Google Antigravity release notes: 2.17.0 adds /plan before coding

Google Antigravity 2.17.0 adds /plan: the agent drafts a plan you can read and edit before it writes code. Antigravity is Google's workspace for AI agents. The release note is dated September 22, 2026; new app versions roll out gradually and may take a few days to reach all users.

Source: Google Antigravity changelog, version 2.17.0.

Google Antigravity release notes: plan before changing code

Type /plan to get a draft plan. The Agent setting governing review is now called Plan Review Policy. You can review every plan, let the agent decide when review is worthwhile, or skip review entirely.

Source for the command and setting: Google Antigravity 2.17.0: Plan before you build.

Short example: use the new Antigravity feature

Human step: Type /plan in Antigravity 2.17.0. Then describe the change you want to plan, for example with the following prompt. Read and edit the plan before coding starts.

Source for planning: Google Antigravity 2.17.0.

Plan how to add a date-range filter to this project's search field. Read the existing search implementation first. Identify affected files, how to handle empty dates, and the tests needed. Do not write code yet.

Check the plan:

• File references should match the project's existing search implementation.
• The plan should cover empty dates and tests for the interval boundaries.

Project configuration migration in 2.17.0

Repository customization settings now load from <project>/.gemini/config.json. The older .agents/settings.json is no longer read. If you use personal_customization_dir, move that entry into the new file. This is a separate human step when updating, not part of the example prompt.

Source for paths and migration: Google Antigravity 2.17.0: Per-project configuration moved.