A web-quality testing skill that runs end-to-end browser checks and Lighthouse audits. End-to-end tests simulate complete user journeys, while Lighthouse measures areas such as speed, accessibility, best practices, and search visibility.

Use it for Playwright smoke tests, performance and accessibility audits, SEO checks, best-practices reviews, and guidance for improving Lighthouse scores.

It provides repeatable checks for common website failures across desktop and mobile, including light and dark modes when supported.

tester — Skill for Cursor by erikfiala

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add erikfiala/e2e-tester --skill tester

Clone the repo

git clone --depth 1 https://github.com/erikfiala/e2e-tester

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/erikfiala/e2e-tester/tester/github.svg)](https://agentmods.dev/skills/erikfiala/e2e-tester/tester)

Your own site

<a href="https://agentmods.dev/skills/erikfiala/e2e-tester/tester"><img src="https://agentmods.dev/badge/skills/erikfiala/e2e-tester/tester/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/erikfiala/e2e-tester/tester"><img src="https://agentmods.dev/badge/skills/erikfiala/e2e-tester/tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 590 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00067	$0.00590
Opus 5	$0.00034	$0.00295
Sonnet 5	$0.00013	$0.00118
Haiku 4.5	$0.00007	$0.00059

Measured 8d ago against content hash e3e2d7a22403, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

tester scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/discover_audit_targets.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/skills/tester/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

E2E Playwright + Lighthouse Tester

Use this skill to run reproducible e2e and Lighthouse checks across a target web repo, with discovery-first command selection and clear reporting.

Workflow

Discover first
- Run:
  - python3 .cursor/skills/tester/scripts/discover_audit_targets.py .
  - Optional JSON output: python3 .cursor/skills/tester/scripts/discover_audit_targets.py . --json
- Read discovered package scripts, runner files, and PWA signals before deciding what to run.
Runner selection priority
- Prefer existing npm / pnpm / yarn scripts that already run Playwright and Lighthouse.
- Otherwise use checked-in runner files in common locations (perf/, scripts/, e2e/, tests/).
- Only use ad-hoc npx playwright / npx lighthouse commands if no native runner exists.
Execution matrix
- For Lighthouse, target all slices when technically possible:
  - light-desktop
  - light-mobile
  - dark-desktop
  - dark-mobile
- Attempt categories:
  - performance
  - accessibility
  - best-practices
  - seo
  - pwa (when supported by installed Lighthouse and app signals)
- Prefer preview or production-like mode instead of noisy local dev mode when the repo supports it.
100/100 objective
- Always optimize toward 100/100 in Lighthouse categories and Web Vitals-related audits.
- Do not claim false success; explicitly list blockers and remaining deltas to 100.

Reporting contract

Always report by package/surface:

Commands run, including whether native or adapted.
Playwright findings: failing flows, flaky clues, console/page errors, failed requests, auth blockers.
Lighthouse findings per matrix slice (light-desktop, light-mobile, dark-desktop, dark-mobile).
A dedicated 100/100 gap analysis section with highest impact opportunities.
Explicit coverage gaps (skipped routes, no dark mode, no mobile emulation, missing credentials, unsupported PWA category).

Read the full file on GitHub · 56 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

scripts/discover_audit_targets.py 8.4 KB runs code

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 56 lines · 67 tokens per session scan A e3e2d7a22403

Subscribe to this mod's changes

tester is a skill published in the GitHub repository erikfiala/e2e-tester (2 stars, last pushed 5mo ago), licensed MIT. It adds 67 tokens to every session and 590 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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