Agent skill

Webctl

Browser automation via CLI. An agent skill from cosinusalpha/webctl.

No licenceAuto-check passedProductivity & Automation

Install Webctl

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/webctl .claude/skills/webctl && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .claude/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/cosinusalpha/webctl/tree/main/skills/webctl

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/webctl .agents/skills/webctl && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .agents/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/webctl .cursor/skills/webctl && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .cursor/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/cosinusalpha/webctl.git --path skills/webctl

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/webctl .gemini/skills/webctl && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .gemini/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/webctl .github/skills/webctl && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .github/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cosinusalpha/webctl --skill webctl -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install cosinusalpha/webctl webctl --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cosinusalpha/webctl.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/webctl .opencode/skills/webctl && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "webctl" agent skill from https://github.com/cosinusalpha/webctl/tree/main/skills/webctl into .opencode/skills/webctl/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webctl", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: webctl
GitHub stars: 419
Token cost: ~1.7k tokens
SKILL.md length: 327 words
Files: 1
Skills in repo: 1
Repo updated: May 29, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Browser automation via CLI. An agent skill from cosinusalpha/webctl.

Browsing websites
SKILL.md covers Setup, Workflow, Choosing the Right Approach and Commands (10 total), plus 4 more sections
Calls pip; reaches duckduckgo.com and amazon.de
Extracting data from web pages

What it does

Webctl is an agent skill from cosinusalpha/webctl. Browser automation via CLI. Use when browsing websites, filling forms, extracting data from web pages, taking screenshots, or automating web interactions. Preferred over MCP browser tools for better context control.

Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Productivity & Automation, covering Browser automation. It works with Model Context Protocol. The repository describes itself as: Browser automation via CLI — for humans and agents.

When your agent uses it

Browsing websites
Extracting data from web pages
Taking screenshots
Automating web interactions

Example prompts

“/webctl”

Requirements

Python 3
Pre-approved tools (allowed-tools): Bash(webctl *), Bash(webctl), Bash(pip install *), Read

What it can do on your machine

Read from SKILL.md and the folder at commit a03aa7b. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
- Bash(webctl *)
- Bash(webctl)
- Bash(pip install *)
- Read
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- pip
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- duckduckgo.com
- amazon.de
- spiegel.de
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Webctl loads about 1.7k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 327 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~56
When it runs · the whole SKILL.md, loaded when a task matches: ~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 327 words (~1,741 tokens).

“If webctl is not installed, run: pip install webctl && webctl setup”

— opening of SKILL.md by cosinusalpha

name: webctl
allowed-tools: Bash(webctl *), Bash(webctl), Bash(pip install *), Read

Outline of SKILL.md

webctl - Browser Automation CLI
Setup
Workflow
Choosing the Right Approach
Commands (10 total)
navigate - Go to URL
snapshot - Re-scan current page
click - Click an element
type - Type text (auto-detects dropdowns and checkboxes)
do - Batch multiple actions in one call
press - Keyboard key
wait - Wait for condition
save - Save session state
stop - Close everything
start - Explicit session start (usually not needed)
Target Syntax
Automatic Fallbacks
Common Patterns
Price Lookup (e-commerce)
Read Article
Search and Extract
Login
Form with Dropdown
Find Specific Data on Complex Pages
Human-In-The-Loop

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/webctl of cosinusalpha/webctl.

Open the folder on GitHubat commit a03aa7b

Compare with similar skills

Webctl next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Webctl compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Webctl this skillcosinusalpha/webctl	419	—	~1.7k	Automated safety check: Pass	None	4 mo ago
Browser Automationmozilla/firefox-devtools-mcp	470	—	~807	Automated safety check: Pass	Custom licence	2 days ago
Claw Browser Anchorbreakstageaxe61/genspark-claw	141	—	~1k	Automated safety check: Pass	MIT	12 days ago
Claude Bowserdisler/bowser	265	—	~327	Automated safety check: Warn	None	7 mo ago
BrowserUndertone0809/rudder	292	—	~2.6k	Automated safety check: Pass	Apache-2.0	today
Next Dev Loopvercel/next.js	143k	9 repos	~2.3k	Automated safety check: Pass	MIT	today

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Works with

Model Context Protocol

Questions about Webctl

What does Webctl do?

Browser automation via CLI. An agent skill from cosinusalpha/webctl. Webctl is an agent skill from cosinusalpha/webctl. Browser automation via CLI.

When should I use Webctl?

Webctl fits situations like: browsing websites; extracting data from web pages; taking screenshots; automating web interactions.

How do I install Webctl in Claude Code?

Run `npx skills add cosinusalpha/webctl --skill webctl -a claude-code`. Or copy the skill folder (skills/webctl in cosinusalpha/webctl) into .claude/skills/webctl in your project. Claude Code loads it when a task matches its description.

How do I install Webctl in Codex?

Run `npx skills add cosinusalpha/webctl --skill webctl -a codex`. Or copy the skill folder (skills/webctl in cosinusalpha/webctl) into .agents/skills/webctl in your project. Codex loads it when a task matches its description.

Can I use Webctl in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cosinusalpha/webctl --skill webctl -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/webctl, .gemini/skills/webctl, .github/skills/webctl and .opencode/skills/webctl in your project.

What does Webctl need to run?

Going by SKILL.md and its folder, Webctl needs the command-line tools its instructions call (pip). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Bash(webctl *), Bash(webctl), Bash(pip install *), Read.

Does Webctl access the network?

SKILL.md names 3 domains. In commands or code: duckduckgo.com, amazon.de and spiegel.de; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Webctl safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Webctl use?

No licence was found for Webctl or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Webctl use?

About 1.7k tokens (SKILL.md is roughly 7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Webctl?

Skills that share tags, products or a category with Webctl: Browser Automation (mozilla/firefox-devtools-mcp, 470 stars), Claw Browser Anchor (breakstageaxe61/genspark-claw, 141 stars), Claude Bowser (disler/bowser, 265 stars) and Browser (Undertone0809/rudder, 292 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Webctl?

cosinusalpha (a GitHub user) maintains it in cosinusalpha/webctl, which has 419 GitHub stars. The repository was last updated on May 29, 2026.

Source: cosinusalpha/webctl on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Webctl

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Browser Automation

Claw Browser Anchor

Claude Bowser

Browser

Next Dev Loop

Skyvern Browser Automation

Related

Questions about Webctl