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Rails Diff MCP
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Rails Diff MCP

An MCP server based on Rails version difference data, providing tools to list and compare file changes between Rails versions and obtain difference patches for specific files.
Developer toolsEducation and learning tools#Rails version comparison#File difference analysis#Development tools.TypeScript
2 points
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Overview

Content Details

Alternatives

What is the Rails Diff MCP Server?

This is a tool server specifically designed for Ruby on Rails developers. It allows AI assistants (such as Claude) to access and query file differences between different Rails versions through the Model Context Protocol (MCP). The server fetches data from GitHub repositories, which contain the complete file structure generated by running the `rails new` command for each Rails version, and then provides comparison and analysis functions.

How to use the Rails Diff MCP Server?

You just need to start the server via Docker and then register it in your MCP client (such as Claude Code). After starting, you can directly ask questions to the AI assistant, such as 'What are the differences between Rails 7.0 and 7.1?', and the AI assistant will obtain detailed difference information through this server and explain it to you.

Applicable scenarios

1. When planning to upgrade the Rails version, understand the changes in advance. 2. When learning new features of the Rails version, view the specific implementation differences. 3. When troubleshooting version compatibility issues, compare the changes in configuration files. 4. When teaching or writing documentation, obtain accurate version difference information.

Main features

Version list query
Get a list of all available Rails versions, sorted by version number, to help you understand the range of versions that can be compared.
Version comparison and analysis
Compare any two Rails versions and return a list of all changed files, including newly added, modified, and deleted files.
File difference details
View the specific difference content of a specific file between two versions, displayed in the standard patch format, clearly showing the changes in each line.
One-click deployment
Provide a complete Docker Compose configuration. You can start the service with just one command, without the need for complex development environment configuration.
Advantages
Reliable data source: Based on the official railsdiff/rails-new-output repository, ensuring the accuracy of comparison data.
Easy to use: One-click deployment via Docker, no need to install Ruby or Rails development environment.
Friendly integration: Standard MCP protocol, can be seamlessly integrated with mainstream AI assistants such as Claude.
Fast response: Local deployment, fast query response, not affected by network latency.
Limitations
Dependent on the GitHub API: Data acquisition requires access to GitHub, which may be affected by API rate limits.
Limited to basic comparison: Only compare the basic files generated by `rails new`, does not include application code differences.
Requires an MCP client: Must be used through an MCP-supported client (such as Claude Code).
Data update delay: Dependent on upstream repository updates, may need to wait for data synchronization after a new version is released.

How to use

Environment preparation
Ensure that Docker and Docker Compose are installed on your system. If you need a higher GitHub API call limit, you can prepare a GitHub Personal Access Token.
Start the server
Run the Docker Compose command in the project directory to start the server. The server will run in the background, listening on port 8080.
Register to the MCP client
Add the server configuration in your MCP client (such as Claude Code). Different clients may have different configuration methods.
Restart the client
Restart your MCP client to load the new server configuration. Then you can use the Rails version comparison function through the AI assistant.

Usage examples

Version research before upgrade
When you plan to upgrade your project from Rails 6.1 to 7.0, you can first use this tool to understand all the changes between the two versions and evaluate the upgrade workload and risks.
Learning new version features
When a new version of Rails is released, you can understand what default configurations and file structure changes the new version introduces through comparison.
Troubleshooting configuration issues
When your application behaves differently in different Rails versions, you can find possible reasons by comparing configuration files.

Frequently Asked Questions

Do I need to install Ruby or Rails to use this server?
Is the data up-to-date? How to update it?
Why do I need a GitHub Token?
Which Rails versions are supported?
Can it be used in a production environment?

Related resources

RailsDiff GitHub repository
The original data source and inspiration source of the project
rails-new-output data repository
Contains the original data of the `rails new` output for all Rails versions
Model Context Protocol documentation
The official documentation and specifications of the MCP protocol
Docker installation guide
Installation tutorials for Docker and Docker Compose
Claude Code MCP configuration
How to configure the MCP server in Claude Code

Installation

Copy the following command to your Client for configuration
Note: Your key is sensitive information, do not share it with anyone.

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