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What this is

The kit also works with Google Antigravity. The repo has a .agent/rules/ directory with Markdown rule files. Antigravity loads them automatically when you open the repo, so the AI follows the same ideas: plan first (SPEC), ask one question at a time, don’t invent things, and include security when you touch sensitive stuff.

When to use it​

Use it when you prefer Antigravity over Cursor or Copilot but want the same workflow and safety habits. The rules are plain Markdown (same content as the Cursor rules, no YAML front matter).

Steps​

Do this:

  1. Install the kit (copy from kit/ and fill placeholders). See Start here → Install (by copying the kit).
  2. Open the repo in Google Antigravity. The .agent/rules/ directory is loaded automatically; you don’t need to paste rules.
  3. Start new work with Session Kickoff, Context Pack (filled in), and Router prompt so the AI knows the project and the rules.
  4. If the AI goes off track, use Switch: SPEC or Switch: IMPLEMENT.

Antigravity uses:

  • .agent/rules/*.md for project rules (plain Markdown; same content as Cursor rules)
  • docs/ai/* for source-of-truth docs

Artefact mapping​

Antigravity has its own first-class artefacts. Here's how the kit's outputs map to them:

Kit artefactAntigravity artefactNotes
Spec Packageimplementation_plan.mdBoth are "plan before code." The agent presents it for your review.
Handoff Summarywalkthrough.mdBoth summarize what was done and what's next.
Context PackGEMINI.md or AGENTS.mdPaste your switches (platform type, exposure, data sensitivity) here.
Task breakdown (IMPLEMENT)task.mdThe agent's living checklist during implementation.

Antigravity stores these in ~/.gemini/antigravity/brain/<conversation-id>/.

Common mistakes​

  • Not having the kit in the repo. Without .agent/rules/, Antigravity won’t follow the kit’s rules.
  • Expecting Cursor-specific features (e.g. .cursor/prompts/, .cursor/lenses/) in Antigravity. Antigravity uses .agent/rules/ only; use the same Session Kickoff, Context Pack, and Router text from the docs when you start a session.