From 98d521d01a838d6de2851f36c5e3429052ecacd1 Mon Sep 17 00:00:00 2001
From: Trevor Edwards <9443483+trevoedwards@users.noreply.github.com>
Date: Wed, 4 Nov 2026 04:35:29 +0000
Subject: [PATCH] fix(cursor): preserve recognized transport failure
 diagnostics

---
 packages/provider-cursor/src/server/adapter.test.ts | 5 ++++-
 packages/provider-cursor/src/server/adapter.ts      | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/provider-cursor/src/server/adapter.test.ts b/packages/provider-cursor/src/server/adapter.test.ts
index 69fa9cd63a800..04582be1e84fe 100644
--- a/packages/provider-cursor/src/server/adapter.test.ts
+++ b/packages/provider-cursor/src/server/adapter.test.ts
@@ -336,7 +336,10 @@ 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 e5b77e1041d4a..6d64b6a34ec33 100644
--- a/packages/provider-cursor/src/server/adapter.ts
+++ b/packages/provider-cursor/src/server/adapter.ts
@@ -2527,7 +2527,7 @@ export const makeCursorAdapterV2 = Effect.fn("makeCursorAdapterV2")(function* (
                                       : "provider_error",
                                   })
                                 : makeProviderFailure({
-                                    cause: transportFailure,
+                                    message: transportFailure,
                                     class: "transport_error",
                                   }),
                           }