Use Spec Kitty in Google Antigravity

Tier: partial — Spec Kitty installs Antigravity's commands as Agent Skills, but loading them in a live Antigravity session has not been smoke-tested end-to-end.

Prerequisites

  • Spec Kitty CLI installed. See Install Spec Kitty.
  • Project initialized for this harness: 
    spec-kitty init --ai antigravity
    To add Antigravity to an existing project, run spec-kitty agent config add antigravity.
  • Google Antigravity installed and configured. Follow the official Antigravity documentation.

Where Spec Kitty installs files

Google Antigravity stopped reading .agent/workflows/ on 2026-10-19 and reads Agent Skills from the shared .agents/skills/ root. Spec Kitty installs:

  • Directory: .agents/skills/spec-kitty-<command>/
  • Files: one SKILL.md per command (spec-kitty-specify/SKILL.md, spec-kitty-plan/SKILL.md, spec-kitty-tasks/SKILL.md, spec-kitty-implement/SKILL.md, etc.).
  • Manifest: .kittify/command-skills-manifest.json records that Antigravity references each command-skill package.

The shared .agents/skills/ tree can be co-owned by Codex, Vibe, Pi, Letta, and Antigravity. Do not copy or edit the generated SKILL.md files manually; use spec-kitty agent config sync or spec-kitty upgrade to refresh them.

Spec Kitty no longer writes any file into .agent/workflows/, in the project or in your home folder.

Canonical invocation

Invoke a command skill by its name:

/spec-kitty-specify "<one-line mission description>"
/spec-kitty-plan
/spec-kitty-tasks
/spec-kitty-implement WP01

This invocation remains provisional until a live Antigravity smoke test is recorded.

Upgrading from the workflow files

spec-kitty upgrade moves each Spec Kitty-generated .agent/workflows/spec-kitty.<command>.md file into its own backup folder and installs the command skills:

.kittify/backups/antigravity-workflows/.backup-<timestamp>/.agent/workflows/spec-kitty.<command>.md

Files Spec Kitty did not generate, and the .agent/ folders, stay where they are. The CLI also removes the unedited spec-kitty.*.md files it once wrote into ~/.agent/workflows/. See Command skills renamed for the Agent Skills specification.

Verification status

Do not promote Antigravity to supported until a maintainer with Antigravity installed records:

  • The Antigravity version used.
  • That Antigravity lists the spec-kitty-* skills from .agents/skills/.
  • Successful launch of at least one spec-kitty-<command> skill from a real Antigravity session.

Troubleshooting

  • The spec-kitty-* skills do not appear. Confirm .agents/skills/spec-kitty-specify/SKILL.md exists, run spec-kitty agent config sync from the repo root, then restart Antigravity.

  • spec-kitty doctor skills names a folder that blocks a command skill. Your own folder sits at a spec-kitty-<command>/ path. Rename or remove it, then run spec-kitty doctor skills --fix.

  • The agent command is present but help mentions Cursor. That is not Antigravity. Install or locate Antigravity before recording verification evidence.

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