gstack

59 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.

By LeoYeAI/agent-master-skills (GitHub) · coding · 2,186 stars · scanned at commit 8f88f9a

Fast headless browser for QA testing and site dogfooding. Navigate any URL, interact with elements, verify page state, diff before/after actions, take annotated screenshots, check responsive layouts, test forms and uploads, handle dialogs, and assert element states. ~100ms per command. Use when you need to test a feature, verify a deployment, dogfood a user flow, or file a bug with evidence.

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

This is disclosed by the author in the skill's SKILL.md or README. Expected for a coding skill.

Found in 154 places.

skills/gstack/ARCHITECTURE.md, line 110The browser registry (Comet, Chrome, Arc, Brave, Edge) is hardcoded. Database paths are constructed from known constants, never from user input. Keychain access
skills/gstack/ARCHITECTURE.md, line 2742. Spawns `sh -c 'cat prompt | claude -p --output-format stream-json --verbose'`
skills/gstack/SKILL.md, line 22_UPD=$(~/.claude/skills/gstack/bin/gstack-update-check 2>/dev/null || .claude/skills/gstack/bin/gstack-update-check 2>/dev/null || true)

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skills/gstack/SKILL.md, line 92_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
skills/gstack/SKILL.md, line 121$B goto https://app.example.com/login
skills/gstack/SKILL.md, line 140$B goto https://yourapp.com
skills/gstack/SKILL.md, line 153$B goto https://app.example.com/new-feature
skills/gstack/SKILL.md, line 179$B goto https://yourapp.com
skills/gstack/SKILL.md, line 203$B goto https://app.example.com/upload
skills/gstack/SKILL.md, line 213$B goto https://app.example.com/form
skills/gstack/SKILL.md, line 231$B dialog-accept # will auto-accept next alert/confirm
skills/gstack/SKILL.md, line 245$B cookie-import-browser
skills/gstack/SKILL.md, line 259$B diff https://staging.app.com https://prod.app.com
skills/gstack/SKILL.md, line 265echo '[
skills/gstack/SKILL.md, line 280$B is visible ".modal"
skills/gstack/SKILL.md, line 331$B click @e3 $B fill @e4 "value" $B hover @e1
skills/gstack/browse/SKILL.md, line 22_UPD=$(~/.claude/skills/gstack/bin/gstack-update-check 2>/dev/null || .claude/skills/gstack/bin/gstack-update-check 2>/dev/null || true)
skills/gstack/browse/SKILL.md, line 92_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
skills/gstack/browse/SKILL.md, line 112$B goto https://yourapp.com
skills/gstack/browse/SKILL.md, line 121$B goto https://app.com/login

and 134 more places

Sends data to these websites: bun.sh

This is disclosed by the author in the skill's SKILL.md or README.

Found in 32 places.

skills/gstack/BROWSER.md, line 135$B js "await fetch('/api/data').then(r => r.json())" # works
skills/gstack/CHANGELOG.md, line 28- **`$B js "await fetch(...)"` now just works.** Any `await` expression in `$B js` or `$B eval` is automatically wrapped in an async context. No more `SyntaxErr
skills/gstack/README.md, line 629Install it: `curl -fsSL https://bun.sh/install | bash`

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skills/gstack/SKILL.md, line 53**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/SKILL.md, line 1063. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/browse/SKILL.md, line 53**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/browse/SKILL.md, line 1063. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/browse/src/cli.ts, line 189const resp = await fetch(`http://127.0.0.1:${state.port}/health`, {
skills/gstack/browse/src/cli.ts, line 213const resp = await fetch(`http://127.0.0.1:${state.port}/command`, {
skills/gstack/browse/src/cookie-picker-ui.ts, line 331const res = await fetch(BASE + '/cookie-picker' + path, opts);
skills/gstack/browse/test/test-server.ts, line 15fetch(req) {
skills/gstack/document-release/SKILL.md, line 54**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/plan-ceo-review/SKILL.md, line 53**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/plan-eng-review/SKILL.md, line 53**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/qa-only/SKILL.md, line 52**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/qa-only/SKILL.md, line 1203. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/qa-only/SKILL.md, line 162- API endpoints → test them directly with `$B js "await fetch('/api/...')"`
skills/gstack/qa/SKILL.md, line 57**Calibration — this is the bar:** For example, `$B js "await fetch(...)"` used to fail with `SyntaxError: await is only valid in async functions` because gstac
skills/gstack/qa/SKILL.md, line 1583. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/qa/SKILL.md, line 201- API endpoints → test them directly with `$B js "await fetch('/api/...')"`

and 12 more places

Changes files outside its own folder

The author does not mention this.

Found in 39 places.

skills/gstack/BROWSER.md, line 250Or copy the binary directly: `cp browse/dist/browse ~/.claude/skills/gstack/browse/dist/browse`
skills/gstack/CLAUDE.md, line 145Or copy the binary directly: `cp browse/dist/browse ~/.claude/skills/gstack/browse/dist/browse`
skills/gstack/CONTRIBUTING.md, line 47ln -sfn /path/to/your/gstack-fork .claude/skills/gstack

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skills/gstack/CONTRIBUTING.md, line 257ln -sfn /path/to/your/gstack-checkout .claude/skills/gstack
skills/gstack/README.md, line 112> Add gstack to this project: run `cp -Rf ~/.claude/skills/gstack .claude/skills/gstack && rm -rf .claude/skills/gstack/.git && cd .claude/skills/gstack && ./se
skills/gstack/README.md, line 641> Uninstall gstack: remove the skill symlinks by running `for s in browse plan-ceo-review plan-eng-review review ship retro qa qa-only setup-browser-cookies doc
skills/gstack/SKILL.md, line 24mkdir -p ~/.gstack/sessions
skills/gstack/SKILL.md, line 25touch ~/.gstack/sessions/"$PPID"
skills/gstack/browse/SKILL.md, line 24mkdir -p ~/.gstack/sessions
skills/gstack/browse/SKILL.md, line 25touch ~/.gstack/sessions/"$PPID"
skills/gstack/document-release/SKILL.md, line 25mkdir -p ~/.gstack/sessions
skills/gstack/document-release/SKILL.md, line 26touch ~/.gstack/sessions/"$PPID"
skills/gstack/gstack-upgrade/SKILL.md, line 162mkdir -p ~/.gstack
skills/gstack/gstack-upgrade/SKILL.md, line 163echo "$OLD_VERSION" > ~/.gstack/just-upgraded-from
skills/gstack/gstack-upgrade/SKILL.md, line 164rm -f ~/.gstack/last-update-check
skills/gstack/gstack-upgrade/SKILL.md, line 165rm -f ~/.gstack/update-snoozed
skills/gstack/plan-ceo-review/SKILL.md, line 24mkdir -p ~/.gstack/sessions
skills/gstack/plan-ceo-review/SKILL.md, line 25touch ~/.gstack/sessions/"$PPID"
skills/gstack/plan-eng-review/SKILL.md, line 24mkdir -p ~/.gstack/sessions
skills/gstack/plan-eng-review/SKILL.md, line 25touch ~/.gstack/sessions/"$PPID"

and 19 more places

Downloads and installs other software

The author does not mention this.

Found in 7 places.

skills/gstack/README.md, line 629Install it: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/SKILL.md, line 1063. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/browse/SKILL.md, line 1063. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`

Show 4 more

skills/gstack/qa-only/SKILL.md, line 1203. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/qa/SKILL.md, line 1583. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`
skills/gstack/scripts/gen-skill-docs.ts, line 1823. If \`bun\` is not installed: \`curl -fsSL https://bun.sh/install | bash\``;
skills/gstack/setup-browser-cookies/SKILL.md, line 1133. If `bun` is not installed: `curl -fsSL https://bun.sh/install | bash`

Can call paid AI services billed to you

The author does not mention this.

Found in 2 places.

skills/gstack/test/helpers/llm-judge.ts, line 10import Anthropic from '@anthropic-ai/sdk';
skills/gstack/test/skill-llm-eval.test.ts, line 14import Anthropic from '@anthropic-ai/sdk';

Safer alternatives

Low-risk skills in the same category (coding) that look related. Check that one does what you need.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'gstack' ] || [ -L ~/.agents/skills/'gstack' ]; then echo 'A skill folder named gstack already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/LeoYeAI/agent-master-skills' "$d" && git -C "$d" checkout --quiet '8f88f9a0dd5a1075d4f0c7626f9d960844d57575' -- 'skills/gstack' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/gstack' ~/.agents/skills/'gstack' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'gstack' ~/.claude/skills/'gstack' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-08	`8f88f9a`	59
2026-11-07	`8f88f9a`	45