Command reference ยท Antigravity CLI
/fast
Command removed since version 1.1.0, replaced by Shift+Tab mode switching
/fast was removed from the CLI in version 1.1.0 (July 8, 2026) โ the central command reference page still lists the command under Configurations with the old description "Enable fast mode (bypass reasoning plans) for quick actions," but according to the modes page and the official changelog this is outdated.
The changelog entry for 1.1.0 describes it like this: "Added /plan mode to replace legacy /planning, and removed /fast slash commands: consolidated and simplified execution mode switching around shift+tab mode cycling and the /plan mode prefix." /fast and /planning were thus removed together and replaced by a mode cycle.
Since then, Shift+Tab cycles between the three modes default (diff review before changes), accept-edits (automatic approval), and plan (automatically prepends the /plan prefix to prompts) โ alternatively via /settings or the --mode flag. The former, plan-less quick behavior of /fast today simply corresponds to the default mode.
โ WHEN TO USE IT?
Historically: speed up a simple action
In CLI versions before 1.1.0, enable /fast to skip the reasoning step for a simple file rename
Use the default mode today
Don't enter any command โ the current default mode already behaves like the former /fast
โ WHEN NOT TO?
Typing /fast in the current version
The command no longer exists as of 1.1.0 (July 8, 2026) and does nothing, or results in an unknown-command error.
Better: Press Shift+Tab to switch between default, accept-edits, and plan
Complex task without planning
Without plan mode or the /plan prefix, the risk of incomplete or incorrect steps rises for multi-layered tasks.
Better: Switch to plan mode via Shift+Tab, or prepend prompts with /plan
SOURCES
- Antigravity CLI docs: command reference โ antigravity.google
MORE COMMANDS ยท Antigravity CLI