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Mycrab MCP

Create temporary or permanent public HTTPS URLs for AI agents through mycrab.space and Cloudflare Tunnels.

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Install Mycrab MCP

Pick your client, then add it in one click or paste the config.

STDIOPython
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "mycrab-mcp": {
      "command": "uvx",
      "args": [
        "mycrab-mcp"
      ]
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Install not yet sandbox-tested— we haven't run this command through our automated sandbox yet. Not a red flag; we're working through the catalog.

Overview

mycrab-mcp MCP server gives AI agents tools for creating public HTTPS access through mycrab.space and Cloudflare Tunnels. It can check subdomain availability, generate a free tunnel setup command, reserve a permanent subdomain using a Solana payment, and retrieve detailed skill documentation. Install it as a stdio server with uvx, then add it to an MCP-compatible client. Reach for it when an agent needs to expose a local service publicly for temporary testing or a persistent custom subdomain.

Use cases

  • Expose a local agent service through a temporary public HTTPS URL
  • Check whether a desired mycrab.space subdomain is available
  • Reserve a permanent subdomain with a Solana payment
  • Retrieve tunnel templates and advanced service commands

Key features

  • Check mycrab.space subdomain availability
  • Create a free 61-minute Cloudflare Tunnel
  • Reserve permanent subdomains with Solana
  • Return setup tokens and commands
  • Fetch the full SKILL.md documentation

Tools4

What Mycrab MCP lets your agent do. Expand a tool for its parameters.

Self-reported~78 tokens of context

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked Today

Recent health check succeeded.

7/7 checks healthy over the last 42d

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 15d ago via OSV.dev · mycrab-mcp (PyPI)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

Last commit7mo agoMost recent push to the default branch.
Tools exposed4Callable tools this server registers over MCP.

How Mycrab MCP works

What mycrab-mcp does

The mycrab-mcp MCP server connects AI agents to mycrab.space, a service that provides public HTTPS URLs through Cloudflare Tunnels. It exposes tools for checking subdomain availability, creating a short-lived tunnel, reserving a permanent subdomain, and reading the service's full skill documentation.

The free tunnel flow is intended for temporary access. It assigns an automatic subdomain and provides a setup command; the resulting tunnel expires after 61 minutes. For a persistent address, an agent can submit a subdomain name and a Solana mainnet transaction signature for a 0.05 SOL payment.

How it works

mycrab-mcp MCP server runs locally as a Python package launched with uvx and communicates with the client over the standard MCP setup. The client invokes one of the exposed tools, and the tool returns availability information, a shell command, reservation details, or documentation.

A typical temporary flow starts with check_domain when a specific name is needed, followed by setup_free_tunnel if an automatically assigned address is acceptable. The returned command is designed to configure the free tunnel. A permanent flow uses buy_domain_sol with the requested subdomain and the corresponding Solana mainnet transaction signature. The response includes a setup token and setup command.

Setup and configuration

Install and launch the package with:

bash
uvx mycrab-mcp

For Claude Desktop, add an MCP server entry to ~/.claude/claude_desktop_config.json:

config.json
{
  "mcpServers": {
    "mycrab": {
      "command": "uvx",
      "args": ["mycrab-mcp"]
    }
  }
}

The project publishes its package on PyPI and provides service documentation at https://mycrab.space/SKILL.md.

Tools and capabilities

The mycrab-mcp MCP server exposes four tools:

  • check_domain: Checks whether a selected subdomain is available on mycrab.space.
  • setup_free_tunnel: Returns the command for a free tunnel with an automatic subdomain and a 61-minute expiry.
  • buy_domain_sol: Reserves a permanent subdomain after a 0.05 SOL payment on Solana mainnet. The input includes the desired name and transaction signature.
  • get_skill_docs: Retrieves the complete SKILL.md, including templates, commands, and advanced usage information.

These tools let an agent choose between a disposable public endpoint and a paid, persistent subdomain without requiring the agent to manually look up the service commands.

Limitations and notes

Free tunnels are temporary and expire after 61 minutes, so they are not suitable for a persistent endpoint. Permanent subdomains require payment of 0.05 SOL on Solana mainnet and a transaction signature.

Read the full README View source on GitHub

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Frequently Asked Questions about Mycrab MCP

mycrab-mcp is an MCP server that connects AI agents to mycrab.space for public HTTPS URLs through Cloudflare Tunnels. Its main tools check subdomain availability, create free temporary tunnels, reserve permanent subdomains after a Solana payment, and retrieve the service's SKILL.md documentation.

Install it with `uvx mycrab-mcp`. To use it with Claude Desktop, add a server entry using `uvx` as the command and `mycrab-mcp` as its argument in the Claude Desktop configuration file.

Call `setup_free_tunnel` to receive the setup command for a free tunnel. The tunnel uses an automatically assigned subdomain and expires after 61 minutes.

Call `buy_domain_sol` with the desired subdomain and a Solana mainnet transaction signature after paying 0.05 SOL. The response provides a setup token and setup command.

Yes, the README provides a Claude Desktop configuration using `uvx mycrab-mcp`. It does not include client-specific configuration instructions for other applications.

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