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Fast headless browser for QA testing and site dogfooding. Navigate pages, interact with elements, verify state, diff before/after, take annotated screenshots, test responsive layouts, forms, uploads, dialogs, and capture bug evidence. Use when asked to open or test a site, verify a deployment, dogfood a user flow, or file a bug with screenshots. (gstack)
Claude Skills are markdown + scripts loaded into Claude Code; scanned with the same pipeline.
We found this by crawling public sources and nobody has attested to it. That is how most of the registry gets here, and it is not a mark against the artifact — it only means no authenticated act of publication is on record. An artifact can be the vendor's own and still appear here.
151 critical findings reported by cisco-skill-scanner, agent-audit-kit, 136 of them in the installed artifact. The composite score alone does not reflect this — read the per-scanner reports below.
This artifact ships from 2 sources and their verdicts differ. The worst is github (Flagged). Installing from a cleaner source does not mean the others are safe — check the source you actually install from.
github: https://github.com/a29paul/hexlens, 2367 findings
Claude Skills install to a single target, no runtime picker.
nerlo install -- 'a29paul/hexlens (gstack)'
Manual alternative: copy the skill folder into ~/.claude/skills/ so Claude Code loads it on next launch.
cp -r -- 'a29paul/hexlens (gstack)' ~/.claude/skills/
Install respects the composite badge: Clean proceeds, Caution prompts for confirmation, and Flagged is refused. Write operations require an API token.
6 of 11 scanners examined this package. The rest do not apply to it — language, ecosystem and packaging decide which analyzers can say anything, and a scanner that cannot examine an artifact reports nothing rather than passing it.
v1.4.0
0 findings · 0.6s
v2.0.11
1775 findings · 26.4s
v0.3.74
68 findings · 18.1s
v0.1.0
36 findings · 11.9s
v0.1.0
5 findings · 11.9s
v0.1.0
0 findings · 11.7s
vv0.3.2
No Go packages were found in this artifact. What each scanner covers
0 findings · 0.1s
No report in this scan: govulncheck, osv-scanner, trivy, trivy_image.
1 scan on record. Every scan's full results are retained immutably for 24 months.
| Completed | Composite | Change | Scanners | Status |
|---|---|---|---|---|
| Aug 22, 2026 | Scan Halted | — | agentshield: completecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completecapslock ·n/a: not applicablenerlo-multi-source: complete | rejected |
Findings in files this artifact installs stand as reported; a model re-read the rest and said which ones it believes are false positives. This is a second opinion published beside the evidence, not a correction to it: the per-scanner reports above are unchanged, every dismissed finding is still listed there at its original severity, and the score and the Flagged badge are computed from those raw severities alone. Nothing below moved them.
Out of 1,884 findings across every scanner that examined this package. 15 of 151 findings rated critical by their scanner were among the dismissals.
Not reviewed is not the same as clean. Those 2 findings stand exactly as their scanners reported them, at full severity, as they would have without this review.
Two keys had to turn. The model had to name a reason from a fixed list of six, and a deterministic check of ours — over which files this artifact actually installs — had to independently agree. Anything it could not corroborate is in “not reviewed” above, at full severity.
738 Test or fixture file — The match is in a test or fixture. Our own check confirmed the file is not part of what gets installed.
Rules: YARA_prompt_injection_generic, AAK-TAINT-001, AAK-MCP-015 and 11 more · Files: /repo/.claude/skills/gstack/browse/test/fixtures/injection-hidden.html, /repo/.claude/skills/gstack/browse/test/fixtures/injection-visible.html, .claude/skills/gstack/browse/test/findport.test.ts and 10 more · reported by cisco-skill-scanner, agent-audit-kit
9 Documentation or example — The match is in documentation or sample code, confirmed by our own check to be outside the installed artifact.
Rules: AAK-IPI-WILD-CORPUS-001, AAK-HEALTHCARE-AI-004, MANIFEST_MISSING_LICENSE · Files: .claude/skills/gstack/AGENTS.md, .claude/skills/gstack/docs/skills.md, .claude/skills/gstack/docs/designs/ML_PROMPT_INJECTION_KILLER.md and 5 more · reported by agent-audit-kit, cisco-skill-scanner
4 CI or editor configuration — The match is in build, CI or editor configuration, confirmed by our own check to be outside the installed artifact.
Rules: opt.nerlo-rules.nerlo-install-pipe-to-shell, AAK-GHA-IMMUTABLE-001, opt.nerlo-rules.nerlo-install-run-bundled-artifact · Files: /repo/.claude/skills/gstack/.github/docker/Dockerfile.ci, .github/workflows/release.yml · reported by nerlo-install-instruction, agent-audit-kit
2 Agent instruction file — The match is in a file that instructs an AI coding agent — a CLAUDE.md or similar. It is documentation of intent, and our own check confirmed it is not part of what gets installed.
Rules: FILE_MAGIC_MISMATCH · Files: /repo/web/CLAUDE.md · reported by cisco-skill-scanner
These findings are in files this artifact installs and are not placeholder values. No false-positive basis can be corroborated for such a finding, so this review never dismisses one; they were not sent to the model and stand at their scanner's severity.
439 YARA_autonomy_abuse_generic
Files: /repo/.claude/skills/gstack/scripts/resolvers/testing.ts, /repo/.claude/skills/gstack/ship/SKILL.md, /repo/.claude/skills/gstack/office-hours/SKILL.md · reported by cisco-skill-scanner
265 DATA_EXFIL_JS_FS_ACCESS
Files: /repo/.claude/skills/gstack/browse/src/browser-manager.ts, /repo/.claude/skills/gstack/browse/src/cli.ts, /repo/.claude/skills/gstack/browse/src/config.ts and 30 more · reported by cisco-skill-scanner
120 COMMAND_INJECTION_JS_CHILD_PROCESS
Files: /repo/.claude/skills/gstack/browse/src/browser-manager.ts, /repo/.claude/skills/gstack/browse/src/bun-polyfill.cjs, /repo/.claude/skills/gstack/browse/src/cli.ts and 13 more · reported by cisco-skill-scanner
108 DATA_EXFIL_JS_NETWORK
Files: /repo/.claude/skills/gstack/browse/src/bun-polyfill.cjs, /repo/.claude/skills/gstack/browse/src/cli.ts, /repo/.claude/skills/gstack/browse/src/cookie-picker-ui.ts and 15 more · reported by cisco-skill-scanner
48 MANIFEST_MISSING_LICENSE
2 The model did not answer for these findings.
Rules: SOCIAL_ENG_VAGUE_DESCRIPTION · Files: /repo/.claude/skills/gstack/docs/SKILL.md, /repo/.claude/skills/gstack/docs/designs/SKILL.md · reported by cisco-skill-scanner
Artifact contains numerous critical command injection and shell execution vulnerabilities.
The artifact exhibits extensive command injection capabilities, particularly through JavaScript child processes in files like `/repo/.claude/skills/gstack/bin/gstack-global-discover.ts` and `/repo/.claude/skills/gstack/browse/src/browser-manager.ts`. It also includes multiple instances of shell execution via `eval` and other mechanisms, alongside potential path traversal issues in `.claude/skills/gstack/design/prototype.ts`. Additionally, the artifact has high severity findings related to data exfiltration via file system access and network egress of secrets.
Concern level assessed by the review: Critical. This is the review's scale, not the registry badge.
Reviewed by gemini-2.5-flash. The model sees the findings, not your code, and cannot change a score.
32 FIND_EXEC_PATTERN
Files: /repo/.claude/skills/gstack/SKILL.md, /repo/.claude/skills/gstack/devex-review/SKILL.md, /repo/.claude/skills/gstack/cso/SKILL.md and 29 more · reported by cisco-skill-scanner
23 opt.nerlo-rules.nerlo-js-secret-to-network-egress
Files: /repo/.claude/skills/gstack/browse/src/cli.ts, /repo/.claude/skills/gstack/browse/src/sidebar-agent.ts, /repo/.claude/skills/gstack/design/prototype.ts and 10 more · reported by nerlo-behavioral
15 AAK-TAINT-003
Files: .claude/skills/gstack/browse/src/server.ts · reported by agent-audit-kit
11 opt.nerlo-rules.nerlo-hardcoded-external-egress
Files: /repo/.claude/skills/gstack/design/prototype.ts, /repo/.claude/skills/gstack/design/src/check.ts, /repo/.claude/skills/gstack/design/src/design-to-code.ts and 6 more · reported by nerlo-behavioral
10 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/.claude/skills/gstack/openclaw/skills/gstack-openclaw-ceo-review/SKILL.md, /repo/.claude/skills/gstack/openclaw/skills/gstack-openclaw-office-hours/SKILL.md, /repo/.claude/skills/gstack/openclaw/skills/gstack-openclaw-investigate/SKILL.md and 7 more · reported by cisco-skill-scanner
8 AAK-TAINT-001
Files: .claude/skills/gstack/browse/src/server.ts · reported by agent-audit-kit
6 AAK-HEALTHCARE-AI-004
Files: .claude/skills/gstack/CHANGELOG.md, .claude/skills/gstack/design-consultation/SKILL.md, .claude/skills/gstack/plan-design-review/SKILL.md and 3 more · reported by agent-audit-kit
5 AAK-SECRET-004
Files: .claude/skills/gstack/scripts/slop-diff.ts, .claude/skills/gstack/supabase/config.sh, .claude/skills/gstack/browse/src/read-commands.ts · reported by agent-audit-kit
5 LOW_ANALYZABILITY
Files: /repo, /repo/.claude/skills/gstack, /repo/.claude/skills/gstack/design-html and 2 more · reported by cisco-skill-scanner
4 AAK-IPI-WILD-CORPUS-001
Files: .claude/skills/gstack/CHANGELOG.md, .claude/skills/gstack/README.md, .claude/skills/gstack/guard/SKILL.md and 1 more · reported by agent-audit-kit
4 ALLOWED_TOOLS_GREP_VIOLATION
Files: /repo/.claude/skills/gstack/repo/.claude/skills/gstack/SKILL.md, /repo/.claude/skills/gstack/freeze/repo/.claude/skills/gstack/freeze/SKILL.md, /repo/.claude/skills/gstack/careful/repo/.claude/skills/gstack/careful/SKILL.md and 1 more · reported by cisco-skill-scanner
4 COMMAND_INJECTION_EVAL
Files: /repo/.claude/skills/gstack/scripts/resolvers/testing.ts · reported by cisco-skill-scanner
3 AAK-SPLUNK-TOKLOG-001
Files: .claude/skills/gstack/design/prototype.ts, .claude/skills/gstack/design/src/auth.ts, .claude/skills/gstack/browse/src/cli.ts · reported by agent-audit-kit
2 AAK-MCP-AUTH-PATHTRAVERSAL-001
Files: .claude/skills/gstack/design/prototype.ts, .claude/skills/gstack/design/src/session.ts · reported by agent-audit-kit
2 ALLOWED_TOOLS_WRITE_VIOLATION
Files: /repo/.claude/skills/gstack/repo/.claude/skills/gstack/SKILL.md, /repo/.claude/skills/gstack/browse/repo/.claude/skills/gstack/browse/SKILL.md · reported by cisco-skill-scanner
2 BINARY_FILE_DETECTED
Files: /repo/.claude/skills/gstack/scripts/app/icon.icns · reported by cisco-skill-scanner
2 EXCESSIVE_FILE_COUNT
Files: /repo/.claude/skills/gstack/., /repo/. · reported by cisco-skill-scanner
2 opt.nerlo-rules.nerlo-dynamic-exec
Files: /repo/.claude/skills/gstack/scripts/host-config-export.ts, /repo/.claude/skills/gstack/scripts/skill-check.ts · reported by nerlo-behavioral
2 opt.nerlo-rules.nerlo-install-run-bundled-artifact
Files: /repo/.claude/skills/gstack/ship/SKILL.md, /repo/.claude/skills/gstack/ship/SKILL.md.tmpl · reported by nerlo-install-instruction
2 UNANALYZABLE_BINARY
Files: /repo/.claude/skills/gstack/scripts/app/icon.icns · reported by cisco-skill-scanner
1 AAK-LEGAL-002
Files: web/package.json · reported by agent-audit-kit
1 AAK-MCP-014
Files: .claude/skills/gstack/browse/src/server.ts · reported by agent-audit-kit
1 AAK-MCP-015
Files: .claude/skills/gstack/browse/src/server.ts · reported by agent-audit-kit
1 AAK-SKILL-003
Files: .claude/skills/gstack/cso/SKILL.md · reported by agent-audit-kit
1 opt.nerlo-rules.nerlo-install-shell-inline-command
Files: /repo/.claude/skills/gstack/ARCHITECTURE.md · reported by nerlo-install-instruction
Showing 25 of 491; the rest are in the per-scanner reports above.