diff --git a/packages/provider-cursor/src/server/adapter.test.ts b/packages/provider-cursor/src/server/adapter.test.ts
index 38c4119ad94ac..7749fce1a95b4 100644
--- a/packages/provider-cursor/src/server/adapter.test.ts
+++ b/packages/provider-cursor/src/server/adapter.test.ts
@@ -381,7 +381,10 @@ describe("CursorAdapterV2", () => {
         model: { id: "claude-fable-5" },
         durationMs: 1,
       }),
-      failure: { class: "transport_error", message: "Provider turn failed." },
+      failure: {
+        class: "transport_error",
+        message: "Error: RetriableError: WritableIterable is closed",
+      },
     },
     {
       reason: "no failure when Cursor's resume after the turn ended made no progress",
diff --git a/packages/provider-cursor/src/server/adapter.ts b/packages/provider-cursor/src/server/adapter.ts
index 496a2bd5460e8..9807179768304 100644
--- a/packages/provider-cursor/src/server/adapter.ts
+++ b/packages/provider-cursor/src/server/adapter.ts
@@ -2696,7 +2696,7 @@ export const makeCursorAdapterV2 = Effect.fn("makeCursorAdapterV2")(function* (
                                       : "provider_error",
                                   })
                                 : makeProviderFailure({
-                                    cause: transportFailure,
+                                    message: transportFailure,
                                     class: "transport_error",
                                   }),
                           }