diff --git a/.github/sonar-fix-config.yml b/.github/sonar-fix-config.yml
index 5f33c7c..a8770be 100644
--- a/.github/sonar-fix-config.yml
+++ b/.github/sonar-fix-config.yml
@@ -1,4 +1,4 @@
 # Per-repo override: route to Codex instead of the central default's Claude.
 # Everything else (severities, rules allow/deny, etc.) inherits from
 # config/default.yml in the central sonar-fix repo at run time.
-agent: codex
+agent: copilot
diff --git a/src/main/java/clipper2/SonarFixProbeV1Copilot4.java b/src/main/java/clipper2/SonarFixProbeV1Copilot4.java
new file mode 100644
index 0000000..a36dc71
--- /dev/null
+++ b/src/main/java/clipper2/SonarFixProbeV1Copilot4.java
@@ -0,0 +1,7 @@
+package clipper2;
+
+public class SonarFixProbeV1Copilot4 {
+    public void run() {
+        // intentionally empty - probe class has no behaviour to implement
+    }
+}