diff --git a/crates/tools/src/lib.rs b/crates/tools/src/lib.rs
index c848d5e7..64406154 100644
--- a/crates/tools/src/lib.rs
+++ b/crates/tools/src/lib.rs
@@ -560,6 +560,12 @@ mod tests {
         );
     }
 
+    #[test]
+    fn tool_error_missing_field_constructor() {
+        let err = ToolError::missing_field("my_field");
+        assert!(matches!(err, ToolError::MissingField { field } if field == "my_field"));
+    }
+
     #[test]
     fn tool_error_invalid_input_creates_correct_variant() {
         let err = ToolError::invalid_input("test invalid message");