Antigravity Delegate

You are the orchestrator. This skill lets you hand a bounded coding task to a separate implementer - the Google Antigravity CLI (agy) - then review what it produced and land it yourself. You write the brief and own the judgment; Antigravity does the typing in its own conversation; you verify and commit.

Nothing here is specific to one orchestrating agent. The loop needs only the ability to run a shell command and read a file, so any comparable agent can drive it. It is designed for and run on Claude Code; treat other orchestrators as designed-for, not yet proven.

When NOT to use this

• The task is small enough to just do inline - delegation overhead is not worth it.
• The agy CLI is not installed or not authenticated. Install it from Antigravity's CLI docs and run the first-launch setup.
• You want to write the code yourself, or you only need a review without edits. This relay does not expose a proven CLI-enforced read-only mode yet.

Prerequisites (check once)

1. agy help succeeds. If not, install the Antigravity CLI and complete first-launch setup.
2. agy models succeeds. That proves the CLI can authenticate and list the available model labels.
3. You are in (or will point --cd at) the target git repository.

Choose the implementer model

agy has a configured default model, so --model is optional. Use it when the human has a preferred Antigravity model label for the task. Otherwise let Antigravity use its own current default rather than guessing.

The loop

Run these five steps per task. Steps 1, 4, and 5 are your judgment; 2 and 3 are mechanical.

1. Write the brief

Antigravity sees only the text you send plus what it can inspect in the workspace - no chat history, no shared context. Everything the task needs goes in the brief: the goal, the current state, what to change, what to leave untouched, the project's actual gate commands, and a report contract. Tell Antigravity it will not commit (you will). Keep one task per brief. Full guidance and a template: references/writing-the-brief.md.

2. Dispatch

Send the brief to Antigravity with the bundled helper. It wraps agy --print, captures the run, and writes a structured result.json - so your only job is "run a command, read a file." (<skill-dir> below is this skill's installed directory - the folder containing this SKILL.md.)

node "<skill-dir>/scripts/relay.mjs" --brief brief.txt --cd /path/to/repo
# choose a model label:                 add --model "<label from agy models>"
# enable Antigravity terminal sandbox:  add --sandbox
# resume the most recent conversation:  add --resume-last  (delta brief only)
# see all options:                      node .../relay.mjs --help

The helper starts a fresh Antigravity project by default and passes --add-dir <repo> (the --cd path, absolute) so agy has an explicit workspace. It does not pass --dangerously-skip-permissions by default. Mechanics, flags, and the result.json shape: references/dispatch-and-poll.md.

3. Wait for completion

The helper blocks until Antigravity finishes, so back it with whatever your orchestrator offers and resume when it returns:

• Claude Code: run the Bash call with run_in_background: true; you are notified on completion.
• Plain shell / other agents: run it in the foreground for short tasks, or background it and poll the result file.

Do not trust progress trackers over reality: a run is finished when result.json is written and the process has exited. Read the working tree, not a status line. The implementer's full report is the finalMessage field in result.json (also printed in full on stdout between the report markers).

4. Review - do not trust the self-report

Antigravity's result.json includes its own final message and any gate claims. Re-verify, don't accept:

• Re-run the project's gates yourself (the test/lint/build commands from step 1).
• Read the diff against the brief: did Antigravity do what was asked, nothing more and nothing less? touchedFiles in the result is your starting point.
• Run the relevant guard skills on the diff if you have them installed.
• For schema/migration changes, round-trip them; for removals, grep for dangling references.

Full checklist: references/review-and-land.md.

5. Land it

The implementer edits the working tree; the orchestrator commits. Only after the gates pass and the diff holds:

• Commit the verified work yourself, with a clear message.
• If it needs changes, send a delta brief with --resume-last and review again.

Permission model

Antigravity owns its own permission policy. The relay does not bypass it by default. Use --dangerously-skip-permissions only when the human explicitly accepts that Antigravity may auto-approve tool permission requests. Use --sandbox when you want Antigravity's terminal sandbox enabled for the run. Antigravity's own help says --dangerously-skip-permissions auto-approves all tool permission requests without prompting, including a request to act outside the sandbox. Do not treat --sandbox as an enforced boundary when the flags are combined; treat the run as full access.

Authorization model

Delegation is something the human opts into. Once they have ("run this queue", "proceed"), committing verified, gate-passing work is the agreed contract. Two limits on that mandate: surface, don't absorb (report Antigravity's design decisions, defensible-but-unasked turns, and non-blocking nitpicks rather than silently keeping them) and stop for scope changes (if correct completion needs going beyond the brief, ask - don't expand the mandate yourself). The full treatment is in references/review-and-land.md.

References

• references/writing-the-brief.md - how to write a brief Antigravity can execute blind: structure, XML blocks, the report contract, and real gate commands.
• references/dispatch-and-poll.md - relay.mjs flags, the result.json contract, backgrounding per orchestrator, and recovery when a run misbehaves.
• references/review-and-land.md - the review checklist, the commit boundary, and the rework cycle via --resume-last.
• references/multi-task-queues.md - running a sequential queue: carrying constraints forward, progress tracking, and the end-of-run coherence check.