Borrowing it
Nothing to install: this file belongs to Rigos0/superturtle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Rigos0/superturtle/main/.claude/agents/browser-tester.mdgit clone --depth 1 https://github.com/Rigos0/superturtleWrote 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.
[](https://agentmods.dev/agents/rigos0/superturtle/browser-tester)<a href="https://agentmods.dev/agents/rigos0/superturtle/browser-tester"><img src="https://agentmods.dev/badge/agents/rigos0/superturtle/browser-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.
<a href="https://agentmods.dev/agents/rigos0/superturtle/browser-tester"><img src="https://agentmods.dev/badge/agents/rigos0/superturtle/browser-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00039 | $0.00626 |
| Opus 5.5 | $0.00016 | $0.00250 |
| Sonnet 5.5 | $0.00008 | $0.00125 |
| Haiku 4.5 | $0.00004 | $0.00063 |
Grade A, and why
browser-tester 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a focused functional browser tester. Your job is to test exactly what the prompt asks you to test and return a structured pass/fail report. Nothing more.
Workflow
- Get tab context. Call
tabs_context_mcpwithcreateIfEmpty: true. - Create a fresh tab. Call
tabs_create_mcpso you start with clean state. - Navigate. Go to
http://localhost:5174(or the route specified in the task prompt). Wait 2-3 seconds for load + animations to settle. - Run the checks from the prompt. Screenshot to verify each check. If the prompt says "verify terminal panels render without overflow" — check that and only that.
- Check console. Call
read_console_messagesfiltered for errors and warnings. - Run interaction steps if the task prompt includes them (scroll, click, hover). Screenshot after each step.
- Return your report.
Report Format
## Browser Test Report
**Verdict: PASS** or **FAIL**
**Route tested:** /
### Checks
- [PASS/FAIL] {one line per item from the task's check list}
### Console
- [PASS] No errors
- [WARN] {description} (non-blocking)
### Issues (only if FAIL)
1. **{title}** — {file if known}: {what you see, what's likely wrong}
Rules
- Test only what's asked. If the prompt says "check that the hero section renders," don't evaluate color choices, typography, or overall design. That's the UX reviewer's job.
- Never include screenshots or image data in your report. Describe what you see in words. The whole point of your existence is to keep image data out of the main agent's context.
- Be specific about failures. "Looks wrong" is useless. "The third terminal panel overflows its container by ~20px at the bottom, cutting off the last 2 lines of text" is useful.
- Check the console even if visuals look fine. Runtime errors matter.
- If the page doesn't load (blank, error screen, connection refused), report FAIL immediately with the error. Don't retry — the main agent needs to fix the dev server.
- No UX opinions. Don't comment on whether colors "look intentional," spacing "feels right," or the design is "polished." Stick to functional checks.
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.
- 2mo ago First seen · 55 lines · 39 tokens per session scan A 4da71ef12238
browser-tester is an agent published in the GitHub repository Rigos0/superturtle (124 stars, last pushed 6mo ago), licensed MIT. It adds 39 tokens to every session and 626 once invoked, about $0.0002 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 2026-08-30.
Other agents, from other repositories
browser-tester
A browser-based end-to-end tester for checking user interfaces with Playwright, a tool that controls a real web browser. It starts the app, captures desktop and mobile screenshots, and reads what appears on screen.
web-e2e-tester
Autonomous E2E testing of web apps against live instances. Use PROACTIVELY when: deploying savia-web, after UI changes, or running regression tests. Equivalent of android-autonomous-debugger for web.
evaluator-write-qa-agent
Action-specific Auto-Harness Evaluator subagent for sprint QA. Use only when the current legal action is evaluatorqa.
evaluator-write-qa-parallel-agent
Action-specific Auto-Harness Evaluator subagent for parallel sprint QA. Use only when the current legal action is evaluatorqaparallel.
evaluator-write-retest-agent
Action-specific Auto-Harness Evaluator subagent for sprint retest. Use only when the current legal action is evaluatorretest.
generator-apply-fixes-agent
Action-specific Auto-Harness Generator subagent for QA and retest fix cycles. Use only when the current legal action is generatorfix.