Actionmcp

Rails Engine with MCP compliant Spec.

ActionMCP is designed for production Rails environments and does not support STDIO transport. STDIO is not included because it is not production-ready and is only suitable for desktop or script-based use cases. Instead, ActionMCP is built for robust, network-based deployments.

What you get

• JSON-RPC 2.0 transport layer
• Capability negotiation during initialization
• Error handling with proper error codes (-32601 for method not found, -32002 for consent required)
• Stateful session management with explicit termination
• Tasks, tools, prompts, resources, completion, logging, sampling, roots, and elicitation message handling

Installing it

# Gemfile
gem "actionmcp"

Details

117 stars on GitHub · MIT licensed · maintained by seuros. Source: https://github.com/seuros/action_mcp