Google Antigravity: the agent app, the agy CLI that replaced Gemini CLI, and its skills

Google Antigravity is Google's agent-first development platform. It launched on November 18, 2025 as a free public preview built around an agentic IDE. On May 19, 2026 Google added the Antigravity 2.0 desktop app, the Antigravity CLI, built in Go, and a Python SDK. On August 20, 2026 it reached other editors through IDE extensions, Visual Studio Code generally and Visual Studio, JetBrains and Zed in preview, and became available inside eligible Gemini Enterprise subscriptions. The CLI, run as agy, replaced Gemini CLI for free and Google AI Pro and Ultra users on June 18, 2026.

#What does Antigravity cost?

The individual plan is $0 a month and includes Gemini 3.1 Pro, the Gemini Flash models, Claude Sonnet and Opus 4.6 and gpt-oss-120b, under basic weekly rate limits. Google AI Pro and Ultra raise those limits, and their quota refreshes every five hours alongside separate weekly limits, where everyone else refreshes weekly. Pro and Ultra also carry an AI credit pool used solely as an overage mechanism at standard Gemini Enterprise Agent Platform consumption pricing, with no per-credit price published. Organisations buy through Google Cloud on consumption-based pricing. The dollar figures come from Google's May 19, 2026 plan post, not the pricing page: $20 a month for Pro, and $100 or $200 a month for Ultra. Bring-your-own-key and bring-your-own-endpoint are not supported for extra rate limits.

#How do you extend Antigravity?

Skills are SKILL.md folders. Workspace skills live in .agents/skills; global skills live in ~/.gemini/config/skills for the desktop app and IDE, and in ~/.gemini/antigravity-cli/skills for the CLI. Only description is required in the frontmatter, and you can invoke one by hand as /<skill-name>. Plugins wrap that work in a plugin.json where only name is required, and only for the CLI, because 2.0 and the IDE fall back to the folder name; CLI installs are staged at ~/.gemini/antigravity-cli/plugins/<name>/. MCP servers go in mcp_config.json, globally under ~/.gemini/config/ or per workspace under .agents/, and the IDE ships an MCP Store. Hooks sit in .agents/hooks.json with a 30 second default timeout, alongside Markdown subagents and rules. Workflows are deprecated and retire on November 1, 2026; /migrate-workflows converts them into skills. See Agent Skills and MCP.

#Moving from Gemini CLI?

Run agy where legacy configuration exists and an interactive checklist offers to migrate your extensions, global configuration and stored tokens. agy plugin import gemini converts Gemini CLI extensions into plugins. Workspace skills do not move themselves: relocate .gemini/skills to .agents/skills by hand. MCP definitions move into mcp_config.json, and the old url and httpUrl keys become serverUrl. The CLI still reads GEMINI.md and AGENTS.md. Comparing terminal agents? See Claude Code.