Antigravity (antigravity extension)

Independent native Pi provider for Google Antigravity-compatible model access.

The extension folder is antigravity, and the provider registered inside Pi is antigravity.

Usage

# From this checkout
pi --extension ./packages/antigravity

# Or via nothing
pi --antigravity

Inside Pi:

/login antigravity
/model antigravity/gemini-3.8-flash
/antigravity.doctor

The extension uses a native streamSimple transport. It does not shell out to the official agy CLI.

NPM

npm install -g @raquezha/antigravity

Provider

• Provider id: antigravity
• Public model ids:
  • gemini-3.8-flash
  • gemini-3.5-flash
  • gemini-3.1-pro
  • gemini-4-argon
  • claude-sonnet-5-5
  • claude-opus-5-5
  • gpt-oss-120b
• Runtime routing examples:
  • gemini-3.8-flash -> gemini-3.8-flash-tiered
  • Flash 3.8 thinking is server-managed (the single high selector maps to automatic thinking), not separate low/medium/high runtime IDs.
  • gemini-3.5-flash -> routes internally by reasoning level (off/low/medium/high) to Antigravity runtime IDs such as gemini-3.5-flash-low, gemini-3.5-flash-medium, or gemini-3.5-flash-high
  • gemini-3.1-pro -> routes internally to gemini-3.1-pro-low or gemini-pro-agent
  • gemini-4-argon -> routes internally by reasoning level to gemini-4-argon-low, gemini-4-argon-medium, or gemini-4-argon-high (falls back to unified gemini-4-argon)
  • claude-sonnet-5-5 -> routes internally by reasoning level to claude-sonnet-5-5-low, claude-sonnet-5-5-medium, or claude-sonnet-5-5-high
  • claude-opus-5-5 -> routes internally by reasoning level to claude-opus-5-5-low, claude-opus-5-5-medium, or claude-opus-5-5-high
  • gpt-oss-120b -> routes to gpt-oss-120b-medium
• Default endpoint: https://cloudcode-pa.googleapis.com (fallback: https://daily-cloudcode-pa.sandbox.googleapis.com)

Catalog map keys are runtime IDs; nested MODEL_PLACEHOLDER_* values are not. Discovery uses exact keys first, then matching display names for renamed routes. Catalog presence does not guarantee quota or entitlement: a 429 requires waiting for the reported reset or checking your subscription, not another model alias.

After updating this checkout, run /reload in Pi to load the extension changes.

Diagnostics

/antigravity.doctor prints sanitized routing information, including unlabeled catalog IDs, with no stale match from a previous request. It must not print OAuth tokens, refresh tokens, authorization headers, prompts, or credential files.

Claude uses the backend's legacy tool-schema field; literal const constraints are converted to single-value enums. Request-format errors retain the backend's rejected-field message for diagnosis.

Run offline regression checks with npm test -w @raquezha/antigravity.

Optional overrides

Prefer the ANTIGRAVITY_* names for environment alignment. The older NOAGY_* names remain accepted as backwards-compatible aliases.

• ANTIGRAVITY_BASE_URL — override the Cloud Code/Antigravity endpoint for experiments.
• ANTIGRAVITY_PROJECT_ID — fallback project id if project discovery does not return one.
• ANTIGRAVITY_CALLBACK_HOST — OAuth callback bind host, default 127.0.0.1.
• ANTIGRAVITY_USER_AGENT — override user agent for endpoint compatibility experiments.
• ANTIGRAVITY_RUNTIME_MODEL — force a runtime model id for endpoint experiments.
• ANTIGRAVITY_CLIENT_ID / ANTIGRAVITY_CLIENT_SECRET — advanced OAuth app overrides; normally not needed.