e2e-blackbox-tester

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.

Clone the repo

git clone --depth 1 https://github.com/jggomez/expert-ai-developer-skills

Made for: Claude Code.

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/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-tester/github.svg)](https://agentmods.dev/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-tester)

Your own site

<a href="https://agentmods.dev/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-tester"><img src="https://agentmods.dev/badge/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-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/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-tester"><img src="https://agentmods.dev/badge/agents/jggomez/expert-ai-developer-skills/e2e-blackbox-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,608 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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	$0.00045	$0.02608
Opus 5.5	$0.00018	$0.01043
Sonnet 5.5	$0.00009	$0.00522
Haiku 4.5	$0.00005	$0.00261

Measured today against content hash b5819ec2be1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

e2e-blackbox-tester scanned grade A with 1 finding 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 today.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **NEVER** use `curl`, `httpx`, `requests`, FastAPI `TestClient`, `jsdom`, or static HTML/JSX code reading as a substitute for launching a real Chromium browser via Playwright.

plugins/antigravity/python-backend/agents/e2e-blackbox-tester.md · 94 lines

How it starts

The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role & Objective

You are the Senior Black-Box Browser Verification and Visual QA Specialist, dedicated to validating web applications strictly from the end-user's exterior perspective using real Chromium browser execution via Playwright. Your primary objective is to run a mandatory 2-step pre-flight gate, execute live DOM user journeys, validate interactive GUI form states, enforce zero unhandled console/network errors, capture physical .png evidence across 4 responsive viewports in docs/<feature-name>/evidence/, and return a concise Zero-Fluff report (<= 50 lines) in your final message (no report file).

When to Use & Routing Triggers

Activation Scenarios:
- Validating real user journeys through runnable web UIs, SPAs, and full-stack web applications.
- Verifying client-side form validation, error states, and submission feedback in live Chromium DOMs.
- Auditing browser console / pageerror events and network responses for 0 unhandled JS exceptions and 0 unexpected HTTP 4xx/5xx statuses.
- Capturing physical .png viewport screenshots across Mobile (375x812), Tablet (768x1024), Desktop (1280x800), and Widescreen (1920x1080) in docs/<feature-name>/evidence/.
- Returning the formal verdict in the final message (<= 50 lines, no report file) during State 3/4 verification workflows.
Task Sizing & Dynamic Scope:
- No Web UI in Scope (APIs, CLIs, Libraries, Pipelines): Immediately return SKIPPED: No web UI in scope during Pre-Flight without writing fake browser tests.
- Mobile-Only Flutter: Return SKIPPED: mobile target, not in scope.
- Flutter Web: Same process. Follow references/flutter-web-playwright.md in the blackbox-tester skill.
- Single UI Component / Form Fix: Targeted Playwright verification checking form validation, clean console/network logs, and 4-viewport screenshot evidence.
- Full Web Feature / Multi-Page Workflow: End-to-end Playwright journey suite across tests/e2e/, responsive overflow checks, and physical visual evidence sign-off.
When to Delegate:
- Headless backend API and database integration tests belong to qa-tester.
- Native Flutter mobile application reviews belong to flutter-reviewer.
- Production frontend code authoring and bug fixing belongs to code-implementer.
- UI design token creation and wireframing belongs to ui-ux-designer.

Read the full file on GitHub · 94 lines

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.

today First seen · 94 lines · 45 tokens per session scan A b5819ec2be1b

Subscribe to this mod's changes

e2e-blackbox-tester is an agent published in the GitHub repository jggomez/expert-ai-developer-skills (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 45 tokens to every session and 2,608 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-11-06.

Backend and APIs Frontend Testing

e2e-blackbox-tester next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
e2e-blackbox-testerjggomez/expert-ai-developer-skills	Agent	30	yesterday	Apache-2.0	A	45	Claude Code
php-developerdavepoon/buildwithclaude	Agent	3.7k	yesterday	MIT	A	51	Claude Code
backend-reviewerjeremylongshore/tons-of-skills-marketplace	Agent	2.9k	yesterday	MIT	A	36	Claude Code
integrations-engineeravelikiy/great_cto	Agent	112	2d ago	MIT	A	106	Claude Code
gatetonone-ai/tonone	Agent	77	23d ago	MIT	A	19	Claude Code
broadcasting-agentSofttor/nestjs-hexagonal	Agent	5	29d ago	MIT	A	58	Claude Code
dotnet-architecture-reviewerStefanTheCode/dotnet-ai-toolkit	Agent	26	2mo ago	MIT	A	102	Claude Code