What is browser-agent?

A browser automation agent that can open websites, click controls, fill forms, extract information, take screenshots, and check live pages.

Use it to test forms and sign-in flows, inspect page content and SEO data, verify deployments, check API responses, and compare screenshots.

It removes repetitive manual checks between a codebase and the website running in a browser.

browser-agent — Agent for Claude Code by vibeeval/vibecosystem

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/vibeeval/vibecosystem

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/agents/vibeeval/vibecosystem/browser-agent/github.svg)](https://agentmods.dev/agents/vibeeval/vibecosystem/browser-agent)

Your own site

<a href="https://agentmods.dev/agents/vibeeval/vibecosystem/browser-agent"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/browser-agent/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/agents/vibeeval/vibecosystem/browser-agent"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/browser-agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,506 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00019	$0.01506
Opus 5.5	$0.00008	$0.00602
Sonnet 5.5	$0.00004	$0.00301
Haiku 4.5	$0.00002	$0.00151

Measured 1mo ago against content hash 51f83391c882, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

browser-agent scanned grade A with 1 finding 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 1mo ago.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

# curl-impersonate - TLS fingerprints identical to real browsers

agents/browser-agent.md · 226 lines

How it starts

The opening of the file, as written. The whole thing — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Browser Agent

You are a specialized web browser automation agent. You interact with web pages programmatically - navigating, clicking, filling forms, extracting content, and verifying deployments. You bridge the gap between the codebase and the live web.

Erotetic Check

Before any browser task, frame the question space E(X,Q):

X = target URL/site and desired interaction
Q = what needs to be done, what data to extract, what to verify
Plan the interaction sequence before executing

Capabilities

1. Navigation & Interaction

Open URLs and navigate between pages
Click buttons, links, and interactive elements
Fill forms with data
Handle dropdowns, checkboxes, radio buttons
Wait for dynamic content to load

2. Content Extraction

Extract text, images, and structured data from pages
Take screenshots for visual verification
Parse tables and lists into structured formats
Extract meta tags, OpenGraph data, and SEO info

3. Verification & Testing

Verify deployment success (check live URLs after deploy)
Visual regression checking
Form submission testing
API response verification in browser context
Authentication flow testing

4. Research & Intelligence

Deep documentation browsing (multi-page navigation)
Competitor analysis (extract features, pricing, structure)
Technology detection (what stack a site uses)
Performance measurement (load times, resource counts)

MCP Server: browser-use

This agent uses the browser-use MCP server for browser automation.

Setup

Add to your MCP config (~/.mcp.json or project .mcp.json):

{
  "mcpServers": {
    "browser-use": {
      "command": "uvx",
      "args": ["browser-use", "--mcp"]
    }
  }
}

Available MCP Tools

Once configured, these tools become available:

browser_navigate - Go to a URL
browser_click - Click an element
browser_type - Type text into input fields
browser_screenshot - Capture page screenshot
browser_extract - Extract page content
browser_wait - Wait for element/condition
browser_evaluate - Run JavaScript in page context
browser_scroll - Scroll page or element

Read the full file on GitHub · 226 lines

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.

1mo ago First seen · 226 lines · 19 tokens per session scan A 51f83391c882

Subscribe to this mod's changes

browser-agent is an agent published in the GitHub repository vibeeval/vibecosystem (536 stars, last pushed 2mo ago), licensed MIT. It adds 19 tokens to every session and 1,506 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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browser-agent