A command for starting an Antigravity coding session, where a supervised software worker performs an implementation task. It can run in the background, resume an earlier session, or start fresh.

Use it to launch implementation tasks, attach files such as images, continue previous work, run tasks without waiting, or retrieve results later by session ID.

It manages the practical details of a coding run, including approvals, selected files, model settings, and a record of Git changes.

implement — Command for Claude Code by jinseo-jang

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add jinseo-jang/antigravity-plugin-cc

Claude Code

/plugin install agy

Made for: Claude Code.

Or install agy, the plugin that ships this one along with the rest of its 11 commands, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/jinseo-jang/antigravity-plugin-cc/implement/github.svg)](https://agentmods.dev/commands/jinseo-jang/antigravity-plugin-cc/implement)

Your own site

<a href="https://agentmods.dev/commands/jinseo-jang/antigravity-plugin-cc/implement"><img src="https://agentmods.dev/badge/commands/jinseo-jang/antigravity-plugin-cc/implement/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/jinseo-jang/antigravity-plugin-cc/implement"><img src="https://agentmods.dev/badge/commands/jinseo-jang/antigravity-plugin-cc/implement.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 893 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00012	$0.00893
Opus 5.5	$0.00005	$0.00357
Sonnet 5.5	$0.00002	$0.00179
Haiku 4.5	$0.00001	$0.00089

Measured 2mo ago against content hash deb69ba7cf74, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

implement scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugin/commands/implement.md · 62 lines

What it actually says

Start an implement session. The Antigravity daemon runs the Antigravity SDK worker under supervision, enforcing policy, collecting git diffs, and returning a digest.

Continuity flags:

--background — start the run detached and return a session_id immediately, skipping the watch loop. Retrieve results later with /agy:status <id>, /agy:events <id>, or /agy:watch <id>.
--resume [session_id] — continue a prior run so the worker sees its earlier trajectory. Bare --resume resumes the latest run; put the task text first and --resume last to keep the task intact.
--fresh — force a brand-new conversation (overrides --resume).

--model, --effort, and --file work on all variants.

When --file is an image, the worker should look at the image directly rather than writing throwaway shell scripts to inspect it — unnecessary scripts trigger extra approval prompts.

!python "${CLAUDE_PLUGIN_ROOT}/scripts/cao-companion.py" --plugin-data "${CLAUDE_PLUGIN_DATA}" session.implement "$ARGUMENTS"

The command above prints a JSON object with a session_id.

Recovery on error: if the companion returns a JSON-RPC error (e.g. -32602 for an incompatible --model/--effort/location combo), do NOT just print it. Present the error message and its Options via the AskUserQuestion tool, then re-run session.implement with the corrected args.

Foreground (no --background): supervise the session until it finishes, using the Antigravity companion via the Bash tool:

Watch: run python "${CLAUDE_PLUGIN_ROOT}/scripts/cao-companion.py" --plugin-data "${CLAUDE_PLUGIN_DATA}" session.wait <session_id>. It blocks up to ~25s and returns a pending approval, "running", or "finished".
If it reports "running", run session.wait <session_id> again.
If it reports a pending approval (a shell command needs a decision), call the AskUserQuestion tool showing the exact command, with four options: Approve once, Approve for this project, Approve always, and Deny. Then apply the user's choice by running the companion:
- Approve once: ... cao-companion.py session.approve <call_id>
- Approve for this project: ... cao-companion.py session.approve <call_id> project
- Approve always: ... cao-companion.py session.approve <call_id> global
- Deny: ... cao-companion.py session.deny <call_id> "For this project" and "always" remember the EXACT command so identical future commands auto-approve without prompting. Then return to step 1.
When it reports the session finished, run ... cao-companion.py session.events <session_id> and show the user the digest.

Never approve or deny on your own — the user decides every approval via AskUserQuestion.

Background (--background): do NOT watch. Print the returned session_id and the retrieval hints (/agy:status <id>, /agy:events <id>, /agy:watch <id>) and stop. If a non-allowlisted shell command is hit while unattended, the session suspends; /agy:status <id> prints the paste-ready /agy:approve <id> [project|global] line. The 5-minute approval timeout auto-denies — for long unattended runs, pre-allowlist expected commands with "Approve for this project" / "Approve always".

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 62 lines · 12 tokens per session scan A deb69ba7cf74

Subscribe to this mod's changes

implement is a command published in the GitHub repository jinseo-jang/antigravity-plugin-cc (6 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 12 tokens to every session and 893 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

implement next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
implementjinseo-jang/antigravity-plugin-cc	Command	6	2mo ago	Apache-2.0	A	12	Claude Code
checklistgithub/spec-kit	Command	149k	today	MIT	A	13	Claude Code
clarifygithub/spec-kit	Command	149k	today	MIT	A	27	Claude Code
specifygithub/spec-kit	Command	149k	today	MIT	A	13	Claude Code
convergegithub/spec-kit	Command	149k	today	MIT	A	35	Claude Code
implementgithub/spec-kit	Command	149k	today	MIT	A	14	Claude Code
speckit.bug.fixgithub/spec-kit	Command	149k	today	MIT	A	12	Claude Code