diff --git a/crates/grokboy-core/src/agent.rs b/crates/grokboy-core/src/agent.rs
index 09775d3..258263a 100644
--- a/crates/grokboy-core/src/agent.rs
+++ b/crates/grokboy-core/src/agent.rs
@@ -640,6 +640,7 @@ mod tests {
         let _ = &s2[..end];
     }
 
+    #[test]
     fn truncate_keeps_system_and_shrinks_old_tools() {
         let mut msgs = vec![
             ChatMessage::system("sys"),