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.
npx skills add AI-Unified-Process/marketplace --skill browserless-testgit clone --depth 1 https://github.com/AI-Unified-Process/marketplaceWrote 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/skills/ai-unified-process/marketplace/browserless-test)<a href="https://agentmods.dev/skills/ai-unified-process/marketplace/browserless-test"><img src="https://agentmods.dev/badge/skills/ai-unified-process/marketplace/browserless-test/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/skills/ai-unified-process/marketplace/browserless-test"><img src="https://agentmods.dev/badge/skills/ai-unified-process/marketplace/browserless-test.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Data Exfiltration · line 306 Code or instructions that leak agent conversation context to external services, potentially exposing sensitive user interactions.Fix: Remove any code that sends prompts, responses, or session data externally. Preserve user privacy; never exfiltrate conversation content.
- medium Rogue Agent · line 354 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00104 | $0.04011 |
| Opus 5 | $0.00052 | $0.02005 |
| Sonnet 5 | $0.00021 | $0.00802 |
| Haiku 4.5 | $0.00010 | $0.00401 |
Grade A, and why
browserless-test 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 9d 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 — 403 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browserless Test
Instructions
Create Vaadin Browserless unit tests for Vaadin views based on the use case $ARGUMENTS. Browserless Testing executes the UI directly inside the JVM — no browser, no WebDriver, no servlet container.
Browserless Testing is the official, recommended server-side testing framework for Vaadin. It has been free and open source under Apache 2.0 since Vaadin 25.1 (previously the commercial UI Unit Testing add-on). It supersedes the community Karibu Testing library — prefer this skill over /karibu-test for any new test code.
If the Vaadin MCP server (https://mcp.vaadin.com/docs) is configured, use it for documentation lookups; otherwise rely on your own knowledge and the documentation links below. See the MCP setup rule to configure this optional server.
If Tests for This Use Case Already Exist
A diff of the specification change may follow the file path in the arguments. When it is there, it is the definitive list of what changed — work through it change by change. A removed line means the scenario it described was dropped: delete the tests that exist only for it instead of keeping them as passing extras.
Before writing new tests, look for an existing test class for this use case — search for
UC<id>*Test and for methods annotated @UseCase(id = "UC-XXX"). If one exists, update it to
match the current specification instead of creating a second test class:
- Add test methods for scenarios and business rules the spec has gained since the tests were written
- Update existing test methods whose expected values, labels, component captions, or flows the spec has changed
- Delete tests for scenarios the spec no longer contains
- Leave passing tests the spec still requires untouched
- Update the test data (Flyway test migrations) when the spec's data requirements changed
- Run the whole test class afterwards, not only the methods you added
What ships with it
1 file 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.
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.
- 9d ago First seen · 403 lines · 104 tokens per session scan A cd11254205be
browserless-test is a skill published in the GitHub repository AI-Unified-Process/marketplace (123 stars, last pushed 11d ago), licensed Apache-2.0. It adds 104 tokens to every session and 4,011 once invoked, about $0.0005 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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