diff --git a/crates/workspace-server/src/server.rs b/crates/workspace-server/src/server.rs
index 5622d6d9..32048e0b 100644
--- a/crates/workspace-server/src/server.rs
+++ b/crates/workspace-server/src/server.rs
@@ -13574,6 +13574,7 @@ impl IntoResponse for ApiError {
                     || code.starts_with("unsupported_worker_profile")
                     || code.starts_with("working_directory_")
                     || code.starts_with("workspace_cleanup_")
+                    || code == "default_runtime_not_configured"
                     || code == "workspace_worker_workdir_required"
                     || code.ends_with("_already_exists")
                     || code.ends_with("_not_config_managed")
@@ -18989,6 +18990,17 @@ mod tests {
         (runtime, worker.worker_ref)
     }
 
+    #[test]
+    fn default_runtime_not_configured_operation_error_maps_to_bad_request() {
+        let response = ApiError::from(Error::RuntimeOperationFailed {
+            runtime_id: "workspace-config".to_string(),
+            code: "default_runtime_not_configured".to_string(),
+            message: "Workspace default Runtime is not configured".to_string(),
+        })
+        .into_response();
+        assert_eq!(response.status(), StatusCode::BAD_REQUEST);
+    }
+
     #[tokio::test]
     async fn browser_workspace_workdir_create_requires_configured_default_runtime() {
         let dir = tempfile::tempdir().unwrap();