diff --git a/tests/support/test_channel.rs b/tests/support/test_channel.rs
index a5cb239f5..bef4b89a4 100644
--- a/tests/support/test_channel.rs
+++ b/tests/support/test_channel.rs
@@ -3,7 +3,10 @@
 //! Injects messages into the agent loop via an mpsc sender and captures
 //! responses and status events for assertion in tests.
 
-#![allow(dead_code)] // Public API consumed by later test modules (Task 3+).
+#![expect(
+    dead_code,
+    reason = "test scaffolding exposes helpers consumed by selected integration test modules"
+)]
 
 use std::collections::HashMap;
 use std::sync::Arc;