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Agent skill

Webapp Testing

by codewhale-hq in codewhale-hq/Codewhale

Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence.

MITAuto-check passedTesting & QA

Install Webapp Testing

skills CLI
$ npx skills add codewhale-hq/Codewhale --skill webapp-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install codewhale-hq/Codewhale webapp-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/codewhale-hq/Codewhale.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/tui/assets/skills/webapp-testing .claude/skills/webapp-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
webapp-testing
GitHub stars
41k
Token cost
~150 tokens
SKILL.md length
61 words
Files
1
Skills in repo
63
Repo updated
First seen
Licence
MIT

At a glance

Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence.

  • Works in 5 steps: Start or reuse the local app. → Wait for readiness. → Inspect DOM/console/network. → …
  • Tasks that involve Browser testing
  • SKILL.md covers When to use, Non-goals and Workflow
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Webapp Testing is an agent skill from codewhale-hq/Codewhale. Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence.

Its SKILL.md is about 150 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Browser testing. The repository describes itself as: Open-source coding agent for your terminal, built in Rust and on a journey of continuous community improvement. Issues and PRs welcome. The licence is MIT.

When your agent uses it

  • Tasks that involve Browser testing

Example prompts

  • “/webapp-testing”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Start or reuse the local app.
  2. Wait for readiness.
  3. Inspect DOM/console/network.
  4. Drive the flow from observed state.
  5. Record evidence of pass/fail.

What it can do on your machine

Read from SKILL.md and the folder at commit ad333fd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Webapp Testing loads about 150 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 61 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~150

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from codewhale-hq/Codewhale at commit ad333fd, republished under its MIT licence (© codewhale-hq). 61 words, ~150 tokens.

Download SKILL.mdSave it as .claude/skills/webapp-testing/SKILL.md (or your agent's skills folder).
name
webapp-testing
description
Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence.
invocation
model+user

Webapp Testing

When to use

Use to prove a web app flow works in a real browser/runtime context.

Non-goals

  • Do not claim success from unit tests alone.
  • Do not hardcode fragile selectors without observation.

Workflow

  1. Start or reuse the local app.
  2. Wait for readiness.
  3. Inspect DOM/console/network.
  4. Drive the flow from observed state.
  5. Record evidence of pass/fail.

© codewhale-hq, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/tui/assets/skills/webapp-testing of codewhale-hq/Codewhale.

Open the folder on GitHubat commit ad333fd

Compare with similar skills

Webapp Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Webapp Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Webapp Testing this skillcodewhale-hq/Codewhale41k—~150Automated safety check: PassMIT
Web Application Testinganthropics/skills180k51 repos~966Automated safety check: PassApache-2.0
BrowserStack Live Testinghandsontable/handsontable22k—~950Automated safety check: PassCustom licence
Chrome Tracelayoutit/polycss757—~2kAutomated safety check: PassMIT
Browser Testing With ScreenshotsAgentWorkforce/relay8651 repos~2.2kAutomated safety check: PassApache-2.0
JS-in-HTML Testingliaohch3/claude-tap3.3k—~924Automated safety check: PassMIT

Similar skills

  • Web Application Testing

    anthropics/skills

    Official

    Tests local web applications with Python Playwright scripts, checking frontend behavior, capturing screenshots and reading browser console logs.

    180k GitHub starsUsed in 51 repos~966 tokens
    Testing & QAAuto-check passed

  • BrowserStack Live Testing

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    Opens a live BrowserStack session on a real Android, iOS or desktop browser for a local or public URL, tunneling localhost through Cloudflare when needed.

    22k GitHub stars~950 tokensUpdated today
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  • Chrome Trace

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    Capture and analyze Chrome/Chromium performance traces with Playwright around a concrete browser interaction.

    757 GitHub stars~2k tokensUpdated 1 mo ago
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  • Browser Testing With Screenshots

    AgentWorkforce/relay

    A skill your agent uses when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality

    865 GitHub starsUsed in 1 repo~2.2k tokens
    Testing & QAAuto-check passed

  • JS-in-HTML Testing

    liaohch3/claude-tap

    Tests JavaScript embedded in an HTML file in two layers: pytest checks of the logic ported to Python, and Playwright runs in a real browser for the DOM.

    3.3k GitHub stars~924 tokensUpdated 15 days ago
    Testing & QAAuto-check passed

  • Diff-Driven QA

    Skyvern-AI/skyvern

    Reads your git diff, decides whether the change needs browser QA, API checks or repo tests, runs that validation and reports pass or fail with evidence.

    23k GitHub stars~4.7k tokensUpdated today
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  • Sub-Agent Delegation

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Categories

Questions about Webapp Testing

What does Webapp Testing do?

Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence. Webapp Testing is an agent skill from codewhale-hq/Codewhale. Start/reuse a local app, wait for readiness, inspect rendered state/console/network, act from observed selectors, and verify with evidence.

When should I use Webapp Testing?

Webapp Testing fits situations like: tasks that involve Browser testing.

How do I install Webapp Testing in Claude Code?

Run `npx skills add codewhale-hq/Codewhale --skill webapp-testing -a claude-code`. Or copy the skill folder (crates/tui/assets/skills/webapp-testing in codewhale-hq/Codewhale) into .claude/skills/webapp-testing in your project. Claude Code loads it when a task matches its description.

How do I install Webapp Testing in Codex?

Run `npx skills add codewhale-hq/Codewhale --skill webapp-testing -a codex`. Or copy the skill folder (crates/tui/assets/skills/webapp-testing in codewhale-hq/Codewhale) into .agents/skills/webapp-testing in your project. Codex loads it when a task matches its description.

Can I use Webapp Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add codewhale-hq/Codewhale --skill webapp-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/webapp-testing, .gemini/skills/webapp-testing, .github/skills/webapp-testing and .opencode/skills/webapp-testing in your project.

What does Webapp Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Webapp Testing is instructions for the agent only.

Does Webapp Testing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Webapp Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Webapp Testing use?

Webapp Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Webapp Testing use?

About 150 tokens (SKILL.md is roughly 600 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Webapp Testing?

Skills that share tags, products or a category with Webapp Testing: Web Application Testing (anthropics/skills, 180k stars), BrowserStack Live Testing (handsontable/handsontable, 22k stars), Chrome Trace (layoutit/polycss, 757 stars) and Browser Testing With Screenshots (AgentWorkforce/relay, 865 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Webapp Testing?

codewhale-hq (a GitHub organization) maintains it in codewhale-hq/Codewhale, which has 41,067 GitHub stars. The repository holds 63 skills in this directory. The repository was last updated on October 7, 2026.

Source: codewhale-hq/Codewhale on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.