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description: "Antigravity subagent: drive the official Google Antigravity CLI (agy) as a one-shot coding subagent in DeepSeek Harness (subagent_antigravity), including Gemini 4 Argon on an Antigravity subscription." kind: "package-bundle"

dsh-subagent-antigravity

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Adds an Antigravity subagent to DeepSeek Harness (DSH): a parent session can call subagent_antigravity to run the official Google Antigravity CLI (agy) as a fresh coding agent inside the parent workspace — it edits files, runs commands, and returns only its final answer.

It has the same shape as the official Codex subagent (subagent_codex) and the Claude Code subagent (subagent_claude_code), but the backend is Antigravity, so it needs no separate Gemini API key: it uses your signed-in Antigravity Google account subscription and can drive Gemini 4 Argon (gemini-4-argon-low/medium/high).

Community plugin; not affiliated with Google. The Antigravity CLI is Google's official CLI — this plugin only drives it from DSH.

Why this plugin exists

• Gemini CLI cannot use Gemini 4 yet. Gemini CLI 0.64 tops out at gemini-3.8-flash / gemini-3.1-pro-preview; the Gemini 4 support request (google-gemini/gemini-cli#29689) is still open, and Gemini 4 is not a public API model. Gemini 4 Argon is currently offered through Antigravity for Google AI Pro / Ultra subscribers, and agy models lists what your account can use.
• So "call Gemini 4 like Codex" means driving the Antigravity CLI, not the Gemini CLI. (A sibling plugin, dsh-subagent-gemini, covers the Gemini CLI route and will support Gemini 4 once Google ships it there.)

How it works

parent session (DeepSeek model)
   │  calls tool subagent_antigravity({ description, prompt })
   ▼
DSH subagent seam (ctx.subagents)
   │  provider: antigravity (registered by this plugin)
   ▼
run layer: spawn agy --print --output-format stream-json
   │  parse NDJSON events (init / step_update / result), keep the final answer
   ▼
agy (separate process, parent cwd, your Antigravity sign-in and subscription)
   │  uses Antigravity's own tools (files, terminal, browser, MCP …)
   ▼
final answer → parent conversation

One delegation = one fresh process, one turn, final answer only. The child's reasoning, tool traffic and stderr never enter the parent conversation; failures return fixed stage/category diagnostics instead of raw stderr or credentials.

Requirements

Dependency	Version / notes
DeepSeek Harness	0.2.1-rc.2 series (ctx.subagents + @deepseek-ai/dsh-tool-subagent)
Node.js	^22.19.0 or >=24
Google Antigravity CLI (agy)	official CLI, 1.4+; agy --version must answer
Antigravity account	signed in through the Antigravity app or CLI (AI Pro / Ultra for Gemini 4 Argon)

Install the official CLI:

# macOS / Linux
curl -fsSL https://antigravity.google/cli/install.sh | bash
# Windows (PowerShell)
# irm https://antigravity.google/cli/install.ps1 | iex

agy --version      # expect 1.4.2+
agy models         # lists the models your account can use (incl. gemini-4-argon-*)

Sign-in is shared across local Antigravity surfaces; if the app is already signed in, agy normally works directly. Otherwise run agy once and complete the Google sign-in. Enterprise accounts can use AGY_ADC_AUTH=true with gcloud auth application-default login, or the GEMINI_API_KEY mode (note: an API key cannot reach Gemini 4 unless that key itself is entitled).

Install the plugin

From the DSH plugin market (recommended): search for dsh-subagent-antigravity, install and enable it.

From the command line:

dsh plugin --profile desktop add dsh-subagent-antigravity

Then add the package to that profile's package.json → dsh.profile.bundles and restart (or let the profile recompose):

"dsh": {
  "profile": {
    "bundles": ["…", "dsh-subagent-antigravity"]
  }
}

Once enabled, every agent sees the global tool subagent_antigravity (a running session picks it up on its next request).

Usage

{
  "name": "subagent_antigravity",
  "arguments": {
    "description": "Fix login timeout",
    "prompt": "In the workspace, raise the login request timeout from 5s to 15s, run the related tests, and reply only with what you changed and the test result."
  }
}

• description — 3–5 word task name;
• prompt — a self-contained task; the child cannot see the parent conversation.

Configuration

Override the subagent-antigravity entry's config in a profile patch:

Field	Default	Meaning
providerName	antigravity	name registered on ctx.subagents; unique per profile
command	empty (auto-detect)	path to agy; empty searches PATH, ~/.local/bin, /opt/homebrew/bin, /usr/local/bin, …
model	gemini-4-argon-medium	fixed model; agy models lists the live catalogue (gemini-4-argon-*, gemini-3.8-flash-*, claude-*-5-5-*, …)
effort	empty	low / medium / high / xhigh / max
mode	empty	accept-edits / auto / plan (read-only)
skipPermissions	true	pass --dangerously-skip-permissions so an unattended child can edit/run; with false, headless cannot prompt and write tools are auto-denied
sandbox	false	pass --sandbox (the CLI's terminal sandbox)
timeoutMs	900000 (15 min)	overall wall-clock budget per delegation
disposeGraceMs	5000	SIGTERM→SIGKILL escalation grace
env	{}	extra child environment variables
extraArgs	[]	extra CLI arguments for forward compatibility

Example — Gemini 4 Argon High, read-only:

- id: subagent-antigravity
  config:
    model: gemini-4-argon-high
    mode: plan
    skipPermissions: false

Security and permissions

• The default skipPermissions: true is unattended: the child may edit files and run commands without a human approval prompt. That is what makes delegated coding tasks possible; use it in trusted workspaces and review git diff.
• For read-only delegation use mode: plan with skipPermissions: false; headless mode cannot prompt, so write attempts are auto-denied and reported as a permission failure instead of silently continuing.
• The child is a separate process: DSH's subprocess seam scrubs credential-like variables from the parent environment; only env entries are forwarded.
• No telemetry. No credential is read, logged or returned by this plugin; the Antigravity sign-in is managed by the CLI itself.

Troubleshooting

Symptom	Fix
Antigravity CLI (agy) was not found	run the official install script and verify agy --version
diagnostic category: auth	not signed in: run agy once and complete the Google sign-in
diagnostic category: permission	headless cannot prompt: keep skipPermissions: true or use mode: plan
diagnostic category: quota	the model has no quota/rate left for this account right now
diagnostic category: timeout	raise timeoutMs or split the task
want to verify the machine	npm run smoke in the plugin checkout (one small Antigravity request)

Compatibility and development

• Unit tests: npm test (34 cases: config normalization, CLI discovery, and the run layer's event parsing, timeout, cancellation, permission and failure mapping);
• End-to-end self-check: npm run smoke (real agy + Gemini 4 Argon, expects PONG);
• No private DSH packages are imported (only @deepseek-ai/schemastery for config validation), so the run layer is unit-testable outside the host;
• Reference implementation: official @deepseek-ai/dsh-subagent-codex (the one-process-per-run, one-turn, final-answer, safe-diagnostics contract).

Uninstall

dsh plugin --profile desktop remove dsh-subagent-antigravity

Then remove dsh-subagent-antigravity from the profile's dsh.profile.bundles and restart.

License

MIT. Antigravity and its name belong to Google; this project is not affiliated with Google.