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Agent skill

Agent Browser

by npc-live in npc-live/clawfirm

Browser automation skill using the agent-browser CLI for EXTERNAL WEBSITES via Chrome/CDP.

No licenceAuto-check passedProductivity & Automation

Install Agent Browser

skills CLI
$ npx skills add npc-live/clawfirm --skill agent-browser -a claude-code

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

GitHub CLI
$ gh skill install npc-live/clawfirm agent-browser --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/npc-live/clawfirm.git skills-src && mkdir -p .claude/skills && cp -r skills-src/app/assets/skills/agent-browser .claude/skills/agent-browser && 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/

Facts

Skill name
agent-browser
GitHub stars
156
Token cost
~1k tokens
SKILL.md length
340 words
Files
5 (incl. references)
Skills in repo
49
Repo updated
First seen
Licence
None found

At a glance

Browser automation skill using the agent-browser CLI for EXTERNAL WEBSITES via Chrome/CDP.

  • Works in 4 steps: Open a URL: agent-browser open → Snapshot interactive elements:… → Interact using refs from the snapshot:… → …
  • The user asks you to interact with websites
  • SKILL.md covers Prerequisites, Core Workflow, Quick Examples and Key Commands, plus 2 more sections
  • Calls npm and brew

What it does

Agent Browser is an agent skill from npc-live/clawfirm. Browser automation skill using the agent-browser CLI for EXTERNAL WEBSITES via Chrome/CDP. Use this skill when the user asks you to interact with websites, fill forms, scrape pages, take screenshots, or test web apps in Chrome. Trigger on phrases like "open this URL", "click the button", "fill the form", "screenshot the page", "scrape the site", "test the login flow", or "browse to". ⚠️ NOT for Clawfirm app UI — use browser-agent (clawfirm-test skill) for that. ⚠️ NOT the same as browser-agent — these are two…

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `references/authentication.md`, `references/commands.md` and `references/session-management.md`).

It sits in Productivity & Automation, covering Browser automation.

When your agent uses it

  • The user asks you to interact with websites
  • Take screenshots
  • Test web apps in Chrome
  • Phrases like open this URL

Example prompts

  • “open this URL”
  • “click the button”
  • “fill the form”
  • “/agent-browser”

Requirements

  • Node.js

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Open a URL: agent-browser open
  2. Snapshot interactive elements: agent-browser snapshot -i
  3. Interact using refs from the snapshot: agent-browser click @e1, agent-browser fill @e2 "text"
  4. Re-snapshot after any page change to get fresh refs

What it can do on your machine

Read from SKILL.md and the folder at commit db435ed. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm
    • brew

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

    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

Agent Browser loads about 1k tokens when it runs, and up to ~4k if it reads all its reference files. Until then it costs about 139 tokens; SKILL.md has 340 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~139
When it runs · the whole SKILL.md, loaded when a task matches
~1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4k

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 340 words (~1,020 tokens).

“A browser automation skill powered by the agent-browser CLI. It controls Chrome/Chromium via CDP and uses compact element refs for fast, token-efficient interactions.”

— opening of SKILL.md by npc-live
name
agent-browser

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files (references) in app/assets/skills/agent-browser of npc-live/clawfirm.

  • SKILL.md
  • references/authentication.md
  • references/commands.md
  • references/session-management.md
  • references/snapshot-refs.md

Open the folder on GitHubat commit db435ed

Compare with similar skills

Agent Browser 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.

Agent Browser compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Agent Browser this skillnpc-live/clawfirm156—~1kAutomated safety check: PassNone
Agent Browserquran/quran.com-frontend-next1.9k41 repos~3.3kAutomated safety check: PassNone
Dev-Browser CLI AutomationSawyerHood/dev-browser6.7k1 repos~455Automated safety check: PassMIT
Camoufox CLIBin-Huang/camoufox-cli3501 repos~4.5kAutomated safety check: PassMIT
BrowserVibiumDev/vibium2.9k—~4.8kAutomated safety check: PassApache-2.0
Use Agent Browser For Airimoeru-ai/airi50k—~1.1kAutomated safety check: PassMIT

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  • Agent Browser

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    2.9k GitHub stars~4.8k tokensUpdated yesterday
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Categories

Questions about Agent Browser

What does Agent Browser do?

Browser automation skill using the agent-browser CLI for EXTERNAL WEBSITES via Chrome/CDP. Agent Browser is an agent skill from npc-live/clawfirm. Browser automation skill using the agent-browser CLI for EXTERNAL WEBSITES via Chrome/CDP.

When should I use Agent Browser?

Agent Browser fits situations like: the user asks you to interact with websites; take screenshots; test web apps in Chrome; phrases like open this URL.

How do I install Agent Browser in Claude Code?

Run `npx skills add npc-live/clawfirm --skill agent-browser -a claude-code`. Or copy the skill folder (app/assets/skills/agent-browser in npc-live/clawfirm) into .claude/skills/agent-browser in your project. Claude Code loads it when a task matches its description.

How do I install Agent Browser in Codex?

Run `npx skills add npc-live/clawfirm --skill agent-browser -a codex`. Or copy the skill folder (app/assets/skills/agent-browser in npc-live/clawfirm) into .agents/skills/agent-browser in your project. Codex loads it when a task matches its description.

Can I use Agent Browser 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 npc-live/clawfirm --skill agent-browser -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/agent-browser, .gemini/skills/agent-browser, .github/skills/agent-browser and .opencode/skills/agent-browser in your project.

What does Agent Browser need to run?

Going by SKILL.md and its folder, Agent Browser needs the command-line tools its instructions call (npm and brew). Our summary lists: Node.js.

Does Agent Browser access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Agent Browser 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 Agent Browser use?

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

How many tokens does Agent Browser use?

About 1k tokens (SKILL.md is roughly 4.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3k tokens, read only when the agent opens those files.

What are the alternatives to Agent Browser?

Skills that share tags, products or a category with Agent Browser: Agent Browser (quran/quran.com-frontend-next, 1.9k stars), Dev-Browser CLI Automation (SawyerHood/dev-browser, 6.7k stars), Camoufox CLI (Bin-Huang/camoufox-cli, 350 stars) and Browser (VibiumDev/vibium, 2.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Agent Browser?

npc-live (a GitHub organization) maintains it in npc-live/clawfirm, which has 156 GitHub stars. The repository holds 49 skills in this directory. The repository was last updated on June 17, 2026.

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