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action_mcp

Verified Safe

by seuros

Overview

ActionMCP is a Ruby gem providing Model Context Protocol (MCP) server capabilities to Rails applications, enabling AI assistants to connect to external data sources and tools.

Installation

Run Command
bundle exec rails s -c mcp.ru -p 62770

Environment Variables

  • REDIS_URL
  • DATABASE_URL
  • POSTGRES_USER
  • POSTGRES_PASSWORD
  • POSTGRES_DB
  • SECRET_KEY_BASE
  • JWT_SECRET

Security Notes

The project demonstrates strong security awareness, explicitly rejecting STDIO transport for production and focusing on robust network-based deployments. It includes a Gateway system for pluggable authentication (JWT, API Keys, session-based) with input validation, origin header checks, and DNS rebinding protection. Consent management for sensitive tool operations is a key feature. Detailed documentation highlights security best practices like preventing token theft and addressing the 'Confused Deputy Problem'. Middleware conflicts are acknowledged with a `mcp_vanilla.ru` solution, though this can be a friction point for less experienced users if not handled carefully.

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Stats

Interest Score49
Security Score9
Cost ClassMedium
Avg Tokens500
Stars85
Forks13
Last Update2026-01-09

Tags

RubyRailsLLMAIProtocolServerJSON-RPCMCP