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 skills/vudovn/ag-kit/vulnerability-scannernpx skills add vudovn/ag-kit --skill vulnerability-scannergit 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/skills/vudovn/ag-kit/vulnerability-scanner)<a href="https://agentmods.dev/skills/vudovn/ag-kit/vulnerability-scanner"><img src="https://agentmods.dev/badge/skills/vudovn/ag-kit/vulnerability-scanner.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 | $0.00028 | $0.01883 |
| Opus 5 | $0.00014 | $0.00941 |
| Sonnet 5 | $0.00006 | $0.00377 |
| Haiku 4.5 | $0.00003 | $0.00188 |
Grade A, and why
vulnerability-scanner 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 5d 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.
Copies of this mod
7 near-identical copies found in the catalogue:
- vulnerability-scanner — 94% identical, 2 lines differ
- vulnerability-scanner — 94% identical, 2 lines differ
- vulnerability-scanner — 94% identical, 2 lines differ
- vulnerability-scanner — 94% identical, 2 lines differ
- vulnerability-scanner — 94% identical, 2 lines differ
- vulnerability-scanner — 91% identical, 5 lines differ
- vulnerability-scanner — 88% identical, 16 lines differ
How it starts
The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vulnerability Scanner
Think like an attacker, defend like an expert. 2025 threat landscape awareness.
🔧 Runtime Scripts
Execute for automated validation:
| Script | Purpose | Usage |
|---|---|---|
scripts/security_scan.py |
Validate security principles applied | python scripts/security_scan.py <project_path> |
📋 Reference Files
| File | Purpose |
|---|---|
| checklists.md | OWASP Top 10, Auth, API, Data protection checklists |
1. Security Expert Mindset
Core Principles
| Principle | Application |
|---|---|
| Assume Breach | Design as if attacker already inside |
| Zero Trust | Never trust, always verify |
| Defense in Depth | Multiple layers, no single point |
| Least Privilege | Minimum required access only |
| Fail Secure | On error, deny access |
Threat Modeling Questions
Before scanning, ask:
- What are we protecting? (Assets)
- Who would attack? (Threat actors)
- How would they attack? (Attack vectors)
- What's the impact? (Business risk)
2. OWASP Top 10:2025
Risk Categories
| Rank | Category | Think About |
|---|---|---|
| A01 | Broken Access Control | Who can access what? IDOR, SSRF |
| A02 | Security Misconfiguration | Defaults, headers, exposed services |
| A03 | Software Supply Chain 🆕 | Dependencies, CI/CD, build integrity |
| A04 | Cryptographic Failures | Weak crypto, exposed secrets |
| A05 | Injection | User input → system commands |
| A06 | Insecure Design | Flawed architecture |
| A07 | Authentication Failures | Session, credential management |
| A08 | Integrity Failures | Unsigned updates, tampered data |
| A09 | Logging & Alerting | Blind spots, no monitoring |
| A10 | Exceptional Conditions 🆕 | Error handling, fail-open states |
2025 Key Changes
2021 → 2025 Shifts:
├── SSRF merged into A01 (Access Control)
├── A02 elevated (Cloud/Container configs)
├── A03 NEW: Supply Chain (major focus)
├── A10 NEW: Exceptional Conditions
└── Focus shift: Root causes > Symptoms
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 279 lines · 28 tokens per session scan A 8c0d6ad513e2
vulnerability-scanner is a skill published in the GitHub repository vudovn/ag-kit (8,168 stars, last pushed 4d ago), licensed MIT. It adds 28 tokens to every session and 1,883 once invoked, about $0.0001 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.
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chat-perf
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