From 601be56b98baecc7fac1d2df213ac5bf9bffb018 Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Thu, 9 Jul 2026 13:30:16 -0400
Subject: [PATCH] test(llm): reproduce nested OpenAI stream error loss

---
 .../test/provider/openai-responses.test.ts    | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/packages/llm/test/provider/openai-responses.test.ts b/packages/llm/test/provider/openai-responses.test.ts
index 3d048d4eee..dd60146128 100644
--- a/packages/llm/test/provider/openai-responses.test.ts
+++ b/packages/llm/test/provider/openai-responses.test.ts
@@ -1471,6 +1471,29 @@ describe("OpenAI Responses route", () => {
     }),
   )
 
+  it.effect("surfaces error event details nested under a top-level error field", () =>
+    Effect.gen(function* () {
+      const response = yield* LLMClient.generate(request).pipe(
+        Effect.provide(
+          fixedResponse(
+            sseEvents({
+              type: "error",
+              error: { code: "context_length_exceeded", message: "prompt too long" },
+            }),
+          ),
+        ),
+      )
+
+      expect(response.events).toEqual([
+        {
+          type: "provider-error",
+          message: "context_length_exceeded: prompt too long",
+          classification: "context-overflow",
+        },
+      ])
+    }),
+  )
+
   it.effect("falls back to a stable default when both error and response are absent", () =>
     Effect.gen(function* () {
       const response = yield* LLMClient.generate(request).pipe(