gstack

Enables fast web browsing for Claude Code with a headless Chromium daemon, allowing navigation, content extraction, and interaction with web pages.

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Security score

The gstack skill was audited on Jun 15, 2026 and we found 82 security issues across 5 threat categories. Review the findings below before installing.

Categories Tested

Security Issues

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SourceSKILL.md

30

```bash

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```bash

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303

```bash

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337	echo "before relying on \`gbrain search\` for code questions in this worktree."

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Curl to non-GitHub URL

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589	curl -fsSL "https://bun.sh/install" -o "$tmpfile"

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Access to hidden dotfiles in home directory

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31	_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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Access to hidden dotfiles in home directory

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33	mkdir -p ~/.gstack/sessions

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Access to hidden dotfiles in home directory

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34	touch ~/.gstack/sessions/"$PPID"

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Access to hidden dotfiles in home directory

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35	_SESSIONS=$(find ~/.gstack/sessions -mmin -120 -type f 2>/dev/null \| wc -l \| tr -d ' ')

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Access to hidden dotfiles in home directory

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36	find ~/.gstack/sessions -mmin +120 -type f -exec rm {} + 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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37	_PROACTIVE=$(~/.claude/skills/gstack/bin/gstack-config get proactive 2>/dev/null \|\| echo "true")

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Access to hidden dotfiles in home directory

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38	_PROACTIVE_PROMPTED=$([ -f ~/.gstack/.proactive-prompted ] && echo "yes" \|\| echo "no")

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Access to hidden dotfiles in home directory

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41	_SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/dev/null \|\| echo "false")

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Access to hidden dotfiles in home directory

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45	source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) \|\| true

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Access to hidden dotfiles in home directory

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48	_SESSION_KIND=$(~/.claude/skills/gstack/bin/gstack-session-kind 2>/dev/null \|\| echo "interactive")

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Access to hidden dotfiles in home directory

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58	_LAKE_SEEN=$([ -f ~/.gstack/.completeness-intro-seen ] && echo "yes" \|\| echo "no")

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Access to hidden dotfiles in home directory

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60	_TEL=$(~/.claude/skills/gstack/bin/gstack-config get telemetry 2>/dev/null \|\| true)

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Access to hidden dotfiles in home directory

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61	_TEL_PROMPTED=$([ -f ~/.gstack/.telemetry-prompted ] && echo "yes" \|\| echo "no")

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Access to hidden dotfiles in home directory

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66	_EXPLAIN_LEVEL=$(~/.claude/skills/gstack/bin/gstack-config get explain_level 2>/dev/null \|\| echo "default")

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Access to hidden dotfiles in home directory

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69	_QUESTION_TUNING=$(~/.claude/skills/gstack/bin/gstack-config get question_tuning 2>/dev/null \|\| echo "false")

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Access to hidden dotfiles in home directory

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71	mkdir -p ~/.gstack/analytics

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Access to hidden dotfiles in home directory

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73	echo '{"skill":"gstack","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(_repo=$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null \| tr -cd 'a-zA-Z0-9._-'); echo "${_repo:-unknown}

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Access to hidden dotfiles in home directory

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75	for _PF in $(find ~/.gstack/analytics -maxdepth 1 -name '.pending-*' 2>/dev/null); do

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Access to hidden dotfiles in home directory

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77	if [ "$_TEL" != "off" ] && [ -x "~/.claude/skills/gstack/bin/gstack-telemetry-log" ]; then

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Access to hidden dotfiles in home directory

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78	~/.claude/skills/gstack/bin/gstack-telemetry-log --event-type skill_run --skill _pending_finalize --outcome unknown --session-id "$_SESSION_ID" 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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84	eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)" 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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90	~/.claude/skills/gstack/bin/gstack-learnings-search --limit 3 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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95	~/.claude/skills/gstack/bin/gstack-timeline-log '{"skill":"gstack","event":"started","branch":"'"$_BRANCH"'","session":"'"$_SESSION_ID"'"}' 2>/dev/null &

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Access to hidden dotfiles in home directory

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100	_ROUTING_DECLINED=$(~/.claude/skills/gstack/bin/gstack-config get routing_declined 2>/dev/null \|\| echo "false")

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Access to hidden dotfiles in home directory

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111	_CHECKPOINT_MODE=$(~/.claude/skills/gstack/bin/gstack-config get checkpoint_mode 2>/dev/null \|\| echo "explicit")

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Access to hidden dotfiles in home directory

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112	_CHECKPOINT_PUSH=$(~/.claude/skills/gstack/bin/gstack-config get checkpoint_push 2>/dev/null \|\| echo "false")

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Access to hidden dotfiles in home directory

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133	In plan mode, allowed because they inform the plan: `$B`, `$D`, `codex exec`/`codex review`, writes to `~/.gstack/`, writes to the plan file, and `open` for generated artifacts.

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Access to hidden dotfiles in home directory

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141	If `SKILL_PREFIX` is `"true"`, suggest/invoke `/gstack-*` names. Disk paths stay `~/.claude/skills/gstack/[skill-name]/SKILL.md`.

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Access to hidden dotfiles in home directory

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143	If output shows `UPGRADE_AVAILABLE <old> <new>`: read `~/.claude/skills/gstack/gstack-upgrade/SKILL.md` and follow the "Inline upgrade flow" (auto-upgrade if configured, otherwise AskUserQuestion with

medium line 148

Access to hidden dotfiles in home directory

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148	- Missing `~/.claude/skills/gstack/.feature-prompted-continuous-checkpoint`: AskUserQuestion for Continuous checkpoint auto-commits. If accepted, run `~/.claude/skills/gstack/bin/gstack-config set che

medium line 149

Access to hidden dotfiles in home directory

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149	- Missing `~/.claude/skills/gstack/.feature-prompted-model-overlay`: inform "Model overlays are active. MODEL_OVERLAY shows the patch." Always touch marker.

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Access to hidden dotfiles in home directory

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162	If B: run `~/.claude/skills/gstack/bin/gstack-config set explain_level terse`.

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Access to hidden dotfiles in home directory

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166	rm -f ~/.gstack/.writing-style-prompt-pending

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Access to hidden dotfiles in home directory

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167	touch ~/.gstack/.writing-style-prompted

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Access to hidden dotfiles in home directory

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176	touch ~/.gstack/.completeness-intro-seen

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Access to hidden dotfiles in home directory

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189	If A: run `~/.claude/skills/gstack/bin/gstack-config set telemetry community`

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Access to hidden dotfiles in home directory

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199	If B→A: run `~/.claude/skills/gstack/bin/gstack-config set telemetry anonymous`

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Access to hidden dotfiles in home directory

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200	If B→B: run `~/.claude/skills/gstack/bin/gstack-config set telemetry off`

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Access to hidden dotfiles in home directory

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204	touch ~/.gstack/.telemetry-prompted

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Access to hidden dotfiles in home directory

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217	If A: run `~/.claude/skills/gstack/bin/gstack-config set proactive true`

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Access to hidden dotfiles in home directory

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218	If B: run `~/.claude/skills/gstack/bin/gstack-config set proactive false`

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Access to hidden dotfiles in home directory

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222	touch ~/.gstack/.proactive-prompted

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Access to hidden dotfiles in home directory

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264	If B: run `~/.claude/skills/gstack/bin/gstack-config set routing_declined true` and say they can re-enable with `gstack-config set routing_declined false`.

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Access to hidden dotfiles in home directory

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268	If `VENDORED_GSTACK` is `yes`, warn once via AskUserQuestion unless `~/.gstack/.vendoring-warned-$SLUG` exists:

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Access to hidden dotfiles in home directory

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280	3. Run `~/.claude/skills/gstack/bin/gstack-team-init required` (or `optional`)

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Access to hidden dotfiles in home directory

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282	5. Tell the user: "Done. Each developer now runs: `cd ~/.claude/skills/gstack && ./setup --team`"

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Access to hidden dotfiles in home directory

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288	eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)" 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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289	touch ~/.gstack/.vendoring-warned-${SLUG:-unknown}

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Access to hidden dotfiles in home directory

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312	_BRAIN_SYNC_BIN="~/.claude/skills/gstack/bin/gstack-brain-sync"

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Access to hidden dotfiles in home directory

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313	_BRAIN_CONFIG_BIN="~/.claude/skills/gstack/bin/gstack-config"

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Access to hidden dotfiles in home directory

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417	If A/B and `~/.gstack/.git` is missing, ask whether to run `gstack-artifacts-init`. Do not block the skill.

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Access to hidden dotfiles in home directory

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422	"~/.claude/skills/gstack/bin/gstack-brain-sync" --discover-new 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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423	"~/.claude/skills/gstack/bin/gstack-brain-sync" --once 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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468	~/.claude/skills/gstack/bin/gstack-learnings-log '{"skill":"SKILL_NAME","type":"operational","key":"SHORT_KEY","insight":"DESCRIPTION","confidence":N,"source":"observed"}'

medium line 478

Access to hidden dotfiles in home directory

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478	`~/.gstack/analytics/`, matching preamble analytics writes.

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Access to hidden dotfiles in home directory

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485	rm -f ~/.gstack/analytics/.pending-"$_SESSION_ID" 2>/dev/null \|\| true

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Access to hidden dotfiles in home directory

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487	~/.claude/skills/gstack/bin/gstack-timeline-log '{"skill":"SKILL_NAME","event":"completed","branch":"'$(git branch --show-current 2>/dev/null \|\| echo unknown)'","outcome":"OUTCOME","duration_s":"'"$_T

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Access to hidden dotfiles in home directory

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490	echo '{"skill":"SKILL_NAME","duration_s":"'"$_TEL_DUR"'","outcome":"OUTCOME","browse":"USED_BROWSE","session":"'"$_SESSION_ID"'","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'"}' >> ~/.gstack/analytics/skill-

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Access to hidden dotfiles in home directory

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493	if [ "$_TEL" != "off" ] && [ -x ~/.claude/skills/gstack/bin/gstack-telemetry-log ]; then

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Access to hidden dotfiles in home directory

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494	~/.claude/skills/gstack/bin/gstack-telemetry-log \

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Access to hidden dotfiles in home directory

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812	`$B` is the browse binary (resolved from `$_ROOT/.claude/skills/gstack/browse/dist/browse` or `~/.claude/skills/gstack/browse/dist/browse`).

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Base64 decode operation

SourceSKILL.md

927	\| `eval <file> [--out <file>] [--raw]` \| Run JavaScript from a file in the page context and return result as string. Path must resolve under /tmp or cwd (no traversal). Use eval for multi-line scripts

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Base64 decode operation

SourceSKILL.md

930	\| `js <expr> [--out <file>] [--raw]` \| Run inline JavaScript expression in the page context and return result as string. Same JS sandbox as eval; the only difference is js takes an inline expr while e

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External URL reference

SourceSKILL.md

172	If `LAKE_INTRO` is `no`: say "gstack follows the Boil the Ocean principle — do the complete thing when AI makes marginal cost near-zero. Read more: https://garryslist.org/posts/boil-the-ocean" Off

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External URL reference

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175	open https://garryslist.org/posts/boil-the-ocean

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External URL reference

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589	curl -fsSL "https://bun.sh/install" -o "$tmpfile"

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External URL reference

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619	$B goto https://app.example.com/login

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External URL reference

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638	$B goto https://yourapp.com

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External URL reference

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651	$B goto https://app.example.com/new-feature

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External URL reference

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677	$B goto https://yourapp.com

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External URL reference

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701	$B goto https://app.example.com/upload

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External URL reference

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711	$B goto https://app.example.com/form

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External URL reference

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760	$B diff https://staging.app.com https://prod.app.com

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External URL reference

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767	["goto","https://app.example.com"],

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External URL reference

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863	\| `goto <url>` \| Navigate to URL (http://, https://, or file:// scoped to cwd/TEMP_DIR) \|

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External URL reference

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908	\| `press <key>` \| Press a Playwright keyboard key against the focused element. Names are case-sensitive: Enter, Tab, Escape, ArrowUp/Down/Left/Right, Backspace, Delete, Home, End, PageUp, PageDown. Mo

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External URL reference

SourceSKILL.md

953	\| `chain (JSON via stdin)` \| Run a sequence of commands from JSON on stdin. One JSON array of arrays, each inner array is [cmd, ...args]. Output is one JSON result per command. Pipe a JSON array (e.g

Scanned on Jun 15, 2026

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Categorydevelopment

UpdatedJune 15, 2026

claude claude-code cursor codex cline frontend design playwright remotion docx git api testing devops mobile backend frontend-developer backend-developer qa-engineer devops-sre product-manager development product

garrytan/gstack