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/vidyfoo/antigravity-skill-engine/webapp-testingnpx skills add VidyFoo/antigravity-skill-engine --skill webapp-testinggit clone --depth 1 https://github.com/VidyFoo/antigravity-skill-engineWhat 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 | $0.00035 | $0.00185 |
| Opus 5 | $0.00017 | $0.00093 |
| Sonnet 5 | $0.00007 | $0.00037 |
| Haiku 4.5 | $0.00003 | $0.00018 |
Grade A, and why
webapp-testing 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 2d 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.
What it actually says
WebApp Testing Guide
Overview
This skill provides a comprehensive toolkit for testing and debugging web applications using Playwright.
Core Operations
Start a Dev Server
Before testing, ensure your web app is running.
npm run dev
Run Playwright Tests
Execute automated tests to verify functionality.
npx playwright test
Debugging with Browser
Use the browser tool to interact with the app manually and inspect state.
Best Practices
- Use unique IDs for interactive elements to simplify selection.
- Clear browser logs and screenshots before each test run for clean results.
- Record videos of failed tests for easier debugging.
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.
- 2d ago First seen · 33 lines · 35 tokens per session scan A 5a53271b5825
webapp-testing is a skill published in the GitHub repository VidyFoo/antigravity-skill-engine (12 stars, last pushed 7mo ago), licensed MIT. It adds 35 tokens to every session and 185 once invoked, about $0.0002 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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