self.assertEqual(environment["PRESERVED"], "yes")
 
+    def test_dangerous_claude_mode_is_owned_and_injected_by_the_wrapper(self) -> None:
+        executed: list[tuple[str, list[str], dict[str, str]]] = []
+        result = LAUNCHER.main(
+            ["--runtime", "claude", "--dangerous", "--", "claude", "-p", "hello"],
+            environ={"MOSAIC_LEASE_BROKER_SOCKET": "/broker"},
+            request=lambda *_args: {"ok": True, "session_id": "e" * 64},
+            execute=lambda *args: executed.append(args),
+        )
+        self.assertEqual(result, 0)
+        self.assertEqual(
+            executed[0][1],
+            ["claude", "--dangerously-skip-permissions", "-p", "hello"],
+        )
+
+        with redirect_stderr(io.StringIO()):
+            self.assertEqual(
+                LAUNCHER.main(
+                    ["--runtime", "pi", "--dangerous", "--", "pi"],
+                    environ={"MOSAIC_LEASE_BROKER_SOCKET": "/broker"},
+                    request=lambda *_args: {"ok": True, "session_id": "e" * 64},
+                    execute=lambda *_args: self.fail("invalid dangerous runtime executed"),
+                ),
+                64,
+            )
+
     def test_command_without_separator_is_forwarded_unchanged(self) -> None:
         executed: list[tuple[str, list[str], dict[str, str]]] = []
         result = LAUNCHER.main(