Fast MCP: A Ruby Implementation of the Model Context Protocol — MCP (Model Context Protocol) servers enable certain LLM-based agents (such as Claude, Claude Code, and Cursor) to perform actions/call tools outside of their usual restricted environment. This library lets you build tools in Ruby which such agents can then reach out to and use.

Yorick Jacquin

Ruby 3.2.8 and 3.1.7 Released — These minor releases fix the vulnerabilities in CGI and URI described here. Ruby 3.1.7 is also considered the final release of the 3.1 series with users encouraged to upgrade to 3.3 or 3.4.

Hiroshi SHIBATA

NEW: Get Real-Time Alerts from Your Logs in Honeybadger — We just shipped a new feature for log management. Alarms allow you to combine a query (“count all slow requests in the past five minutes”) with a threshold (”when count is > 2”) and trigger alerts when the result exceeds the threshold. Read the blog post →

Honeybadger sponsor

Exploring Ruby Ractors — Inspired by some recent posts about Ractors, John set out to see if he could use them to peg his CPU usage (“I paid for 10 cores, I’m gonna use 10 cores”). A fun exploration, including a look at just how much YJIT contributes to the modern Ruby performance story.

John Terry

New Policies to Support the Growth of RubyGems — In response to a potential legal issue that arose around taking down a gem with a possibly trademarked name, Ruby Central is tightening up its official policies which can be read in full here – the policies will take final effect in late May, after a review period.

Marty Haught (Ruby Central)

A Practical Guide to Taming Postgres Isolation Anomalies — A practical, Ruby-themed (though SQL heavy) walkthrough of Postgres’ concurrency control, detailing real-world issues like lost updates, write skew, and other isolation anomalies. Even if you rarely run into conflicts, you’ll come away with valuable insights on managing transactions.

Dan Svetlov

Examples of Value Objects with Ruby's Data Class — We linked to Lucian’s article on value objects last week. He follows up with some useful examples of using them to remove boilerplate code and handle API responses.

Lucian Ghinda

🚀 FastRuby.io Makes Your Rails Upgrade Delightfully Boring with Bonsai — The team behind RailsBump.org offers gradual, 0-downtime upgrades — transform your engineering culture with our experts.

Bonsai | Upgrade Experts sponsor

PicoRuby: A Tiny Ruby Implementation for Microcontrollers — An interesting alternative mruby implementation designed to get its footprint down even smaller to run on small one-chip microcontrollers. Just 256KB of ROM and 128KB of RAM is needed.

HASUMI Hitoshi

RuboCop v1.75.0: The Static Code Analyzer and Formatter — RuboCop gains improved support for Ruby 3.4. As creator Bozhidar Batsov noted on X: “You won’t be able to tell it from the outside, but this release required a ton of work to get to the point where Ruby 3.4 functionality was exposed via Prism’s Parser translation layer.”

Bozhidar Batsov

🐌 If Your Rails Team Needs a Little Boost… — We can augment your team with devs to help you keep up with your delivery schedule. Test us!

SINAPTIA sponsor

Terrapin 1.1: Run Shell Commands Safely — A little extra abstraction for running shell commands that provides safer interpolation, particularly if using user-supplied values.

thoughtbot, inc.