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Gemini CLI → Antigravity CLI Migration ​

Google is retiring Gemini CLI on June 18, 2026. On that date, Gemini CLI and the Gemini Code Assist IDE extensions stop serving requests for Google AI Pro/Ultra and free Gemini Code Assist for individuals. Enterprise plans (Gemini Code Assist Standard/Enterprise, and GCA for GitHub via Google Cloud) are unaffected.

The successor is the Antigravity CLI (agy), the Go-based CLI that shipped with Antigravity 2.0 at Google I/O 2026. It carries over the most critical features of Gemini CLI — Agent Skills, Hooks, MCP, and rules/context files — though Google has stated there is no 1:1 feature parity right out of the gate.

This guide explains how to move a rulesync configuration from the geminicli target to the new antigravity-cli target.

geminicli is not removed ​

Rulesync keeps the geminicli target:

  • Enterprise access to Gemini CLI continues past June 18, 2026.
  • Countless existing GEMINI.md / .gemini/ repositories still depend on it.

geminicli is simply marked deprecated in the supported tools matrix. New projects should prefer antigravity-cli; existing projects can keep generating both during a transition.

Feature mapping ​

Featuregeminicliantigravity-cli
rulesroot GEMINI.md + .gemini/memories/root GEMINI.md + .agents/rules/; global ~/.gemini/GEMINI.md
skills.gemini/skills/.agents/skills/; global ~/.gemini/antigravity-cli/skills/
mcp.gemini/settings.json (mcpServers).agents/mcp_config.json; global ~/.gemini/antigravity-cli/mcp_config.json
hooks.gemini/ (Gemini hook shape).agents/hooks.json; global ~/.gemini/config/hooks.json (Claude-Code-like matcher shape)
permissions.gemini/settings.jsonglobal ~/.gemini/antigravity-cli/settings.json (permissions.allow/ask/deny)
commands.gemini/commands/ (TOML)not yet supported — Antigravity CLI exposes slash commands via skills
subagents.gemini/agents/not yet supported — CLI subagents are only definable via plugin bundles

Notable differences ​

  • MCP: Antigravity uses serverUrl (not url) for HTTP servers and honors a disabledTools array. Rulesync emits the Antigravity-compatible shape automatically.
  • Hooks: Antigravity uses a Claude-Code-like hooks.json with a matcher shape, not the Gemini CLI hook format. Rulesync currently translates the preToolUse, postToolUse, and stop events for Antigravity.
  • Permissions: The Antigravity CLI reads permissions only from the global ~/.gemini/antigravity-cli/settings.json; there is no documented workspace-scoped permissions file, so rulesync generates this file in global mode only. The canonical bash tool maps to Antigravity's command tool name.
  • Commands / subagents: These are intentionally out of scope for antigravity-cli today. Antigravity surfaces slash commands through skills. CLI subagents are defined and managed at runtime (the interactive /agents panel and the orchestrator's invoke_subagent / define_subagent tools), and the only file-based way to ship one is bundled inside a plugin (a namespaced package of skills + subagents + rules + MCP + hooks). There is no standalone, declarative per-agent file (analogous to geminicli's .gemini/agents/) that rulesync could generate, and the plugin bundle does not map cleanly onto rulesync's per-feature model. Keep generating subagents with geminicli if you still rely on them.

Updating rulesync.jsonc ​

Replace the geminicli target with antigravity-cli. For example:

jsonc
{
  "targets": {
    // Before
    // "geminicli": { "rules": true, "skills": true, "mcp": true, "hooks": true, "permissions": true },

    // After
    "antigravity-cli": {
      "rules": true,
      "skills": true,
      "mcp": true,
      "hooks": true,
      "permissions": true,
    },
  },
}

To generate global-scope files (including the permissions file, which is global-only), run with --global:

bash
rulesync generate --targets antigravity-cli --global

You can keep both targets enabled during a transition so the same .rulesync/ sources fan out to both .gemini/ (Gemini CLI) and .agents/ (Antigravity CLI) trees.

See also ​

Released under the MIT License.

Copyright © dyoshikawa