diff --git a/src/createApp.tsx b/src/createApp.tsx
index 0a26382..3aa8a58 100644
--- a/src/createApp.tsx
+++ b/src/createApp.tsx
@@ -240,8 +240,8 @@ export async function createReactApp(config: AppConfig): Promise<BootstrapResult
   // Dev tools initialization (dev-only)
   // - DevContentOverlay: WYSIWYG content editor with plugin system
   // - DeveloperFAB: Floating action button for dev tools (includes content editor toggle)
-  const disableContentOverlay = devTools?.disableContentOverlay ?? false;
-  const disableDeveloperFab = devTools?.disableDeveloperFab ?? false;
+  const disableContentOverlay = devTools?.disableContentOverlay ?? true;
+  const disableDeveloperFab = devTools?.disableDeveloperFab ?? true;
 
   // Skip dev tools injection if both are disabled
   if (disableContentOverlay && disableDeveloperFab) {
diff --git a/src/types.ts b/src/types.ts
index 5dc007c..771e92d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -116,9 +116,9 @@ export interface DevToolsConfig {
   reactQueryDevTools?: boolean;
   /** Enable user switcher for testing */
   userSwitcher?: boolean;
-  /** Disable auto-injection of DevContentOverlay. Default: false (auto-inject in dev) */
+  /** Disable auto-injection of DevContentOverlay. Default: true (opt-in only) */
   disableContentOverlay?: boolean;
-  /** Disable auto-injection of DeveloperFab. Default: false (auto-inject in dev) */
+  /** Disable auto-injection of DeveloperFab. Default: true (opt-in only) */
   disableDeveloperFab?: boolean;
 }