diff --git a/app/src/utils/config.ts b/app/src/utils/config.ts
index f393f4728..5e26e1743 100644
--- a/app/src/utils/config.ts
+++ b/app/src/utils/config.ts
@@ -91,11 +91,13 @@ export const CONSUMER_FIRST_SESSION_ENABLED =
   import.meta.env.VITE_CONSUMER_FIRST_SESSION === 'true';
 
 /**
- * Chat multimodal attachments (image + supported file markers). Enabled by
- * default now that core parses `[IMAGE:…]` / `[FILE:…]` payloads and the
- * renderer runs a lossless compression pass before sending.
+ * Chat multimodal attachments (image + supported file markers). Disabled by
+ * default — the attach affordance is hidden and the file-picker path is gated
+ * off (a bare `<textarea>` already ignores pasted/dropped files). Opt back in
+ * for a build by setting `VITE_CHAT_ATTACHMENTS=true` (e.g. the e2e web build
+ * in `app/scripts/e2e-web-build.sh`, which exercises the attachment specs).
  */
-export const CHAT_ATTACHMENTS_ENABLED = import.meta.env.VITE_CHAT_ATTACHMENTS !== 'false';
+export const CHAT_ATTACHMENTS_ENABLED = import.meta.env.VITE_CHAT_ATTACHMENTS === 'true';
 
 export const SKILLS_GITHUB_REPO =
   import.meta.env.VITE_SKILLS_GITHUB_REPO || 'tinyhumansai/openhuman-skills';