What is fast-browser?

A plugin that adds Playwright-based browser automation to Claude Code and Codex. Playwright is software for controlling web browsers through code.

It helps automate browser interactions, including multi-step flows, page actions, screenshots, recordings, and reusable browser procedures.

It gives coding agents a way to carry out tasks in web pages instead of only reading or generating code.

fast-browser — Plugin for Claude Code by m4ttstack

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.

Clone the repo

git clone --depth 1 https://github.com/m4ttstack/fast-browser

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/m4ttstack/fast-browser/fast-browser/github.svg)](https://agentmods.dev/plugins/m4ttstack/fast-browser/fast-browser)

Your own site

<a href="https://agentmods.dev/plugins/m4ttstack/fast-browser/fast-browser"><img src="https://agentmods.dev/badge/plugins/m4ttstack/fast-browser/fast-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.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/m4ttstack/fast-browser/fast-browser"><img src="https://agentmods.dev/badge/plugins/m4ttstack/fast-browser/fast-browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 7 skills, 1 agent, 1 MCP server cost 301 tokens a session between them.

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.

Security

Grade A, and why

fast-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.

.claude-plugin/plugin.json · 19 lines

What it actually says

{
  "name": "fast-browser",
  "version": "0.1.14",
  "description": "Fast Playwright browser automation for Claude Code and Codex",
  "author": {
    "name": "Matthew Goodwin"
  },
  "license": "MIT",
  "skills": "./skills/",
  "mcpServers": {
    "fast-browser": {
      "command": "node",
      "args": [
        "${CLAUDE_PLUGIN_ROOT}/bin/fast-browser-mcp.mjs"
      ]
    }
  }
}

Contents

What it installs

The manifest is a name and a version. 7 skills, 1 agent, 1 MCP server travel with it, and installing the plugin installs all of them — 301 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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.

today Changed · +8 lines e85c2777c44a
yesterday Changed ad5e2b937cac
3d ago Changed 5334986dac75
5d ago Changed 23b35b4781e7
8d ago Changed f4c6fa8b46c2
17d ago Changed 334a595448d8
18d ago Changed 7efc675ea34f
21d ago Changed 464e893bd3cc
28d ago Changed 610770fdbe92
1mo ago First seen · 11 lines scan A 8396c223bf9b

Subscribe to this mod's changes

fast-browser is a plugin published in the GitHub repository m4ttstack/fast-browser (0 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-31.

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