action_mcp and mcp_on_ruby

One is a Rails Engine implementing the Model Context Protocol (MCP) specification, while the other is a Ruby gem providing a general implementation of the same MCP, making them ecosystem siblings where one could potentially leverage the other for its protocol implementation.

action_mcp
53
Established
mcp_on_ruby
36
Emerging
Maintenance 10/25
Adoption 9/25
Maturity 16/25
Community 18/25
Maintenance 2/25
Adoption 9/25
Maturity 15/25
Community 10/25
Stars: 93
Forks: 17
Downloads: —
Commits (30d): 0
Language: Ruby
License: MIT
Stars: 98
Forks: 7
Downloads: —
Commits (30d): 0
Language: Ruby
License: MIT
No Package No Dependents
Stale 6m No Package No Dependents

About action_mcp

seuros/action_mcp

Rails Engine with MCP compliant Spec.

Provides base classes for building MCP servers in Rails with JSON-RPC 2.0 transport, supporting capability negotiation, session management, and change notifications per MCP 2025-06-18 spec. Exposes three core abstractions—Prompt, Tool, and ResourceTemplate—allowing developers to declaratively define LLM-accessible capabilities with built-in validation and consent management for sensitive operations. Designed exclusively for production network deployments; STDIO transport is intentionally excluded in favor of robust server architectures.

About mcp_on_ruby

rubyonai/mcp_on_ruby

💎 A Ruby implementation of the Model Context Protocol

Provides a Rails-native DSL for exposing tools and resources to AI clients via the Model Context Protocol, with built-in JSON Schema validation, URI templating, and authentication. Uses HTTP/SSE transport with production-grade security features including DNS rebinding protection and token authentication, integrating directly with Rails generators and middleware for seamless server setup.

Related comparisons

action_mcp and mcp_rails_template action_mcp and mcp-rb action_mcp and vector_mcp

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