diff --git a/crates/worker/tests/session_metrics_test.rs b/crates/worker/tests/session_metrics_test.rs
index 53222f1b..11e46dcc 100644
--- a/crates/worker/tests/session_metrics_test.rs
+++ b/crates/worker/tests/session_metrics_test.rs
@@ -87,6 +87,7 @@ impl Tool for BigContentTool {
         Ok(ToolOutput {
             summary: self.summary.into(),
             content: Some(self.content.clone()),
+            attachments: Vec::new(),
         })
     }
 }