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metis-browser

metis-browser is a skill for Claude Code, Codex from Wholiver/metis. It costs 82 tokens per session (751 once invoked), scanned A, original, MIT.

A built-in browser control skill for opening local HTML, SVG, and other previewable files, interacting with pages, checking accessibility information, and taking screenshots.

In plain words
What is it for?
Use it to preview local files or development servers, click buttons, fill forms, inspect page state, and capture screenshots after code changes.
Why use it?
It lets an agent verify a user interface in the application's own browser instead of relying on unsupported system-browser commands.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 142repo +4 today A scan 82 tokens original MIT

Good fit Use it to preview local files or development servers, click buttons, fill forms, inspect page state, and capture screenshots after code changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wholiver/metis/metis-browser
View source ↗ Wholiver/metis
Install

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.

Any agent
npx skills add Wholiver/metis --skill metis-browser
Clone the repo
git clone --depth 1 https://github.com/Wholiver/metis

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 metis-browser

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

agentmods 80×15 button for metis-browser

Your own site · 80×15
<a href="https://agentmods.dev/skills/wholiver/metis/metis-browser"><img src="https://agentmods.dev/badge/skills/wholiver/metis/metis-browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 751 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 $0.00082 $0.00751
Opus 5 $0.00041 $0.00376
Sonnet 5 $0.00016 $0.00150
Haiku 4.5 $0.00008 $0.00075

Measured today against content hash 875411d19197, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-17, from the pricing page.

Security

Grade A, and why

metis-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 today.

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.

src/core/builtins/skills/metis-browser/SKILL.md · 55 lines

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.

Metis Browser

Use this skill before any built-in browser automation. Load it with read on this file or /skill:metis-browser.

When to use

  • User asks to open, show, preview, navigate, click, type, fill, scroll, or screenshot a page in Metis Desktop Inspector / 内置浏览器.
  • Local file preview: SVG, HTML, or other browser-viewable workspace files.
  • Local web/dev preview (localhost, 127.0.0.1) that needs real browser interaction.
  • Inspect interactive UI state (buttons, forms, links) after code changes.

Do not use this skill for:

  • Fetching documentation or API text → prefer websearch / webfetch.
  • Opening an external OS browser → never substitute with bash open, open -a Safari, open -a "Google Chrome", xdg-open, or qlmanage when browser_* tools exist.
  • Desktop Computer Use against the Inspector webview → use browser_* tools instead.

Required workflow

  1. Confirm browser_* tools are listed for this session. If they are missing, report that the Desktop browser host is unavailable; do not invent Playwright/Chrome automation and do not use system browsers as a fallback for "内置浏览器".
  2. Prefer this order:
    • browser_navigate (opens/activates Inspector browser tab)
    • browser_snapshot (accessibility / interactive tree with refs)
    • interact with browser_click, browser_fill, browser_type, browser_press_key, or browser_scroll using current ref values
    • snapshot again after every action (refs are session-local and become stale)
  3. Prefer browser_snapshot over browser_take_screenshot. Screenshots are for visual confirmation only.
  4. After editing local app code, reload the page (browser_navigate to the same URL or press reload via tools) before claiming UI is fixed.

Local file / SVG / HTML preview

  • Pass a workspace-relative path (for example pelican_bike.svg), an absolute path, or a file:// URL to browser_navigate.
  • Do not use bash open / Safari / Chrome for preview when the user asked for the built-in browser.
  • After navigate, optionally browser_take_screenshot if a visual check helps; still prefer snapshot when interacting.

Read the full file on GitHub · 55 lines

Files

What ships with it

2 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.

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. today First seen · 55 lines · 82 tokens per session scan A 875411d19197

Subscribe to this mod's changes

metis-browser is a skill published in the GitHub repository Wholiver/metis (142 stars, last pushed today), licensed MIT. It adds 82 tokens to every session and 751 once invoked, about $0.0004 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 2026-09-17.

Browser automationCSS and stylingFrontendagent-orchestrationagent-skillsagentic-workflowai-agentsai-codingcli
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