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MCP verified MIT Self-run

Rails Diff Mcp

mcp-alexzeitler-rails-diff-mcp · by AlexZeitler

MCP server for Rails version diffs

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Install

$ agentstack add mcp-alexzeitler-rails-diff-mcp

✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

Verified badge

Passed review? Show it. Paste this badge into your README — it links to the public security report.

AgentStack Verified badge Links to your public security report.
[![AgentStack Verified](https://agentstack.voostack.com/badges/verified.svg)](https://agentstack.voostack.com/security/report/mcp-alexzeitler-rails-diff-mcp)

Reliability & compatibility

✓ Security review passed
0 installs to date
— no reviews yet
● 3mo ago

Declared compatibility

Claude CodeClaude DesktopCursorWindsurf

Compatibility is declared by the source manifest. End-to-end runtime verification is coming — see below.

Preview Execution monitoring

We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps — measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.

How agent discovery & health will work →
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About

Rails Diff MCP Server

MCP server that exposes Rails version diffs as tools. Data comes from the railsdiff/rails-new-output GitHub repository, where each Rails version is tagged with the output of rails new.

Tools

| Tool | Description | |------|-------------| | list_rails_versions | List all available Rails versions (sorted) | | compare_rails_versions | Compare two versions — returns a list of changed files | | get_file_diff | Get the patch for a specific file between two versions |

Setup

Prerequisites

  • Docker and Docker Compose
  • Optional: GITHUB_TOKEN env var to avoid GitHub API rate limits

Start the server

docker compose up -d

The server listens on http://localhost:8080/mcp with a health check at http://localhost:8080/healthz.

Register in your MCP client

Example for Claude Code:

claude mcp add --transport http rails-diff http://localhost:8080/mcp

Restart your MCP client to pick up the new server.

Development

bun install
bun src/index.ts

The server starts on port 8080 by default. Override with PORT env var.

Configuration

| Env var | Description | Default | |---------|-------------|---------| | PORT | Server listen port | 8080 | | GITHUB_TOKEN | GitHub personal access token (raises API rate limit) | none |

Credits

Built on top of RailsDiff by Andy Stewart and contributors. The diff data comes from railsdiff/rails-new-output.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

Reviews

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Versions

  • v0.1.0 Imported from the upstream source.

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