What is the key difference between Captcha MCP and Shellward?

Captcha MCP belongs to the Security category with local stdio execution, while Shellward belongs to the Security category with local stdio execution.

How do I install Captcha MCP or Shellward in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Captcha MCP and Shellward free or paid?

Captcha MCP operates under a Free / Open Source model (No auth required). Shellward operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Captcha MCP lists 6 tools with 2 views and 1 GitHub stars. Shellward lists 6 tools with 3 views and 136 GitHub stars.

Can I use both Captcha MCP and Shellward together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Captcha MCP vs Shellward

In-depth architectural comparison of the Captcha MCP and Shellward MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Captcha MCP

Security · Local stdio

Quality: 53/100 (Good) | Auth: No auth required

Shellward

Security · Local stdio

Quality: 56/100 (Good) | Auth: No auth required

Verdict Summary: Choose Captcha MCP if you need specialized Security tools running via a local process. Choose Shellward if your workspace requires Security integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Captcha MCP when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: CAPTCHA_URL, HTTP_MODE, PORT.
Primary tools included: Challenge, verify, and status MCP tools, SHA-256 proof-of-work free tier, L402 Lightning payment support.

Explore Captcha MCP Details

Choose Shellward when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: SHELLWARD_MODE, SHELLWARD_LOCALE, SHELLWARD_THRESHOLD, SHELLWARD_BASELINE_PATH.

Feature & Specification Comparison

Specification	Captcha MCP zekebuilds-lab Security	Shellward jnMetaCode Security
Summary	L402 Lightning paywall + Hashcash proof-of-work gate for MCP tool calls. Free tier solves a PoW challenge; paid tier pays a Lightning invoice via self-hosted LNBits. No accounts, no API keys, no third-party SaaS. Drop-in middleware for any MCP server. npx @powforge/captcha-mcp.	AI Agent Security Middleware & MCP Server with 8-layer defense including prompt injection detection, DLP data flow tracking, command blocking, and PII detection. 7 MCP tools, zero dependencies.
Category & Scope

Tools & Capabilities Breakdown

Captcha MCP Tools (6)

Challenge, verify, and status MCP tools

SHA-256 proof-of-work free tier

L402 Lightning payment support

Five-minute HMAC-signed access tokens

Stdio and HTTP Streamable transports

Configurable captcha backend URL

Shellward Tools (6)

Stdio MCP server with local execution

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Captcha MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "zekebuilds-lab-captcha-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@powforge/captcha-mcp"
      ],
      "env": {
        "CAPTCHA_URL": "YOUR_CAPTCHA_URL_HERE",
        "HTTP_MODE": "YOUR_HTTP_MODE_HERE",
        "PORT": "YOUR_PORT_HERE"
      }
    }
  }
}

Shellward Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "jnmetacode-shellward": {
      "command": "npx",
      "args": [
        "-y",
        "shellward"
      ],
      "env": {
        "SHELLWARD_MODE": "YOUR_SHELLWARD_MODE_HERE",
        "SHELLWARD_LOCALE": "YOUR_SHELLWARD_LOCALE_HERE",
        "SHELLWARD_THRESHOLD": "YOUR_SHELLWARD_THRESHOLD_HERE",
        "SHELLWARD_BASELINE_PATH": "YOUR_SHELLWARD_BASELINE_PATH_HERE"
      }
    }
  }
}

Frequently Asked Questions

Captcha MCP is categorized under Security and uses a local stdio subprocess. In contrast, Shellward belongs to Security using local stdio subprocess. Select Captcha MCP when you need capabilities focused on security and Shellward when you require tools for security.

More alternatives to Captcha MCP More alternatives to Shellward Security category hub Canonical compare URL