Antigravity Delegate

When to Use

• You want to delegate a bounded coding task to a separate agy implementer (Google Antigravity) and then review its diff yourself.
• The user explicitly asked for delegation to this implementer.

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 Antigravity's opinion on code you wrote (a --read-only dispatch covers review without edits, but a plain review may not need delegation at all).

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.

These checks do not prove that a headless write will be approved. In --print mode, Antigravity cannot prompt for a write permission and may auto-deny it. The relay detects that denial instead of reporting completion.

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>"
# reasoning effort (low, medium, high): add --effort high
# read-only (plan mode — no edits):     add --read-only
# 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 ch