diff --git a/src/media-understanding/fs.ts b/src/media-understanding/fs.ts
new file mode 100644
index 00000000000..3bea43d0536
--- /dev/null
+++ b/src/media-understanding/fs.ts
@@ -0,0 +1,13 @@
+import fs from "node:fs/promises";
+
+export async function fileExists(filePath?: string | null): Promise<boolean> {
+  if (!filePath) {
+    return false;
+  }
+  try {
+    await fs.stat(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
diff --git a/src/media-understanding/runner.entries.ts b/src/media-understanding/runner.entries.ts
index b40e16fa531..e1f74bef8bb 100644
--- a/src/media-understanding/runner.entries.ts
+++ b/src/media-understanding/runner.entries.ts
@@ -25,6 +25,7 @@ import {
   DEFAULT_TIMEOUT_SECONDS,
 } from "./defaults.js";
 import { MediaUnderstandingSkipError } from "./errors.js";
+import { fileExists } from "./fs.js";
 import { extractGeminiResponse } from "./output-extract.js";
 import { describeImageWithModel } from "./providers/image.js";
 import { getMediaUnderstandingProvider, normalizeMediaProviderId } from "./providers/index.js";
@@ -129,18 +130,6 @@ function resolveWhisperCppOutputPath(args: string[]): string | null {
   return `${outputBase}.txt`;
 }
 
-async function fileExists(filePath?: string | null): Promise<boolean> {
-  if (!filePath) {
-    return false;
-  }
-  try {
-    await fs.stat(filePath);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 async function resolveCliOutput(params: {
   command: string;
   args: string[];
diff --git a/src/media-understanding/runner.ts b/src/media-understanding/runner.ts
index 8dd7e2f979a..2ca1ce654fe 100644
--- a/src/media-understanding/runner.ts
+++ b/src/media-understanding/runner.ts
@@ -32,6 +32,7 @@ import {
   DEFAULT_IMAGE_MODELS,
 } from "./defaults.js";
 import { isMediaUnderstandingSkipError } from "./errors.js";
+import { fileExists } from "./fs.js";
 import { extractGeminiResponse } from "./output-extract.js";
 import {
   buildMediaUnderstandingRegistry,
@@ -175,18 +176,6 @@ async function hasBinary(name: string): Promise<boolean> {
   return Boolean(await findBinary(name));
 }
 
-async function fileExists(filePath?: string | null): Promise<boolean> {
-  if (!filePath) {
-    return false;
-  }
-  try {
-    await fs.stat(filePath);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 async function probeGeminiCli(): Promise<boolean> {
   const cached = geminiProbeCache.get("gemini");
   if (cached) {