/fast

Turns on fast mode, which skips reasoning plans for quick actions.

According to the central slash command reference, /fast belongs to the Configurations category and enables a sped-up mode where the agent skips reasoning plans before acting, so it responds faster.

✅ WHEN TO USE IT?

Run a simple, clearly-defined action without lengthy planning

Turn on /fast before requesting a simple file rename

⛔ WHEN NOT TO?

A complex task with several dependencies

Without a reasoning plan, complex tasks carry a higher risk of incomplete or incorrect steps.

Better: Leave /fast off, or use /planning for multi-step tasks

SOURCES

Antigravity CLI Doku: Command-Referenz ↗ antigravity.google