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Olivier Dupont e8ad489f36 Initial commit — Antigravity plugin v0.1.0

Plugin Claude Code miroir du plugin codex officiel d'OpenAI, mais
pour Google Antigravity (agy CLI). Headless via:

  agy --print --dangerously-skip-permissions --print-timeout 10m

Includes:
- 1 forwarder agent (antigravity-rescue)
- 5 slash commands (setup, rescue, status, result, cancel)
- 3 internal skills (cli-runtime, result-handling, gemini-prompting)
- agy-companion.mjs runtime (task / setup / status / result / cancel)
- marketplace.json for `/plugin marketplace add`

Tested: setup OK, foreground task OK, background workflow OK
(except OAuth refresh which requires interactive TTY).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-19 23:57:41 +02:00

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name, description, user-invocable

name	description	user-invocable
antigravity-result-handling	Internal guidance for presenting Antigravity (Gemini) helper output back to the user	false

Antigravity Result Handling

This skill governs how Claude should present output that comes back from the agy-companion.mjs helper.

Foreground task

When a foreground task returns:

The stdout is the raw Gemini response from agy --print.
Return it verbatim to the user. Do not paraphrase, summarize, restructure, or add commentary.
If the response is empty or the command exited non-zero, tell the user one short sentence: "Antigravity returned nothing — try /antigravity:status or rerun with /antigravity:setup."
If the response mentions errors that suggest agy is not authenticated, suggest running agy login in a terminal.

Background task

When a background task is started, the helper prints something like:

[antigravity] Job started in background.
  job id   : agy-xxxx-xxxxx
  pid      : 12345
  log file : /Users/.../jobs/agy-xxxx.log
  status   : node "..." status agy-xxxx-xxxxx
  result   : node "..." result agy-xxxx-xxxxx

Present this to the user as-is. Do not block on polling.

Status / result

When the user runs /antigravity:status, the helper prints job metadata (pid, started, log path, prompt preview). When they run /antigravity:result, the helper streams the full log. Return it verbatim.

Streaming considerations

agy --print in headless mode often outputs the model's tokens as they arrive. The companion script streams them to stdout. Do not hold the output until the end — Claude can present it as it streams.

Length

Antigravity responses can be long. Do not truncate or summarize unless the user explicitly asks for a summary. If the response is very long, mention at the end: "(Antigravity response was N lines)".

Errors

If the helper exits with a non-zero code:

Exit code 124 = timeout. Tell the user the prompt timed out and suggest --timeout 20m or --background.
Exit code 2 = invalid args. Show the user what was wrong.
Other = unknown error. Pass through the stderr.

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