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 iamzhihuix/happy-claude-skills --skill browsergit clone --depth 1 https://github.com/iamzhihuix/happy-claude-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/iamzhihuix/happy-claude-skills/browser)<a href="https://agentmods.dev/skills/iamzhihuix/happy-claude-skills/browser"><img src="https://agentmods.dev/badge/skills/iamzhihuix/happy-claude-skills/browser/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/iamzhihuix/happy-claude-skills/browser"><img src="https://agentmods.dev/badge/skills/iamzhihuix/happy-claude-skills/browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
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 | $0.00068 | $0.00640 |
| Opus 5 | $0.00034 | $0.00320 |
| Sonnet 5 | $0.00014 | $0.00128 |
| Haiku 4.5 | $0.00007 | $0.00064 |
Grade A, and why
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 12d 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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Tools
Minimal CDP tools for collaborative site exploration and scraping.
Credits: Based on Mario Zechner's article What if you don't need MCP?, adapted from Factory.ai.
Setup
Before first use, install dependencies:
npm install --prefix skills/browser
Start Chrome
./skills/browser/scripts/start.js # Fresh profile
./skills/browser/scripts/start.js --profile # Copy your profile (cookies, logins)
Start Chrome on :9222 with remote debugging.
Navigate
./skills/browser/scripts/nav.js https://example.com
./skills/browser/scripts/nav.js https://example.com --new
Navigate current tab or open new tab.
Evaluate JavaScript
./skills/browser/scripts/eval.js 'document.title'
./skills/browser/scripts/eval.js 'document.querySelectorAll("a").length'
Execute JavaScript in active tab (async context).
IMPORTANT: The code must be a single expression or use IIFE for multiple statements:
- Single expression:
'document.title' - Multiple statements:
'(() => { const x = 1; return x + 1; })()' - Avoid newlines in the code string - keep it on one line
Screenshot
./skills/browser/scripts/screenshot.js
Screenshot current viewport, returns temp file path.
Pick Elements
./skills/browser/scripts/pick.js "Click the submit button"
Interactive element picker. Click to select, Cmd/Ctrl+Click for multi-select, Enter to finish.
Workflow
- Start Chrome with
start.js --profileto mirror your authenticated state. - Drive navigation via
nav.js https://target.appor open secondary tabs with--new. - Inspect the DOM using
eval.jsfor quick counts, attribute checks, or extracting JSON payloads. - Capture artifacts with
screenshot.jsfor visual proof orpick.jswhen you need precise selectors or text snapshots.
What ships with it
6 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.
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.
- 12d ago First seen · 85 lines · 68 tokens per session scan A 8766b8dca2bb
browser is a skill published in the GitHub repository iamzhihuix/happy-claude-skills (306 stars, last pushed 4mo ago), licensed MIT. It adds 68 tokens to every session and 640 once invoked, about $0.0003 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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