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gstack

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.

Quality

80%

Does it follow best practices?

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SecuritybySnyk

Low

Low-risk findings worth noting

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tessl review fix ./skills/gstack/.agents/skills/gstack/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

63%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The core browse/QA material is excellent — dense, executable, with well-sequenced workflows and built-in verification — but it is buried in a 668-line monolith where operational boilerplate (telemetry, onboarding prompts, style rules) consumes token budget and the full command reference is inlined rather than split into reference files. Extracting the peripheral protocols and the command reference into separate bundle files would substantially improve both conciseness and progressive disclosure.

Suggestions

Move the ~150-line command reference to a references/COMMANDS.md and keep only the most common commands inline, trimming the body to an overview with well-signaled one-level-deep links.

Extract the operational protocols (telemetry run-last block, contributor-mode template, plan-mode footer) into a shared preamble/reference file so they stop consuming the skill's token budget.

Add brief error-recovery guidance for failed browse commands or assertions (e.g., what to check when a snapshot ref is stale or a goto times out) to close the workflow-clarity gap.

DimensionReasoningScore

Conciseness

Roughly 180 lines of the 668-line body are tangential to the skill's purpose — telemetry onboarding dialogs, the "Boil the Lake" essay intro, proactive-behavior prompting scripts, a "Voice" style section, contributor-mode templates, and a plan-mode footer — which matches anchor 2's 'several unnecessary explanations or padded sections' better than anchor 3's 'mostly efficient'.

2 / 5

Actionability

The QA workflows are fully executable, copy-paste-ready bash ($B goto, $B snapshot -i, $B fill @e3 "$TEST_EMAIL", $B is visible ".dashboard") covering the common cases (login, deployment checks, uploads, dialogs, responsive, chain), and template placeholders (SKILL_NAME, OUTCOME) are explicitly instructed — matching anchor 5.

5 / 5

Workflow Clarity

Sequencing is clear (preamble → SETUP check before any browse command → task workflows) with explicit verification checkpoints (snapshot -D diffs, is assertions, console error checks), but there is no error-recovery guidance for when a command or assertion fails, leaving it at anchor 4 rather than 5.

4 / 5

Progressive Disclosure

No bundle files exist and everything is inlined in one monolithic file: the ~150-line command reference, the telemetry protocol, and contributor-mode templates are content that clearly belongs in separate files, matching anchor 3 ('content that should be separate is inline') despite decent section headers; it avoids anchor 2 because structure and navigation within the file are reasonable.

3 / 5

Total

14

/

20

Passed

Description

88%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description: third-person voice, dense with concrete capabilities, and an explicit 'Use when' clause with natural trigger phrases. The only weaknesses are a couple of missing common trigger variants and mild overlap risk with generic browsing skills on the broadest trigger.

DimensionReasoningScore

Specificity

The description lists ten-plus concrete actions ("Navigate pages, interact with elements, verify state, diff before/after, take annotated screenshots, test responsive layouts, forms, uploads, dialogs, and capture bug evidence") with comprehensive coverage of the skill's capabilities, matching the anchor-5 example's breadth rather than the 'minor gaps' of anchor 4.

5 / 5

Completeness

It clearly answers both questions: the 'what' is the explicit capability list (headless browser, navigate, interact, verify, diff, screenshot), and the 'when' is the explicit "Use when asked to..." clause with concrete trigger phrases — the anchor-5 pattern; it is not anchor 4 because the 'when' is specific rather than improvable.

5 / 5

Trigger Term Quality

"Use when asked to open or test a site, verify a deployment, dogfood a user flow, or file a bug with screenshots" provides good natural-phrase coverage, but common variations like "take a screenshot", "check prod", or "QA this page" are absent, placing it just below the comprehensive synonym coverage of anchor 5.

4 / 5

Distinctiveness Conflict Risk

"dogfood a user flow", "verify a deployment", and "file a bug with screenshots" carve a distinct QA niche, but "open or test a site" is broad enough to overlap with general web-browsing/fetching skills, so it sits between anchors 4 and 5.

4 / 5

Total

18

/

20

Passed

Validation

93%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

skill_md_line_count

SKILL.md is long (669 lines); consider splitting into references/ and linking

Warning

Total

15

/

16

Passed

Repository

valeriibeck-star/claude-skills

Path

skills/gstack/.agents/skills/gstack/SKILL.md

Reviewed

Table of Contents

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