AG Kit is a toolkit that gives Google Antigravity coding agents a structured workspace with rules, skills, specialist agents, workflows, persistent memory, orchestration, MCP guidance, and a safety hook. It is for building and operating agent workflows in Antigravity, and its catalogue entries provide parts of that workspace contract.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/vudovn/ag-kit/claude-mdgit clone --depth 1 https://github.com/vudovn/ag-kitWrote 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.
[](https://agentmods.dev/instructions/vudovn/ag-kit/claude-md)<a href="https://agentmods.dev/instructions/vudovn/ag-kit/claude-md"><img src="https://agentmods.dev/badge/instructions/vudovn/ag-kit/claude-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.01069 | $0.01069 |
| Opus 5 | $0.00535 | $0.00535 |
| Sonnet 5 | $0.00214 | $0.00214 |
| Haiku 4.5 | $0.00107 | $0.00107 |
Grade A, and why
ag-kit CLAUDE.md 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What this is
AG Kit is an Antigravity-first AI agent engineering kit. The product is the .agents/ workspace contract itself (rules, skills, agents, workflows, memory, hooks) — Markdown + JSON consumed by the Google Antigravity runtime, not compiled code. Three deliverables live in one repo:
.agents/— the toolkit: 20 specialist agents (agent/), ~50 skills (skills/), 13 slash-command workflows (workflows/), 6 rules (rules/), persistent memory templates (memory/), plus the Antigravity runtime layer (antigravity.jsoncontract,hooks.jsonPreToolUse safety gate,hooks/*.mjstooling, JSON schemas).cli/— published npm package@vudovn/ag-kit(Node ≥18, ESM). Installs the kit into user projects viagiget. Entry:cli/bin/index.js, managed-tree logic incli/lib/managed-tree.js.web/— docs site (Next.js 16 + MDX + Tailwind 4, React 19). Content data lives in JSON catalogs underweb/src.
Python ≥3.10 (with PyYAML) runs the toolkit validators; Node ≥22 runs the Antigravity tooling.
Commands
All from repo root unless noted.
# Toolkit (.agents/) — run after ANY change to managed components
npm run generate:agents # regenerate manifest.json, manifest.lock.json, DEPENDENCY_GRAPH.md
npm run check:agents # manifest --check + graph --check + validate_kit.py (what CI runs)
npm run test:toolkit # python -m unittest discover -s .agents/scripts/tests -v
# Antigravity runtime layer
npm run check:antigravity # doctor: validates contract, hooks, schemas
npm run test:antigravity # node --test .agents/hooks/tests/antigravity.test.mjs
npm run build:antigravity-plugin
# CLI
npm run test:cli # or: cd cli && node --test test/*.test.js
node --test cli/test/managed-tree.test.js # single test file
# Web (deps installed per-package: npm ci in cli/ and web/)
npm run lint:web
npm run typecheck:web
npm run build:web # next build --webpack (not turbopack)
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.
- 4d ago First seen · 66 lines · 1,069 tokens per session scan A 0f35f4b806f1
ag-kit CLAUDE.md is an instructions file published in the GitHub repository vudovn/ag-kit (8,168 stars, last pushed 4d ago), licensed MIT. It adds 1,069 tokens to every session, about $0.0053 per session on Opus 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.