Agy

AGY Agent Plugins

Open-source Claude Code and Codex plugin adapters that delegate review and rescue workflows to the Antigravity CLI (agy).

This repository does not implement Antigravity itself. It wraps a locally installed agy binary so another coding agent can ask Antigravity for a second review, adversarial pass, or bounded rescue task.

What Is Included

• Claude Code plugin marketplace metadata in .claude-plugin/.
• Codex plugin marketplace metadata in .agents/plugins/.
• One plugin, plugins/agy, with Claude slash commands and a Codex MCP server.
• Shared Node.js runtime scripts for launching, tracking, reading, and cancelling AGY jobs.
• A focused Node test suite for runtime safety, plugin structure, and MCP behavior.

Requirements

• Node.js 18.18 or newer.
• Git.
• A working Antigravity CLI named agy on your PATH.
• Claude Code or Codex, depending on which adapter you want to use.

On some agy installs, print mode may report no active conversation until an Antigravity conversation has been opened or resumed once. setup verifies the binary and required flags; actual delegation still depends on the local agy session state.

Install In Claude Code

Add this repository as a Claude Code plugin marketplace, then install the agy plugin from it:

/plugin marketplace add https://github.com/iicmaster/antigravity-plugins
/plugin install agy@claude-code-agy
/reload-plugins
/agy:setup

For local development, replace the GitHub URL with your local checkout path.

Claude Commands

• /agy:setup checks whether agy is installed and exposes the flags this plugin needs.
• /agy:review sends the current git context to agy for read-only review.
• /agy:adversarial-review sends a stricter review prompt focused on hidden risks.
• /agy:rescue delegates a bounded investigation or fix request to agy.
• /agy:status, /agy:result, and /agy:cancel manage jobs launched by the companion runtime.

Install In Codex

Add this repository as a Codex plugin marketplace, install the agy plugin, then confirm the MCP server is visible:

codex plugin marketplace add https://github.com/iicmaster/antigravity-plugins
codex plugin add agy@antigravity-plugins
codex mcp list

For interactive Codex sessions, ask Codex to use an AGY MCP tool such as agy_setup, agy_review, or agy_rescue. A safe install smoke test is:

codex exec -C <repo-path> --ephemeral \
  'Use the AGY MCP tool agy_setup. Do not modify files. Reply with the exact tool output.'

If your non-interactive Codex policy cannot approve MCP tools, verify the local runtime directly instead of disabling sandbox protections just for installation testing:

node plugins/agy/scripts/agy-companion.mjs setup

Repository Layout

.agents/plugins/               Codex marketplace metadata
.claude-plugin/                Claude Code marketplace metadata
docs/                          Architecture and future project notes
plugins/agy/                   The AGY plugin
plugins/agy/commands/          Claude Code slash commands
plugins/agy/skills/agy/        Codex-facing skill instructions
plugins/agy/scripts/           Shared companion, worker, and MCP runtime
tests/                         Node.js test suite

Local BMAD, Claude, and agent skill installs are intentionally ignored by git. They are development workflow files, not part of the public plugin contract.

Development

npm test
node plugins/agy/scripts/agy-companion.mjs setup
node plugins/agy/scripts/agy-companion.mjs setup --json
node plugins/agy/scripts/agy-mcp-server.mjs

The runtime stores job state under CLAUDE_PLUGIN_DATA/state when Claude Code provides that environment variable. Outside Claude Code it falls back to /tmp/agy-companion/<workspace-hash>/.

Security Model

• agy is spawned with shell: false from runtime code.
• User prompt text is piped through child stdin in print mode, not passed through argv or shell-interpolated command text.
• --dangerously-skip-permissions is never enabled unless explicitly requested.
• The default AGY execution mode uses --sandbox.
• Codex MCP arguments are validated before reaching the companion runtime, and the MCP rescue tool does not expose sandbox-disable or dangerous permission-bypass flags.
• Job state is written outside the repository by default.

Limitations

• This is a wrapper around a local agy binary. It does not provide hosted Antigravity access.
• AGY authentication, availability, and model behavior are controlled by the user's local Antigravity installation.
• The Codex MCP adapter is local to this plugin. A standalone shared MCP package may be extracted later if the tool contract stabilizes.
• The current release targets Unix-like shells for the Codex MCP launcher.

License

MIT. See LICENSE.