ZJIT’s optimizer now removes redundant object loads and stores, improving JIT performance of CRuby’s shape system. This post explains how the optimization works.

The Rails Infrastructure team built an open-source benchmarking toolkit to reliably measure Bundler performance improvements, and along the way learned that AI is great for scaffolding tools but engineering rigor — trusting your gut when numbers don’t add up — is something you can’t outsource.

Track CSS, JS & HTML browser support. Get email alerts when features hit your chosen support threshold. Free, no account needed.

Bash is all you need - A nano claude code–like 「agent harness」, built from 0 to 1 - shareAI-lab/learn-claude-code

Build a nano Claude Code-like agent from 0 to 1, one mechanism at a time

Nix に興味があるけど、何から始めたらいいかわからない人のための入門書です。 Homebrew など従来のパッケージ管理の状態から少しずつ Nix 管理に置き換えていく方法を解説します。 Nix を活用するのに必要な知識を体系的にまとめるのを目的としています。 本書は下記レポ

The student asked: “Master, what should I pay more attention to, my tests or my code?”. The master said: “I cannot answer you when you ask the wrong question.” The student thought “oh fuck, here we go again”, but just said: “But master, is it not one or the other?” The master said, “If a bridge is suspended from the pillars. Which is more important the walkway or the pillars?” The student thought for a while and asked: “What about the suspensions?” The master nodded. And the student was enlightened.

The best coverage tool for Ruby code. Contribute to deep-cover/deep-cover development by creating an account on GitHub.

Contribute to kvokka/pr-size-labeler development by creating an account on GitHub.

A high performance Ruby indexer. Contribute to Shopify/rubydex development by creating an account on GitHub.

Practical workflows for Ruby on Rails developers: model selection, RSpec/Minitest, debugging, and CLAUDE.md conventions. From Planet Argon's real experiments.

Easy self-hosting for Docker-based web apps. Contribute to basecamp/once development by creating an account on GitHub.

It’s been 4 years since I quit the Rails core team, so I wanted to mark the occassion and show off all the work I’ve done since then. It’s more...

Aggregating models into value objects with `composed_of`.

A practical guide to Ruby's concurrency primitives beyond fibers, covering Threads, Ractors, and how to achieve true parallel execution in Ruby applications.

Inline expression tracing for Ruby

I thought I was having a spiritual awakening. I was having a psychiatric emergency. I was at a tech conference in Sweden when it started. I hadn't slept in...

Turn any project into a tmux-powered terminal IDE with a simple ide.yml - wavyrai/tmux-ide

Prepare Claude Code agent-team-ready tmux layouts with lead and teammate panes plus the right environment setup.

2026-03-18 TypeScript 7.0を読み解く「uhyo さんに聞く、ネイティブ化の背景とこれから」

Available today is a new recommended controls checklist to help you set configurations and policies when building a resilient cloud foundation.

この1年で、生成AIが自然言語を解釈してブラウザを操作する、Browser UseやPlaywright MCPといった自動テストの仕組みが次々と登場しました。しかし、これらのツールは一体どのようにWebサイトを『見て』、私たちの指示を解釈しているのでしょうか？ 本セッションでは、そのAIの『視点』の正体の1つであるアクセシビリティツリーに焦点を当てます。Playwright MCPのソースコードをベースに、自然言語の指示がどのように解釈され、どのUI要素が特定されるのか、その内部プロセスを見ていきます。また、実際にRailsのシステムテストで使用するCapybaraドライバを作って、Railsとのつなぎの部分についても解説していきます。

コードにはフィードバックループがあるのにドキュメントにはない。Coding Agentと一緒に開発するなかで、ドキュメントをどう整理できそうか考えたことと、試していることをまとめます

Product Security Square #3 ( https://flatt.connpass.com/event/377261/ ) における、CTO米内の講演資料です。

Contribute to pingdotgg/t3code development by creating an account on GitHub.

T3 Code — The best way to code with AI.

tmux-native dashboard for managing Claude Code agents - gavraz/recon

Learn to build with Claude AI through Anthropic's comprehensive courses and training programs.