What is webapp-testing?

A toolkit for testing local web applications with Playwright, a tool that controls a browser through code. It can check what the interface does and collect evidence such as screenshots and browser logs.

Use it to test frontend features, investigate browser behavior, capture screenshots, and inspect browser logs.

It helps find broken user-interface behavior without relying only on manual clicking or guessing from source code.

webapp-testing — Skill by Interstellar-code

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.

agentmods

npx agentmods add skills/interstellar-code/claud-skills/webapp-testing

Any agent

npx skills add Interstellar-code/claud-skills --skill webapp-testing

Clone the repo

git clone --depth 1 https://github.com/Interstellar-code/claud-skills

Made for: Claude Code, Codex.

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 980 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown 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	$0.00035	$0.00980
Opus 5	$0.00017	$0.00490
Sonnet 5	$0.00007	$0.00196
Haiku 4.5	$0.00003	$0.00098

Measured yesterday against content hash 466597999e84, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

webapp-testing 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 yesterday.

The scan reads SKILL.md. This mod also ships 4 executable files (examples/console_logging.py, examples/element_discovery.py, examples/static_html_automation.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.

generic-claude-framework/skills/webapp-testing/SKILL.md · 110 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

6 files 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.

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.

yesterday First seen · 110 lines · 35 tokens per session scan A 466597999e84

Subscribe to this mod's changes

webapp-testing is a skill published in the GitHub repository Interstellar-code/claud-skills (17 stars, last pushed 7mo ago), with no licence file. It adds 35 tokens to every session and 980 once invoked, about $0.0002 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 2026-08-30.

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