atomr-agents-coding-cli-vendor-antigravity

Google Antigravity CLI (agy) adapter for the coding-cli harness. Successor to the Gemini CLI adapter — the legacy gemini CLI is deprecated and stops serving requests on 2026-06-18.

Unlike the old Gemini CLI, Antigravity serves non-Gemini models (Claude, etc.) through Google's cloudcode-pa.googleapis.com backend, selectable via the model flag, so a single vendor can drive multiple model families.

Install the CLI with:

curl -fsSL https://antigravity.google/cli/install.sh | bash
# installs to ~/.local/bin/agy

Headless invocation

agy -p <prompt>
  --output-format stream-json
  --non-interactive
  [--model <id>]    # any model id, including non-Gemini (e.g. Claude)
  [--yolo]          # if PolicySnapshot.auto_approve_unrestricted

The binary name, flags, and on-disk config layout are all configurable via AntigravityConfig (the defaults above mirror the Gemini CLI surface). Operators can correct any field — e.g. once agy --help documents its real headless flags — without a code change: AntigravityVendor::with_config(AntigravityConfig { .. }).

Concept projection

Antigravity lacks a native skill / agent registry, so persona, skills, and project memory are concatenated into a single <workdir>/.antigravity/system_instructions.md file. MCP servers land in <workdir>/.antigravity/settings.json under the mcpServers key. The config directory and filenames are overridable via AntigravityConfig.