diff --git a/apps/server/src/provider/Drivers/CodexHomeLayout.test.ts b/apps/server/src/provider/Drivers/CodexHomeLayout.test.ts
index 2bbcea20faa91..fe1d4cfc25275 100644
--- a/apps/server/src/provider/Drivers/CodexHomeLayout.test.ts
+++ b/apps/server/src/provider/Drivers/CodexHomeLayout.test.ts
@@ -165,6 +165,66 @@ it.layer(NodeServices.layer)("CodexHomeLayout", (it) => {
         }),
     );
 
+    it.effect.skipIf(!symlinksSupported)(
+      "keeps a shadow home's own cloud config bundle cache",
+      () =>
+        Effect.gen(function* () {
+          const fileSystem = yield* FileSystem.FileSystem;
+          const path = yield* Path.Path;
+          const sharedHome = yield* makeTempDir("t3code-codex-shared-");
+          const shadowHome = yield* makeTempDir("t3code-codex-shadow-");
+          const shadowCache = path.join(shadowHome, "cloud-config-bundle-cache.json");
+
+          yield* writeTextFile(
+            path.join(sharedHome, "cloud-config-bundle-cache.json"),
+            '{"account_id":"shared"}\n',
+          );
+          yield* writeTextFile(shadowCache, '{"account_id":"shadow"}\n');
+          const layout = yield* resolveCodexHomeLayout(
+            decodeCodexSettings({ homePath: sharedHome, shadowHomePath: shadowHome }),
+          );
+
+          yield* materializeCodexShadowHome(layout);
+
+          expect(yield* fileSystem.readFileString(shadowCache)).toBe('{"account_id":"shadow"}\n');
+        }),
+    );
+
+    it.effect.skipIf(!symlinksSupported)(
+      "does not share the cloud config bundle cache with shadow homes",
+      () =>
+        Effect.gen(function* () {
+          const fileSystem = yield* FileSystem.FileSystem;
+          const path = yield* Path.Path;
+          const sharedHome = yield* makeTempDir("t3code-codex-shared-");
+          const freshShadowHome = yield* makeTempDir("t3code-codex-shadow-");
+          const linkedShadowHome = yield* makeTempDir("t3code-codex-shadow-");
+          const sharedCache = path.join(sharedHome, "cloud-config-bundle-cache.json");
+
+          yield* writeTextFile(sharedCache, '{"account_id":"shared"}\n');
+          yield* fileSystem.symlink(
+            sharedCache,
+            path.join(linkedShadowHome, "cloud-config-bundle-cache.json"),
+          );
+
+          for (const shadowHome of [freshShadowHome, linkedShadowHome]) {
+            yield* materializeCodexShadowHome(
+              yield* resolveCodexHomeLayout(
+                decodeCodexSettings({ homePath: sharedHome, shadowHomePath: shadowHome }),
+              ),
+            );
+          }
+
+          expect(
+            yield* fileSystem.exists(path.join(freshShadowHome, "cloud-config-bundle-cache.json")),
+          ).toBe(false);
+          expect(
+            yield* fileSystem.exists(path.join(linkedShadowHome, "cloud-config-bundle-cache.json")),
+          ).toBe(false);
+          expect(yield* fileSystem.readFileString(sharedCache)).toBe('{"account_id":"shared"}\n');
+        }),
+    );
+
     it.effect.skipIf(!symlinksSupported)(
       "replaces a Codex-created local sqlite maintenance lock with the shared lock",
       () =>
diff --git a/apps/server/src/provider/Drivers/CodexHomeLayout.ts b/apps/server/src/provider/Drivers/CodexHomeLayout.ts
index f6d2ba9d44cf5..7cc7b94521da6 100644
--- a/apps/server/src/provider/Drivers/CodexHomeLayout.ts
+++ b/apps/server/src/provider/Drivers/CodexHomeLayout.ts
@@ -30,7 +30,12 @@ const KNOWN_SHARED_DIRECTORIES = [
 ] as const;
 
 // auth.lock guards the shadow home's private auth.json.
-const PRIVATE_ENTRY_NAMES = new Set(["auth.json", "auth.lock", "models_cache.json"]);
+const PRIVATE_ENTRY_NAMES = new Set([
+  "auth.json",
+  "auth.lock",
+  "models_cache.json",
+  "cloud-config-bundle-cache.json",
+]);
 // Finder maintains metadata separately for each directory, including shadow homes.
 const SHADOW_LOCAL_ENTRY_NAMES = new Set(["log", "memories", "tmp", ".DS_Store"]);
 // Shadow homes may create local runtime locks first; replace them with shared links because they guard shared state.