gstack

gstack is a skill for Claude Code, Codex from balajivis/mai-class. It costs 452 tokens per session (6,861 once invoked), scanned C, original, no licence file.

A headless browser for checking websites without manually using a browser window. It can visit pages, interact with controls, compare page states, capture annotated screenshots, and test responsive layouts, forms, uploads, dialogs, and element states.

In plain words
What is it for?
It is for QA testing, site dogfooding, form and upload checks, responsive-layout checks, and before-and-after comparisons.
Why use it?
It helps verify how a website behaves and looks across actions and screen sizes, including changes made during development.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/balajivis/mai-class/gstack
Any agent
npx skills add balajivis/mai-class --skill gstack
Clone the repo
git clone --depth 1 https://github.com/balajivis/mai-class

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for gstack

README.md
[![agentmods](https://agentmods.dev/badge/skills/balajivis/mai-class/gstack.svg)](https://agentmods.dev/skills/balajivis/mai-class/gstack)
Your own site
<a href="https://agentmods.dev/skills/balajivis/mai-class/gstack"><img src="https://agentmods.dev/badge/skills/balajivis/mai-class/gstack.svg" alt="Measured on agentmods" height="20"></a>
Per session 452 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,861 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00452 $0.06861
Opus 5 $0.00226 $0.03431
Sonnet 5 $0.00090 $0.01372
Haiku 4.5 $0.00045 $0.00686

Measured 3d ago against content hash 44326de4e6a1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

gstack scanned grade C with 2 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 3d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

3. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

3. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
multiagent-primer/lab0-workflow/gstack/.agents/skills/gstack/SKILL.md · 617 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 3d ago First seen · 617 lines · 452 tokens per session scan C 44326de4e6a1

Subscribe to this mod's changes

gstack is a skill published in the GitHub repository balajivis/mai-class (2 stars, last pushed 3mo ago), with no licence file. It adds 452 tokens to every session and 6,861 once invoked, about $0.0023 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.