diff --git a/src/media-understanding/providers/deepgram/audio.ts b/src/media-understanding/providers/deepgram/audio.ts
index 35965459fec..b32f18c870a 100644
--- a/src/media-understanding/providers/deepgram/audio.ts
+++ b/src/media-understanding/providers/deepgram/audio.ts
@@ -1,5 +1,5 @@
 import type { AudioTranscriptionRequest, AudioTranscriptionResult } from "../../types.js";
-import { fetchWithTimeoutGuarded, normalizeBaseUrl, readErrorResponse } from "../shared.js";
+import { assertOkOrThrowHttpError, fetchWithTimeoutGuarded, normalizeBaseUrl } from "../shared.js";
 
 export const DEFAULT_DEEPGRAM_AUDIO_BASE_URL = "https://api.deepgram.com/v1";
 export const DEFAULT_DEEPGRAM_AUDIO_MODEL = "nova-3";
@@ -63,11 +63,7 @@ export async function transcribeDeepgramAudio(
   );
 
   try {
-    if (!res.ok) {
-      const detail = await readErrorResponse(res);
-      const suffix = detail ? `: ${detail}` : "";
-      throw new Error(`Audio transcription failed (HTTP ${res.status})${suffix}`);
-    }
+    await assertOkOrThrowHttpError(res, "Audio transcription failed");
 
     const payload = (await res.json()) as DeepgramTranscriptResponse;
     const transcript = payload.results?.channels?.[0]?.alternatives?.[0]?.transcript?.trim();
diff --git a/src/media-understanding/providers/google/inline-data.ts b/src/media-understanding/providers/google/inline-data.ts
index 4f5df896a0a..39c1093644a 100644
--- a/src/media-understanding/providers/google/inline-data.ts
+++ b/src/media-understanding/providers/google/inline-data.ts
@@ -1,5 +1,5 @@
 import { normalizeGoogleModelId } from "../../../agents/models-config.providers.js";
-import { fetchWithTimeoutGuarded, normalizeBaseUrl, readErrorResponse } from "../shared.js";
+import { assertOkOrThrowHttpError, fetchWithTimeoutGuarded, normalizeBaseUrl } from "../shared.js";
 
 export async function generateGeminiInlineDataText(params: {
   buffer: Buffer;
@@ -73,11 +73,7 @@ export async function generateGeminiInlineDataText(params: {
   );
 
   try {
-    if (!res.ok) {
-      const detail = await readErrorResponse(res);
-      const suffix = detail ? `: ${detail}` : "";
-      throw new Error(`${params.httpErrorLabel} (HTTP ${res.status})${suffix}`);
-    }
+    await assertOkOrThrowHttpError(res, params.httpErrorLabel);
 
     const payload = (await res.json()) as {
       candidates?: Array<{
diff --git a/src/media-understanding/providers/openai/audio.ts b/src/media-understanding/providers/openai/audio.ts
index bfd87009909..2635ad23d0b 100644
--- a/src/media-understanding/providers/openai/audio.ts
+++ b/src/media-understanding/providers/openai/audio.ts
@@ -1,6 +1,6 @@
 import path from "node:path";
 import type { AudioTranscriptionRequest, AudioTranscriptionResult } from "../../types.js";
-import { fetchWithTimeoutGuarded, normalizeBaseUrl, readErrorResponse } from "../shared.js";
+import { assertOkOrThrowHttpError, fetchWithTimeoutGuarded, normalizeBaseUrl } from "../shared.js";
 
 export const DEFAULT_OPENAI_AUDIO_BASE_URL = "https://api.openai.com/v1";
 const DEFAULT_OPENAI_AUDIO_MODEL = "gpt-4o-mini-transcribe";
@@ -52,11 +52,7 @@ export async function transcribeOpenAiCompatibleAudio(
   );
 
   try {
-    if (!res.ok) {
-      const detail = await readErrorResponse(res);
-      const suffix = detail ? `: ${detail}` : "";
-      throw new Error(`Audio transcription failed (HTTP ${res.status})${suffix}`);
-    }
+    await assertOkOrThrowHttpError(res, "Audio transcription failed");
 
     const payload = (await res.json()) as { text?: string };
     const text = payload.text?.trim();
diff --git a/src/media-understanding/providers/shared.ts b/src/media-understanding/providers/shared.ts
index 3e9a9ee7d93..beaafcf9e51 100644
--- a/src/media-understanding/providers/shared.ts
+++ b/src/media-understanding/providers/shared.ts
@@ -47,3 +47,12 @@ export async function readErrorResponse(res: Response): Promise<string | undefin
     return undefined;
   }
 }
+
+export async function assertOkOrThrowHttpError(res: Response, label: string): Promise<void> {
+  if (res.ok) {
+    return;
+  }
+  const detail = await readErrorResponse(res);
+  const suffix = detail ? `: ${detail}` : "";
+  throw new Error(`${label} (HTTP ${res.status})${suffix}`);
+}