Google's Flutter and Firebase Plugins Gain Custom Agents
Source Google Antigravity blog

At a glance
Teams across Google have started adding custom agents, AI helpers built for specific jobs, to the official Antigravity plugins offered through Build with Google. Three agents were presented, covering accessibility checks that help everyone use an app, security rules, and pre-release app reviews.
Key points
The Flutter accessibility agent spots missing semantic labels for screen readers, touch targets smaller than 48x48 dp, and color contrast problems, then fixes the code.
The Firebase Security Rules agent writes Firestore security rules from your data structure and app needs, and catches overly loose read and write access ahead of time.
The Firebase agent comes inside the official Firebase plugin and can be switched on from settings.
Developers can also build a read-only agent with Android skills that checks Google Play submission requirements and run it from the terminal.
Why it matters
Labor-intensive work like accessibility audits and security rule writing can now be handed to specialist agents inside the development workspace.
Original article
Custom agents in Google plugins
Google Antigravity blog · Sep 28, 2026, 10:11 AM GMT+9 · antigravity.google
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