agent-browser-testing

agent-browser-testing is a skill for Claude Code, Codex from monoes/monomind. It costs 36 tokens per session (9,347 once invoked), scanned A, original, Apache-2.0.

A browser-based testing toolkit for checking user flows and page behaviour through Chrome's debugging connection.

In plain words
What is it for?
It helps navigate pages, find and interact with elements, fill forms, inspect errors and console output, check states, profile performance, and report UI test results.
Why use it?
It lets you inspect pages and produce pass, fail, or warning results without using Playwright or Puppeteer.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is npx monomind browse snapshot -i --save ./baselines/homepage.txt.

Good fit It helps navigate pages, find and interact with elements, fill forms, inspect errors and console output, check states, profile performance, and report UI test results.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/monoes/monomind
agentmods
npx agentmods add skills/monoes/monomind/agent-browser-testing

Made for: Claude Code, Codex.

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 agent-browser-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/monoes/monomind/agent-browser-testing/github.svg)](https://agentmods.dev/skills/monoes/monomind/agent-browser-testing)
Your own site
<a href="https://agentmods.dev/skills/monoes/monomind/agent-browser-testing"><img src="https://agentmods.dev/badge/skills/monoes/monomind/agent-browser-testing/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.

agentmods 80×15 button for agent-browser-testing

Your own site · 80×15
<a href="https://agentmods.dev/skills/monoes/monomind/agent-browser-testing"><img src="https://agentmods.dev/badge/skills/monoes/monomind/agent-browser-testing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,347 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00036 $0.09347
Opus 5.5 $0.00014 $0.03739
Sonnet 5.5 $0.00007 $0.01869
Haiku 4.5 $0.00004 $0.00935

Measured 2d ago against content hash 44e8ae280afc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-browser-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 2d 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.

.agents/skills/agent-browser-testing/SKILL.md · 965 lines

How it starts

The opening of the file, as written. The whole thing — 965 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Browser Testing — Full QA Suite

Engine: npx monomind browse — native TypeScript CDP client. No Playwright, no Puppeteer, no external binary. Every command below goes through this single infrastructure.

CRITICAL RULE: Never use mcp__claude-in-chrome__*, mcp__plugin_playwright__*, or any other browser tool. Always use npx monomind browse.


Commands at a Glance

All 55 subcommands — grouped by what they do.

Group Commands
Open / Navigate open, navigate back|forward|reload, pushstate, connect, close
Inspect snapshot, get url|title|text|html|value|attr|count|box|styles, errors, console
Find find role|text|label|placeholder|testid|alttext|title|selector
Assert is visible|enabled|checked, isvisible, isenabled, ischecked
Click / Tap click, dblclick, tap, hover, focus
Type / Fill fill, type, keyboard type|inserttext, keydown, keyup, press
Form select, check, uncheck, upload
Scroll / Drag scroll, scrollintoview, drag, swipe up|down|left|right
Mouse (raw) mouse move|down|up|wheel
Wait wait --text|--not-text|--url|--selector|--load|--ms|--fn|--download
Download download <ref> <path>, wait --download <path>
Screenshot / PDF screenshot, pdf, highlight, diff url
Clipboard clipboard read|write|copy|paste
Dialogs dialog accept|dismiss|status
Tabs tab list|new|close|<targetId>
Windows window new [url] (isolated context / incognito)
Frames frame <ref>|main
Storage storage local|session, cookies list|set|clear
Network network route|unroute|headers|capture|requests|request
Emulation set device|media|geo|offline|useragent|viewport|credentials, resize
Session state save|load|list|show|clear|rename|clean, open --session|--state
JS / Init eval, eval --stdin, addinitscript, removeinitscript
Record record start|stop|restart|status
Performance vitals, trace start|stop|status, profiler start|stop|heap, har start|stop|status
Batch batch "cmd1" "cmd2" ...

Read the full file on GitHub · 965 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.

  1. 2d ago First seen · 965 lines · 36 tokens per session scan A 44e8ae280afc

Subscribe to this mod's changes

agent-browser-testing is a skill published in the GitHub repository monoes/monomind (23 stars, last pushed 2d ago), licensed Apache-2.0. It adds 36 tokens to every session and 9,347 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-26.