diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index f3fb7368d..5da77bed6 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -332,6 +332,10 @@ const requiredMobileShellScriptModules = [
   'check-expo-config.mjs',
   'check-expo-export.mjs',
 ];
+const productionSourceExcludedDirectories = new Set([
+  'node_modules',
+  'test-utils',
+]);
 const devScaffoldTerms = [
   'mo' + 'ck',
   'fa' + 'ke',
@@ -649,6 +653,11 @@ function collectProductionSourceFiles(entry) {
     const directory = entry.href.endsWith('/') ? entry : new URL(`${entry.href}/`);
     return fs
       .readdirSync(entry, { withFileTypes: true })
+      .filter(
+        (child) =>
+          !child.isDirectory() ||
+          !productionSourceExcludedDirectories.has(child.name),
+      )
       .flatMap((child) =>
         collectProductionSourceFiles(
           new URL(`${child.name}${child.isDirectory() ? '/' : ''}`, directory),
@@ -806,6 +815,14 @@ for (const snippet of [
   }
 }
 
+for (const excludedDirectory of productionSourceExcludedDirectories) {
+  if (!nativeShellCheckSource.includes(`'${excludedDirectory}'`)) {
+    throw new Error(
+      `root native shell check is missing mobile source exclusion: ${excludedDirectory}`,
+    );
+  }
+}
+
 assertNoDevScaffoldTerms(
   productionSourceRoots.flatMap((root) => collectProductionSourceFiles(root)),
 );