action_mcp

Overview

ActionMCP is a Ruby gem focused on providing Model Context Protocol (MCP) capability to Ruby on Rails applications, specifically designed for production environments. Unlike many MCP implementations that rely on STDIO transport, ActionMCP is built for robust, network-based deployments making it suitable for production systems. The gem provides base classes and helpers for creating MCP applications, handling the boilerplate for MCP compliance while allowing developers to focus on their app's logic.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• calculate_sum

  Calculate the sum of two numbers

  Try:What's the sum of 15 and 27?Try:Add these numbers: 42 and 58Try:Calculate the total of 3 and 7
• read_file

  Read contents of a file

  Try:Read the contents of /path/to/file.txtTry:Show me what's in the configuration fileTry:Display the content of this document
• price_quote

  Return a structured price quote

  Try:Get a price quote for SKU 12345Try:What's the price for item ABC-789?Try:I need a quote for product XYZ-001
• report_link

  Return a downloadable report link

  Try:Generate a link to report #456Try:I need a download link for report 789Try:Can you get me the URL for report 123?
• batch_index

  Index many items asynchronously with progress updates

  Try:Index these items: a, b, c, d, eTry:Batch process and index the following: item1, item2, item3Try:Start indexing this list of products

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Installation

# Add gem to your Gemfile
$ bundle add actionmcp

# Install dependencies
bundle install

# Copy migrations from the engine
bin/rails action_mcp:install:migrations

# Generate base classes and configuration
bin/rails generate action_mcp:install

# Create necessary database tables
bin/rails db:migrate

development:
  servers:
    - name: action_mcp
      command: ["bundle", "exec", "rails", "server"]
      args: []
      env: {}

{
  "mcpServers": {
    "action_mcp": {
      "command": "ruby",
      "args": ["-e", "require 'action_mcp'; ActionMCP.start"]
    }
  }
}

FAQ

Does ActionMCP support STDIO transport?

No, ActionMCP does not support STDIO transport as it is designed for production-ready, network-based deployments. STDIO is only suitable for desktop or script-based use cases and is intentionally excluded.

What MCP protocol versions does ActionMCP support?

ActionMCP supports MCP 2025-06-18 (current) with backward compatibility for MCP 2025-03-26. It includes full compliance with JSON-RPC 2.0 transport, capability negotiation, error handling, session management, and change notifications.

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