antigravity-seo: Go engine and token-efficient SEO audits for Antigravity CLI

An SEO and Generative Engine Optimization (GEO) suite for Google Antigravity, powered by Go.

Note

Lineage: Inspired by claude-seo by Daniel Agrici. Antigravity SEO replaces Python/Playwright runtimes with a single Go binary (seo-engine) and native agent tools (search_web, read_url_content).

Pricing based on September 2026 rates. Multi-agent crawls fan out to flash_lite subagents for penny-scale execution.

- Token Economics: Claude Opus 5 thinking traces bill at $25/1M, making multi-page audits costly ($4–$8+). Gemini 3.8 Flash ($0.75 / $3.75) cuts costs by 85–90% (~$0.60), while flash_litesubagent swarms handle raw crawling for <$0.15.

- Zero-Dependency Go Engine: seo-engineis a standalone binary with 10ms execution, eliminating Python venvs, pip modules, and headless browser daemons.

- Native Grounding: Live Google SERP analysis and markdown extraction use Antigravity's built-in search_webandread_url_contentwithout paid third-party MCPs.

- Built-in GSC & Backlinks: Direct RSA/PKCS8 JWT authentication for Google Search Console and keyless Common Crawl CDX index lookups.

- Native A4 PDF Reports: Built-in PDF report generation (--pdf) viafpdfmatching executive print standards with zero external dependencies.

flowchart LR

User([User]) --> Skills["21 Antigravity Skills\nAudit • Schema • Content • GEO • Backlinks"]

Skills --> Engine["Go Engine (seo-engine)\nFast audits, crawler, GSC, & PDF generation"]

Skills --> Native["Native Grounding\nsearch_web & read_url_content"]

Engine --> Output["Deliverables\nCLI • JSON • Enterprise A4 PDF"]

macOS / Linux:

curl -fsSL https://raw.githubusercontent.com/angelotc/antigravity-seo/main/install.sh | bashWindows (PowerShell):

irm https://raw.githubusercontent.com/angelotc/antigravity-seo/main/install.ps1 | iexInstalls the plugin to ~/.gemini/config/plugins/antigravity-seo and symlinks seo-engine into your PATH.

git clone https://github.com/angelotc/antigravity-seo.git

cd antigravity-seo

bash install.sh # On Windows: powershell -ExecutionPolicy Bypass -File install.ps1Verify anytime with:

seo-engine doctorAll commands support --json. Core audit features are 100% keyless.

- Orchestration: seo,seo-audit,seo-page

- Technical & Content: seo-technical,seo-content,seo-schema,seo-geo,seo-images,seo-hreflang,seo-drift,seo-backlinks

- Search & Local: seo-local,seo-maps,seo-ecommerce,seo-cluster,seo-sxo

- Strategy: seo-plan,seo-programmatic,seo-competitor-pages,seo-content-brief,seo-flow

The plugin also includes a PostToolUse schema hook that automatically validates JSON-LD files upon write, blocking deprecated schemas and placeholder text.

The engine and skills run 100% natively via standard shell execution (seo-engine <command> [options] <url> --json) with zero MCP middleware. Simply ensure seo-engine is in your $PATH (or run install.sh).

- Antigravity: Native execution via run_command

- OpenCode: Register skills path in opencode.json:"skills": { "paths": ["~/.gemini/config/plugins/antigravity-seo/skills"] }

- Claude Code: Symlink or copy skills into ~/.claude/skills/

- Codex / Cursor / Aider: Invoke seo-enginedirectly via the terminal / bash tool

MIT — see LICENSE.