B4n1Web

io.github.B4N1-comPublished by GitHub account B4N1-comv0.12.2Updated Oct 24, 2026

Ultra-lightweight browser engine for AI agents. 33 MCP tools, 4 SDKs, cross-platform.

VerifiedSTDIODesktop onlyWeb Search & ScrapingBrowser Automation

Overview

AI-generated overview

A lightweight headless browser engine that lets an assistant navigate URLs and extract page content such as markdown, links, and screenshots.

What you can do
B4n1Web is a self-contained headless browser engine exposed as an MCP server over stdio, offering 33 tools for agent use. It navigates URLs and extracts structured content including markdown, links, and screenshots, and supports three modes: Light (HTTP fetch plus HTML parsing), JS (script extraction), and Render (full Chromium with screenshots). It also provides domain filtering, safe browsing, and network interception for blocking resources or mocking responses.
When to use it
Use it when an assistant needs to fetch and read web pages, pull structured content from them, or capture screenshots as part of an automated workflow. It suits setups that want a small, dependency-free browser engine rather than a full browser stack.
Requirements
Runs locally as a stdio process; no authentication, environment variables, or headers are declared. Installable via npm, PyPI, or NuGet packages, or as a pre-compiled binary for Linux, macOS, and Windows. Desktop only; no web executable. Render mode uses full Chromium and needs roughly 100MB RAM.
Before you install
The server browses the web on the assistant's behalf, so pages it visits and content it retrieves leave the local machine. Network interception and domain filtering features can block or mock requests, which may change what a page returns. No credentials are requested by the manifest, but review any site-specific access before use.

Installation

In SourceWeft

  1. Open B4n1Web in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

[B4n1Web]

🌐 B4n1Web — Agentic Browser Engine

Ultra-lightweight headless browser for AI agents.

[License] [PyPI] [npm] [NuGet] [Maven Central] [Docs]

[PyPI Downloads/month] [npm Downloads/month] [NuGet Downloads] [GitHub Release] [GitHub Downloads]

Single Rust binary · 4 language SDKs · 33 MCP tools. Navigate URLs, extract structured content (markdown, links, screenshots), and build autonomous agent workflows.

📖 Full documentation: https://B4N1-com.github.io/b4n1-web/book/

🌍 Languages / Idiomas / 语言

🇬🇧 English🇪🇸 Español🇫🇷 Français🇩🇪 Deutsch🇵🇹 Português🇮🇹 Italiano
🇨🇳 简体中文🇯🇵 日本語🇰🇷 한국어🇷🇺 Русский🇸🇦 العربية🇮🇳 हिन्दी

🖥 Platform Support

8 pre-compiled binaries — works everywhere:

PlatformArchitecturesBinary
Linuxx86_64, aarch64, i686musl (static, no glibc)
macOSx86_64, arm64universal
Windowsx86_64, arm64MSVC

Quick Start

bash
# Install the binarycurl -sL https://raw.githubusercontent.com/B4N1-com/b4n1-web/master/scripts/install.sh | bash
# Or use your preferred package managerpip install b4n1-webnpm install b4n1-webdotnet add package B4n1Web# Java: add dependency from Maven Central
python
from b4n1web import AgentBrowser
browser = AgentBrowser()page = browser.goto("https://example.com")print(page.markdown)browser.close()

MCP Server

bash
# stdio mode (default)b4n1web mcpnpx b4n1-web mcpuvx b4n1-web mcp

SDK Matrix

LanguagePackageVersionBinary
Pythonb4n1-web0.16.0Bundled (musl)
JavaScript/TypeScriptb4n1-web0.16.0Bundled (musl)
Javacom.b4n1:b4n1-web0.16.0Bundled (musl)
C# (.NET)B4n1Web0.16.0Bundled (musl)
Rubyb4n1-web0.16.0Resolver (env/system/PATH)
PHPb4n1/b4n1-web0.16.0Resolver (env/system/PATH)
Gob4n1-web/sdks/go0.16.0Resolver (env/system/PATH)

Capability parity

Every method each SDK exposes is tested (see coverage). Surface differs by design: Python additionally ships a full MCP client (b4n1web.mcp), so it covers the whole tool surface; JS/C#/Java/Ruby/PHP/Go wrap the CLI binary (core flows). Cells below are measured against each SDK's actual source (b4n1-web 0.16.0), not aspirational: explicit rounding — ✓ implemented · · not implemented · mcp available through the bundled MCP server.

CapabilityPythonJS/TSC#JavaRubyPHPGo
goto (light / js / render) + page screenshot✓✓✓✓✓✓✓
wait (--wait-for / waitForSelector)✓✓✓✓✓✓✓
click / typeText✓✓✓✓···
links (Page) + find-links-by-text✓✓✓✓✓✓✓
getLinks (browser) / one-shot fetchmcp✓✓····
evaluate (JS execution)✓···✓✓✓
viewport / user-agent / emulate-device✓✓·····
upload / download / frames / cookies✓······
binary version query (bundle == SDK)✓✓✓✓···

Full parity = one MCP client per SDK (JS/CS/Java) — tracked as tasks; the Ruby/PHP/Go interaction gaps (click/type, device emulation, file transfer, cookies/frames) are their own parity tasks.

Browser Modes

ModeDescriptionRAMStartup
LightHTTP fetch + HTML parsing~15MBInstant
JSLight + JavaScript extraction~15MBInstant
RenderFull Chromium + screenshots~100MB~2s

Features

  • 35 MCP tools for AI agent integration
  • 4 language SDKs (Python, JS, Java, C#) with bundled binary
  • Self-contained binary ~12MB, no dependencies
  • Static linking (musl) — works on any Linux, no glibc required
  • Three modes: Light (instant), JS (scripts), Render (Chromium)
  • Security shield: domain filtering, safe browsing
  • Network interception: block resources, mock responses
  • MCP Server: stdio transport, no port needed
  • Link extraction: get_links MCP tools + getLinks() in every SDK (one-shot fetch without a browser instance)
  • --licenses flag: prints the bundled license + third-party notices, no key required

Documentation

Links

License & Commercial Terms

  • Original Source Code: 100% Proprietary and Closed Source (All Rights Reserved by Bani Montoya).
  • Binaries & SDK Tools: Provided under the Business Source License 1.1 (BUSL-1.1).
    • Free Tier: 100% free for development, evaluation, testing, personal projects, and startups with gross annual revenue < $100,000 USD.
    • Mandatory Enterprise B2B License: Required for government agencies, public bidding projects, and enterprises with gross annual revenue >= $100,000 USD.

For Enterprise B2B licensing inquiries, visit https://b4n1.com/licensing or email [email protected].

Source: README.md at commit 1ea39b5

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.12.2LatestSep 16, 2026

Score

40% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.