I spotted this on Twitter and read it over the year-end/New Year holidays. Claude CodeによるAI駆動開発入門 amazon.co.jp My vibe coding journey started with Cursor, but since around May of last year, I’ve been almost exclusively using Claude Code. Even writing this blog, I let Claude Code take it from zero to roughly 60% done. I’ve been keeping up with Claude Code by reading and trying out information that flows through Twitter and blog posts, in a mix of relaxation and a sense of urgency. ...

Last month I changed jobs and returned to Rails development after a long time. With a 6-year gap and only one month available for learning, I needed to efficiently grasp Rails 8’s new features and refresh my memory of existing ones. So I decided to learn by building a working app together with Claude Code while referencing the Rails Guides. I temporarily subscribed to Claude Code’s Max plan at USD 100/mo. ...

In recent years, I’ve been mainly writing LookML, SQL, HCL, and other languages, with fewer opportunities to write programming languages like Ruby. However, I’ve recently returned to Rails development this month. So, I finally got around to setting up LSP (Language Server Protocol ) in Emacs. During this process, I also learned about Tree-sitter and configured it as well. ※ LSP is an advanced code assistance mechanism provided by Language Servers, while Tree-sitter is a parsing engine that quickly generates AST from code to enable highlighting and structural editing. ...

Skitch was an app for macOS/Windows/Android/iOS that made it easy to create screenshots with annotations like arrows, text, and shapes. I had been using it for years for work and blog post creation, but since the official site disappeared and it was removed from Homebrew Cask, I switched to Shottr . How Skitch Became Unavailable Over the past 10 years, Skitch’s support has been gradually reduced. 2011/08/18: Evernote acquires Skitch 2015/12/17: Support for Skitch for Windows/Android/iOS ends. Only macOS version continues 2024/03/17: Reports of it becoming unavailable from official site and App Store 2024/06/26: Installation via Homebrew Cask disabled You can still download it from the url listed in Homebrew Cask’s Casks/s/skitch.rb , but I don’t know how long that will last. I realized it was finally time to switch to an alternative tool. ...

Note: This article reflects the setup as of Hugo 0.138.0. I’ve made this blog built with Hugo multilingual. For now, it’s only available in English. https://masutaka.net/ https://masutaka.net/en/ 👈 Why I implemented multilingual support As part of my OSS activities at work, I often cross-post translated articles to platforms like dev.to and Medium. Recently, I’ve been casually translating and cross-posting articles on my own as well. For example, the English translation of [2025-08-15-1] was cross-posted to these three sites: ...

I’ve migrated from Pocket and Hatena Bookmark (Hatebu) , services I had been using for over a decade, to a new bookmarking service: Raindrop.io. I’ve also created helm-raindrop.el so I can comfortably search from Emacs as before. What is Raindrop.io? 🔗 https://raindrop.io/ Raindrop.io is a bookmarking service with a modern design and rich features. Organize bookmarks with collections Tagging and smart filters Full-text search (premium plan only) Browser extensions, mobile apps Integrations with external services like IFTTT and Zapier REST API for developers The backend is proprietary, but everything else is open-source (OSS) and maintained by a single person, Rustem Mussabekov , who lives in Kazakhstan. ...

For casual information gathering, I’ve been running a serverless application called masutaka-feed since 2020. Post GitHub private feeds1 to Mastodon Star and follow notifications are also sent to Pushover Post Hatena Bookmark favorites feeds2 to Mastodon These are pieces of information that aren’t worth subscribing to seriously with a feed reader, but I want to keep them in my field of view. ※ Mastodon posts are made to the private account @[email protected] Previous Architecture Diagram Previously, I used IFTTT’s RSS Feed Integration to detect new items and call Lambda functions via API Gateway. ...

I bought Google’s Fitbit Sense 2 . I got the Platinum Aluminum body with a Lunar White band. I ordered it from the Google Store on Thursday, May 1st, and it arrived on Saturday, May 3rd. This is my first smartwatch since the Amazfit Bip I got back in [2018-01-28-1] . Purchase Price The retail price was ¥32,800, but I had ¥15,000 in Google Store credit from buying a Pixel 9a in [2025-05-04-1] , so I effectively paid ¥17,800. ...

Note: This article reflects the setup as of Hugo 0.138.0. What is llms.txt? llms.txt is a Markdown-formatted text file proposed to address the limitation that LLMs have small context windows and cannot process entire websites. It was proposed on September 3, 2024, by Jeremy Howard of Answer.AI at https://llmstxt.org/ . It is not defined in an RFC like robots.txt. The format includes certain specifications such as the website name in an H1 section, a brief summary, and a list of links in H2 sections. Example: https://llmstxt.org/llms.txt ...

I bought Google’s Pixel 9a and switched from my Pixel 6a [2022-07-30-1] . This is my third Android smartphone after the Pixel 3a XL [2020-07-14-1] . Before that, I had been using iPhones for a full 10 years. The Japan release was announced on April 9 (Wed), and I pre-ordered from the Google Store the same day. It arrived on the release date of April 16 (Wed). Excellent. There was nothing particularly wrong with my Pixel 6a other than slightly declining battery life, but after 3 years, I was curious to see how much things had improved, so I went for it. ...