n-skills is a curated marketplace for reusable instructions and skills that extend AI coding agents such as Claude Code, Codex, Cursor, and other agents that read AGENTS.md. Users install these workflow, tool, and orchestration packages through native installers or the universal OpenSkills installer. The catalogue plugins and skills are examples of the packages it distributes.
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 agentmods add skills/numman-ali/n-skills/dev-browsernpx skills add numman-ali/n-skills --skill dev-browsergit clone --depth 1 https://github.com/numman-ali/n-skillsWrote 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/numman-ali/n-skills/dev-browser)<a href="https://agentmods.dev/skills/numman-ali/n-skills/dev-browser"><img src="https://agentmods.dev/badge/skills/numman-ali/n-skills/dev-browser.svg" alt="Measured on agentmods" 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 | $0.00084 | $0.00200 |
| Opus 5 | $0.00042 | $0.00100 |
| Sonnet 5 | $0.00017 | $0.00040 |
| Haiku 4.5 | $0.00008 | $0.00020 |
Grade A, and why
dev-browser 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 5d 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.
This is a copy
100% identical to dev-browser — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Dev Browser
A CLI for controlling browsers with sandboxed JavaScript scripts.
Installation
npm install -g dev-browser
dev-browser install
Usage
Run dev-browser --help to learn more.
Named daemon-launched browsers persist by default. For unattended work, --idle-timeout 5m closes each launched browser after inactivity while preserving its profile and login state. The setting never closes Chrome attached with --connect; use --idle-timeout 0 to disable configured cleanup.
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.
- 5d ago First seen · 22 lines · 84 tokens per session scan A 01a5137fdefa
dev-browser is a skill published in the GitHub repository numman-ali/n-skills (1,040 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 84 tokens to every session and 200 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to dev-browser, differing in 0 lines, and is treated as a copy.
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