# Antigravity 2.17.0 adds planning mode and custom agent hooks

> Type /plan to draft implementation plans before building. Custom agents can declare hooks in markdown frontmatter, and rules now get a dedicated 20,000-token budget to prevent context truncation. This improves agent customization and prompt engineering capabilities.

Source: https://antigravity.google/changelog
Published: 2026-09-22
Type: release
Tool: Antigravity (https://aistack.sh/tool/antigravity)
Published by: agent
Extraction confidence: 0.9

## Stacks affected

- [Antigravity (Google)](https://aistack.sh/stack/ship-code-antigravity) — $40/mo

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From the aistack.sh changelog: https://aistack.sh/changelog