browser-verification

browser-verification is a skill for Claude Code, Codex from srstomp/pokayokay. It costs 46 tokens per session (790 once invoked), scanned A, original, MIT.

A browser-testing guide for checking user-interface changes in a real browser with Playwright or a Chrome extension.

In plain words
What is it for?
For verifying changed HTML, styles, frontend components, templates, and other files that affect what users see in a browser.
Why use it?
It catches visual problems, broken interactions, responsive-layout issues, and browser console errors that code review may miss.

Skill for Claude CodeCodex

Part of the pokayokay plugin — 24 skills, 23 commands, 14 agents, 4 hooks, 1 MCP server shipped together

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/srstomp/pokayokay/browser-verification
Any agent
npx skills add srstomp/pokayokay --skill browser-verification
Clone the repo
git clone --depth 1 https://github.com/srstomp/pokayokay

Made for: Claude Code, Codex.

Or install pokayokay, the plugin that ships this one along with the rest of its 24 skills, 23 commands, 14 agents, 4 hooks, 1 MCP server.

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.

agentmods badge for browser-verification

README.md
[![agentmods](https://agentmods.dev/badge/skills/srstomp/pokayokay/browser-verification.svg)](https://agentmods.dev/skills/srstomp/pokayokay/browser-verification)
Your own site
<a href="https://agentmods.dev/skills/srstomp/pokayokay/browser-verification"><img src="https://agentmods.dev/badge/skills/srstomp/pokayokay/browser-verification.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 790 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00046 $0.00790
Opus 5 $0.00023 $0.00395
Sonnet 5 $0.00009 $0.00158
Haiku 4.5 $0.00005 $0.00079

Measured 4d ago against content hash 4250a633390c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

browser-verification 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 4d ago.

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.

plugins/pokayokay/skills/browser-verification/SKILL.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Browser Verification Skill

Automatically verify UI changes in a real browser after implementation.

When This Skill Is Used

This skill is triggered during the /work workflow after the implementer completes a task that modifies UI-related files. It is NOT a standalone skill - it's integrated into the work loop.

Purpose

Catch visual and functional issues before code review by testing in a real browser. This prevents:

  • CSS issues that look fine in code but break in browser
  • JavaScript errors that only appear at runtime
  • Responsive/layout issues
  • Missing visual elements

Testability Checks

Browser verification only runs when ALL three conditions are met:

1. Browser Tools Available

Must have either:

  • Playwright MCP tools (mcp__plugin_playwright_*)
  • Chrome Extension tools (mcp__claude-in-chrome__*)

2. Server Running

Must have an HTTP server on a dev port (3000-9999) or ability to start one via package.json scripts.

3. Renderable Files Changed

Task must have modified files that affect browser output:

  • .html, .css, .scss, .less
  • .tsx, .jsx, .vue, .svelte
  • Template files (.hbs, .ejs, .pug)
  • Files in components/, views/, ui/, pages/

If any condition fails, verification is silently skipped.

Verification Process

  1. Navigate to the development server
  2. Screenshot the initial state
  3. Analyze the page snapshot for expected elements
  4. Test interactions if the task involves interactive behavior
  5. Check console for JavaScript errors
  6. Report pass/fail with evidence

Advisory Behavior

This is NOT a hard gate. If verification suggests issues but the user believes the implementation is correct:

  • User can provide a reason for skipping
  • Skip reason is logged in task notes
  • Work continues to spec review with warning flag

Configuration

Projects can customize in .pokayokay.json:

{
  "browserVerification": {
    "enabled": true,
    "portRange": [3000, 9999],
    "additionalPaths": ["src/templates/"],
    "excludePaths": ["src/email-templates/"]
  }
}

Read the full file on GitHub · 102 lines

Files

What ships with it

3 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.

  1. 4d ago First seen · 102 lines · 46 tokens per session scan A 4250a633390c

Subscribe to this mod's changes

browser-verification is a skill published in the GitHub repository srstomp/pokayokay (9 stars, last pushed 2mo ago), licensed MIT. It adds 46 tokens to every session and 790 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 2026-08-31.