JAINE Browser — Multi-Channel Browser Automation Agent Skill

Use when you need to see a web page, verify UI visually, take a screenshot, capture a region of the page, execute JS in a real browser…

Context cost
8.5k tokensestimated from the bundle, loaded when it triggers
Bundle
19 files · 312.8 kB17 scripts among them — read before you run
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Use when you need to see a web page, verify UI visually, take a screenshot, capture a region of the page, execute JS in a real browser, click elements, fill forms, check console errors, or monitor network requests. Triggers on "open in browser", "take screenshot", "capture region", "check if X is aligned", "what does this look like", "захватить область", "run JS", "click button", "fill form", visual verification, UI detail check.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

automationbrowserscreenshot

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md33.2 kB · preview
--- name: look argument-hint: "[URL] [task description]" allowed-tools: ["Bash", "Read"] ---
8# JAINE Browser — Multi-Channel Browser Automation
9
10**Core principle:** See what the user sees. Three channels — CDP WebSocket (primary), AppleScript + DOM injection (fallback), macOS native (screenshot). No extensions needed.
11
12## Quick Invoke (/bulldozer:look [URL [task description]])
13
14**Parse $ARGUMENTS first.** Extract the first URL-shaped token — that is the URL passed to scripts. The remaining text is task description you keep as your own brief; do **not** pass it to launch.sh or cdp.py navigate. A URL-shaped token starts with http://, https://, file://, or matches a host:port/... form. A **bare absolute filesystem path** (starts with /) that **exists** on disk is also URL-shaped — pass it through **as-is** (do NOT hand-prefix file:// yourself). cdp.py navigate/open and launch.sh normalize a bare absolute path to a correctly **percent-encoded** file:// URI via pathlib.as_uri() (so spaces and reserved chars like #, ?, % are handled). Hand-prefixing file:// yourself would bypass that encoding and break such paths. Viewing a just-created local file is a common reason to call this skill; a bare path passed straight to the scripts now works, whereas CDP otherwise rejects it (Cannot navigate to invalid URL) and leaves the browser on the previous page. If $ARGUMENTS contains no URL token, treat the whole string as task description and skip steps 2–3 (browser opens at about:blank).
15
16Example: /bulldozer:look file:///tmp/page.html — проверить рендеринг таблицы →
17- URL = file:///tmp/page.html
18- Task description (your own note, not passed to scripts) = проверить рендеринг таблицы
19
20Why: launch.sh reads $1 verbatim as the URL and cdp.py navigate does the same. Passing the full $ARGUMENTS produces a malformed URL whenever the user adds a description.
21
22**Shared or isolated — route BEFORE any command** (#187 Proposal A; the full
23rationale lives in the "Shared or isolated" section below). Pick the branch
24FIRST — the 9333 status probe belongs INSIDE the 9333 branch, not before the
25decision:
26
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md4,691 words
Files19
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈200
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
8,275
on trigger
The instruction body and 18 supporting files, read only when the skill fires.
4.2%
of a 200k window
Ten skills this size would take about 42% of the window before you open a file.
050k100k150k200k context window

8.5k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md asks for Bash, which can write files and reach the network alike, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

The allowed-tools line of this skill’s own SKILL.md asks for Bash, which could do either, so neither is ruled out. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

19 files, 312.8 kB on disk. Mostly text — the instructions the model reads — with 17 scripts in it that your client would run only if the instructions tell it to.

  • SKILL.md33.2 kB
  • scripts/cdp.py117.8 kB
  • scripts/launch.sh43.0 kB
  • scripts/update-cft.sh3.0 kB
  • scripts/vendor/websocket/__init__.py1.0 kB
  • scripts/vendor/websocket/_abnf.py15.6 kB
  • scripts/vendor/websocket/_app.py23.7 kB
  • scripts/vendor/websocket/_cookiejar.py2.3 kB
  • scripts/vendor/websocket/_core.py21.9 kB
  • scripts/vendor/websocket/_dispatcher.py4.6 kB
  • scripts/vendor/websocket/_exceptions.py2.2 kB
  • scripts/vendor/websocket/_handshake.py6.8 kB
  • scripts/vendor/websocket/_http.py14.7 kB
  • scripts/vendor/websocket/_logging.py2.3 kB
  • scripts/vendor/websocket/_socket.py6.0 kB
  • scripts/vendor/websocket/_ssl_compat.py1.8 kB
  • scripts/vendor/websocket/_url.py5.2 kB
  • scripts/vendor/websocket/_utils.py7.0 kB
  • scripts/vendor/websocket/LICENSE0.7 kB
What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 17 scripts beside the text, so the bundle is 19 files you can review in full before installing.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# JAINE Browser — Multi-Channel Browser Automation · 8.5k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/jaine-browser-multi-channel-browser-automation/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/jaine-browser-multi-channel-browser-automation" ] && { [ ! -e .claude/skills/jaine-browser-multi-channel-browser-automation ] || { mv .claude/skills/jaine-browser-multi-channel-browser-automation "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/jaine-browser-multi-channel-browser-automation" .claude/skills/ && echo "Installed .claude/skills/jaine-browser-multi-channel-browser-automation"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add a3io/jaine-browser-multi-channel-browser-automation

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/jaine-browser-multi-channel-browser-automation/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/jaine-browser-multi-channel-browser-automation/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/jaine-browser-multi-channel-browser-automation" ] && { [ ! -e ~/.claude/skills/jaine-browser-multi-channel-browser-automation ] || { mv ~/.claude/skills/jaine-browser-multi-channel-browser-automation "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/jaine-browser-multi-channel-browser-automation" ~/.claude/skills/ && echo "Installed ~/.claude/skills/jaine-browser-multi-channel-browser-automation" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/jaine-browser-multi-channel-browser-automation/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as look in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, jaine-browser-multi-channel-browser-automation.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencea3io/jaine-browser-multi-channel-browser-automation

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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Who wrote it

A3
A3IO

Publishes on mcprush.

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