st0012.dev
I’m Stan Lo, a Ruby committer on Shopify’s Ruby Developer Experience team.
I work on the infrastructure around Ruby development: documentation, REPLs, language tooling, and AI coding workflows.
On the side, I build cctop, a macOS menubar app for monitoring AI coding sessions across Codex, Claude Code, opencode, and pi.
I write about Ruby, open source maintenance, AI coding tools, and the projects behind them.
- ruby/rdoc# documentation tool
- ruby/irb# the REPL
- ruby/reline# line editor
- ruby/ruby# random bits
- st0012/cctop# AI session tracker
- Shopify/rubydex# indexer + MCP
Latest posts
- 2026-10-04 6 min read The developer growth path has dramatically changed How AI agents change our career growth, from less control over our tools to unequal learning opportunities and the cost of learning outside work.
- 2026-09-05 8 min read My chief-centered development workflow in Codex This post explains how I set up a chief thread pattern to help me manage my agentic development workflow.
- 2026-04-10 12 min read Building a Career with Open Source: From User to Maintainer My experience building a career with open source as a non-native English speaker with no CS background. How I picked projects, built trust with maintainers, and made my work visible.
Project updates
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April & May 2026
2026-06-13
This update covers April and May together. In April most of my time went into prototyping and preparing for my RubyKaigi talk, The future of Ruby documentation, so I made less progress on my projec...
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March 2026
2026-04-03
March was a productive month across several projects. On the RDoc side, I focused on making server mode reliable and started work on RBS type signatures in documentation. I also made CI faster in r...
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February 2026
2026-03-08
In February half of my time went into cctop — a macOS menubar app I built for monitoring Claude Code sessions. I have built a workflow around this small utility and improved it continuously. On the...