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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 10, 2026 and we found 82 security issues across 5 threat categories. Review the findings below before installing.

Categories Tested

Security Issues

medium line 30

Template literal with variable interpolation in command context

SourceSKILL.md
30```bash
medium line 280

Template literal with variable interpolation in command context

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280```bash
medium line 296

Template literal with variable interpolation in command context

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296```bash
medium line 330

Template literal with variable interpolation in command context

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330echo "before relying on \`gbrain search\` for code questions in this worktree."
medium line 582

Curl to non-GitHub URL

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582curl -fsSL "https://bun.sh/install" -o "$tmpfile"
low line 31

Access to hidden dotfiles in home directory

SourceSKILL.md
31_UPD=$(~/.claude/skills/gstack/bin/gstack-update-check 2>/dev/null || .claude/skills/gstack/bin/gstack-update-check 2>/dev/null || true)
low line 33

Access to hidden dotfiles in home directory

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33mkdir -p ~/.gstack/sessions
low line 34

Access to hidden dotfiles in home directory

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34touch ~/.gstack/sessions/"$PPID"
low line 35

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 ' ')
low line 36

Access to hidden dotfiles in home directory

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36find ~/.gstack/sessions -mmin +120 -type f -exec rm {} + 2>/dev/null || true
low line 37

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")
low line 38

Access to hidden dotfiles in home directory

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38_PROACTIVE_PROMPTED=$([ -f ~/.gstack/.proactive-prompted ] && echo "yes" || echo "no")
low line 41

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")
low line 45

Access to hidden dotfiles in home directory

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45source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
low line 48

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")
low line 51

Access to hidden dotfiles in home directory

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51_LAKE_SEEN=$([ -f ~/.gstack/.completeness-intro-seen ] && echo "yes" || echo "no")
low line 53

Access to hidden dotfiles in home directory

SourceSKILL.md
53_TEL=$(~/.claude/skills/gstack/bin/gstack-config get telemetry 2>/dev/null || true)
low line 54

Access to hidden dotfiles in home directory

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54_TEL_PROMPTED=$([ -f ~/.gstack/.telemetry-prompted ] && echo "yes" || echo "no")
low line 59

Access to hidden dotfiles in home directory

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59_EXPLAIN_LEVEL=$(~/.claude/skills/gstack/bin/gstack-config get explain_level 2>/dev/null || echo "default")
low line 62

Access to hidden dotfiles in home directory

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62_QUESTION_TUNING=$(~/.claude/skills/gstack/bin/gstack-config get question_tuning 2>/dev/null || echo "false")
low line 64

Access to hidden dotfiles in home directory

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64mkdir -p ~/.gstack/analytics
low line 66

Access to hidden dotfiles in home directory

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66echo '{"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}
low line 68

Access to hidden dotfiles in home directory

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68for _PF in $(find ~/.gstack/analytics -maxdepth 1 -name '.pending-*' 2>/dev/null); do
low line 70

Access to hidden dotfiles in home directory

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70if [ "$_TEL" != "off" ] && [ -x "~/.claude/skills/gstack/bin/gstack-telemetry-log" ]; then
low line 71

Access to hidden dotfiles in home directory

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71~/.claude/skills/gstack/bin/gstack-telemetry-log --event-type skill_run --skill _pending_finalize --outcome unknown --session-id "$_SESSION_ID" 2>/dev/null || true
low line 77

Access to hidden dotfiles in home directory

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77eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)" 2>/dev/null || true
low line 83

Access to hidden dotfiles in home directory

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83~/.claude/skills/gstack/bin/gstack-learnings-search --limit 3 2>/dev/null || true
low line 88

Access to hidden dotfiles in home directory

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88~/.claude/skills/gstack/bin/gstack-timeline-log '{"skill":"gstack","event":"started","branch":"'"$_BRANCH"'","session":"'"$_SESSION_ID"'"}' 2>/dev/null &
low line 93

Access to hidden dotfiles in home directory

SourceSKILL.md
93_ROUTING_DECLINED=$(~/.claude/skills/gstack/bin/gstack-config get routing_declined 2>/dev/null || echo "false")
low line 104

Access to hidden dotfiles in home directory

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104_CHECKPOINT_MODE=$(~/.claude/skills/gstack/bin/gstack-config get checkpoint_mode 2>/dev/null || echo "explicit")
low line 105

Access to hidden dotfiles in home directory

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105_CHECKPOINT_PUSH=$(~/.claude/skills/gstack/bin/gstack-config get checkpoint_push 2>/dev/null || echo "false")
medium line 126

Access to hidden dotfiles in home directory

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126In 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.
medium line 134

Access to hidden dotfiles in home directory

SourceSKILL.md
134If `SKILL_PREFIX` is `"true"`, suggest/invoke `/gstack-*` names. Disk paths stay `~/.claude/skills/gstack/[skill-name]/SKILL.md`.
medium line 136

Access to hidden dotfiles in home directory

SourceSKILL.md
136If 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 141

Access to hidden dotfiles in home directory

SourceSKILL.md
141- 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 142

Access to hidden dotfiles in home directory

SourceSKILL.md
142- Missing `~/.claude/skills/gstack/.feature-prompted-model-overlay`: inform "Model overlays are active. MODEL_OVERLAY shows the patch." Always touch marker.
medium line 155

Access to hidden dotfiles in home directory

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155If B: run `~/.claude/skills/gstack/bin/gstack-config set explain_level terse`.
low line 159

Access to hidden dotfiles in home directory

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159rm -f ~/.gstack/.writing-style-prompt-pending
low line 160

Access to hidden dotfiles in home directory

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160touch ~/.gstack/.writing-style-prompted
low line 169

Access to hidden dotfiles in home directory

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169touch ~/.gstack/.completeness-intro-seen
medium line 182

Access to hidden dotfiles in home directory

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182If A: run `~/.claude/skills/gstack/bin/gstack-config set telemetry community`
medium line 192

Access to hidden dotfiles in home directory

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192If B→A: run `~/.claude/skills/gstack/bin/gstack-config set telemetry anonymous`
medium line 193

Access to hidden dotfiles in home directory

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193If B→B: run `~/.claude/skills/gstack/bin/gstack-config set telemetry off`
low line 197

Access to hidden dotfiles in home directory

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197touch ~/.gstack/.telemetry-prompted
medium line 210

Access to hidden dotfiles in home directory

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210If A: run `~/.claude/skills/gstack/bin/gstack-config set proactive true`
medium line 211

Access to hidden dotfiles in home directory

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211If B: run `~/.claude/skills/gstack/bin/gstack-config set proactive false`
low line 215

Access to hidden dotfiles in home directory

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215touch ~/.gstack/.proactive-prompted
medium line 257

Access to hidden dotfiles in home directory

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257If 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`.
medium line 261

Access to hidden dotfiles in home directory

SourceSKILL.md
261If `VENDORED_GSTACK` is `yes`, warn once via AskUserQuestion unless `~/.gstack/.vendoring-warned-$SLUG` exists:
medium line 273

Access to hidden dotfiles in home directory

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2733. Run `~/.claude/skills/gstack/bin/gstack-team-init required` (or `optional`)
medium line 275

Access to hidden dotfiles in home directory

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2755. Tell the user: "Done. Each developer now runs: `cd ~/.claude/skills/gstack && ./setup --team`"
low line 281

Access to hidden dotfiles in home directory

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281eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)" 2>/dev/null || true
low line 282

Access to hidden dotfiles in home directory

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282touch ~/.gstack/.vendoring-warned-${SLUG:-unknown}
low line 305

Access to hidden dotfiles in home directory

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305_BRAIN_SYNC_BIN="~/.claude/skills/gstack/bin/gstack-brain-sync"
low line 306

Access to hidden dotfiles in home directory

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306_BRAIN_CONFIG_BIN="~/.claude/skills/gstack/bin/gstack-config"
medium line 410

Access to hidden dotfiles in home directory

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410If A/B and `~/.gstack/.git` is missing, ask whether to run `gstack-artifacts-init`. Do not block the skill.
low line 415

Access to hidden dotfiles in home directory

SourceSKILL.md
415"~/.claude/skills/gstack/bin/gstack-brain-sync" --discover-new 2>/dev/null || true
low line 416

Access to hidden dotfiles in home directory

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416"~/.claude/skills/gstack/bin/gstack-brain-sync" --once 2>/dev/null || true
low line 461

Access to hidden dotfiles in home directory

SourceSKILL.md
461~/.claude/skills/gstack/bin/gstack-learnings-log '{"skill":"SKILL_NAME","type":"operational","key":"SHORT_KEY","insight":"DESCRIPTION","confidence":N,"source":"observed"}'
medium line 471

Access to hidden dotfiles in home directory

SourceSKILL.md
471`~/.gstack/analytics/`, matching preamble analytics writes.
low line 478

Access to hidden dotfiles in home directory

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478rm -f ~/.gstack/analytics/.pending-"$_SESSION_ID" 2>/dev/null || true
low line 480

Access to hidden dotfiles in home directory

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480~/.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
low line 483

Access to hidden dotfiles in home directory

SourceSKILL.md
483echo '{"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-
low line 486

Access to hidden dotfiles in home directory

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486if [ "$_TEL" != "off" ] && [ -x ~/.claude/skills/gstack/bin/gstack-telemetry-log ]; then
low line 487

Access to hidden dotfiles in home directory

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487~/.claude/skills/gstack/bin/gstack-telemetry-log \
medium line 805

Access to hidden dotfiles in home directory

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805`$B` is the browse binary (resolved from `$_ROOT/.claude/skills/gstack/browse/dist/browse` or `~/.claude/skills/gstack/browse/dist/browse`).
medium line 920

Base64 decode operation

SourceSKILL.md
920| `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
medium line 923

Base64 decode operation

SourceSKILL.md
923| `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
low line 165

External URL reference

SourceSKILL.md
165If `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
low line 168

External URL reference

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168open https://garryslist.org/posts/boil-the-ocean
low line 582

External URL reference

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582curl -fsSL "https://bun.sh/install" -o "$tmpfile"
low line 612

External URL reference

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612$B goto https://app.example.com/login
low line 631

External URL reference

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631$B goto https://yourapp.com
low line 644

External URL reference

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644$B goto https://app.example.com/new-feature
low line 670

External URL reference

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670$B goto https://yourapp.com
low line 694

External URL reference

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694$B goto https://app.example.com/upload
low line 704

External URL reference

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704$B goto https://app.example.com/form
low line 753

External URL reference

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753$B diff https://staging.app.com https://prod.app.com
low line 760

External URL reference

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760["goto","https://app.example.com"],
low line 856

External URL reference

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856| `goto <url>` | Navigate to URL (http://, https://, or file:// scoped to cwd/TEMP_DIR) |
low line 901

External URL reference

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901| `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
low line 946

External URL reference

SourceSKILL.md
946| `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 10, 2026
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GitHub Stars 104.9K
Rating
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Categorydevelopment
UpdatedJune 10, 2026
claudeclaude-codecursorcodexclinefrontenddesignplaywrightremotiondocxgitapitestingdevopsmobilebackendfrontend-developerbackend-developerqa-engineerdevops-sreproduct-managerdevelopmentproduct
garrytan/gstack