I'm a software developer in Tokyo, building tools for coding agents. My current interests are reproducible agent configurations, coding-agent evaluation, and autonomous development feedback loops.
yuurei — A CLI for running Claude Code, Codex, and OpenCode with isolated configuration profiles, so I can compare setups without replacing my everyday global configuration. It records traces and logs for each run; isolation covers configuration and environment variables, rather than OS-level sandboxing.
Before I Could Evaluate My Coding-Agent Harness, I Had to Isolate It — Why I built yuurei and kept isolation separate from evaluation.
More articles on dev.to · Notes and conversation on X
My student-era portfolio collects my earlier work.
