Is Crucible safe to use?

Crucible has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Crucible?

Crucible supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Crucible do?

Crucible provides 13 tools: Installation, Usage, Tools, Interaction, Extraction and 8 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Crucible?

Crucible is compatible with claude-desktop, cursor, claude-code. It uses stdio transport.

Is Crucible actively maintained?

Crucible is actively maintained — last commit was 13 days ago. It has 5 GitHub stars.

Crucible

Name: Crucible
Author: joshfng

by joshfng

Ruby MCP server for AI-driven browser automation with stealth mode to evade bot detection, powered by Ferrum

5 13 tools GitHub

No known CVEs

MIT license

Actively maintained

Last commit 13d ago

Works with most clients

Transport: stdio

13 tools · ~369 tok

Grade A · 0.2% of 200K ctx

Edit this pageView history

Browser

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "crucible": {
      "args": [
        "--config",
        "~/.config/crucible/config.yml"
      ],
      "command": "crucible"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/crucible)](https://mcppedia.org/s/crucible)

Read me

What Crucible does

A Ruby MCP (Model Context Protocol) server for browser automation using Ferrum and headless Chrome. Provides 29 tools that AI agents can use to control browsers, with built-in stealth mode to evade bot detection.

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

71/100across 5 weighted dimensions

How we score →

0255075100

−29

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (13)

Click any tool to inspect its schema.

~369 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Crucible safe to use?: Crucible has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Crucible?: Crucible supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Crucible do?: Crucible provides 13 tools: Installation, Usage, Tools, Interaction, Extraction and 8 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Crucible?: Crucible is compatible with claude-desktop, cursor, claude-code. It uses stdio transport.
Is Crucible actively maintained?: Crucible is actively maintained — last commit was 13 days ago. It has 5 GitHub stars.

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MCP Security Weekly

Get CVE alerts and security updates for Crucible and similar servers.

Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Browser

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "crucible": {
      "args": [
        "--config",
        "~/.config/crucible/config.yml"
      ],
      "command": "crucible"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/crucible)](https://mcppedia.org/s/crucible)

Read me

What Crucible does

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

README

Crucible

Installation

gem install crucible

Or from source:

git clone https://github.com/joshfng/crucible.git
cd crucible
bundle install

Usage

Running the Server

# Run with defaults (headless, 1280x720 viewport, 30s timeout)
crucible

# Run with visible browser
crucible --no-headless

# Full options
crucible \
  --no-headless \
  --width 1920 \
  --height 1080 \
  --timeout 60 \
  --chrome /usr/bin/chromium \
  --error-level debug

CLI Options

Option	Description	Default
`-c, --config FILE`	Path to YAML configuration file	auto-detect
`--[no-]headless`	Run browser in headless mode	`true`
`-w, --width WIDTH`	Viewport width in pixels	`1280`
`-h, --height HEIGHT`	Viewport height in pixels	`720`
`--chrome PATH`	Path to Chrome/Chromium executable	auto-detect
`-t, --timeout SECONDS`	Default timeout in seconds	`30`
`--error-level LEVEL`	Logging level (debug/info/warn/error)	`warn`
`--screenshot-format FMT`	Default screenshot format (png/jpeg/base64)	`png`
`--content-format FMT`	Default content format (html/text)	`html`
`--[no-]stealth`	Enable/disable stealth mode	`true`
`--stealth-profile PROFILE`	Stealth profile (minimal/moderate/maximum)	`moderate`
`--stealth-locale LOCALE`	Browser locale for stealth mode	`en-US,en`

Claude Code Integration

gem install crucible

Add to your Claude Code MCP settings (~/.claude/settings.json):

{
  "mcpServers": {
    "crucible": {
      "command": "crucible",
      "args": ["--config", "~/.config/crucible/config.yml"]
    }
  }
}

Tools

Navigation

Tool	Description
`navigate`	Navigate browser to a URL
`wait_for`	Wait for an element to appear
`back`	Navigate back in history
`forward`	Navigate forward in history
`refresh`	Refresh the current page

Interaction

Tool	Description
`click`	Click an element (supports double-click, right-click)
`type`	Type text into an input (with optional clear/submit)
`fill_form`	Fill multiple form fields at once
`select_option`	Select option from dropdown
`scroll`	Scroll page or element into view
`hover`	Hover over an element

Extraction

Tool	Description
`screenshot`	Take screenshot (viewport, full page, or element); save to file or return base64
`get_content`	Get page content (HTML or text)
`pdf`	Generate PDF of the page; save to file or return base64
`evaluate`	Execute JavaScript and return result
`get_url`	Get current page URL

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

71/100across 5 weighted dimensions

How we score →

0255075100

−29

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (13)

Click any tool to inspect its schema.

~369 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Crucible safe to use?: Crucible has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Crucible?: Crucible supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Crucible do?: Crucible provides 13 tools: Installation, Usage, Tools, Interaction, Extraction and 8 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Crucible?: Crucible is compatible with claude-desktop, cursor, claude-code. It uses stdio transport.
Is Crucible actively maintained?: Crucible is actively maintained — last commit was 13 days ago. It has 5 GitHub stars.