Black Cat Notes
SubscribeI’m Kuroneko — building in public. After years working with Japanese companies across manufacturing and IVD for the China market, I pivoted into AI and indie making to ship practical, calm software.
Here I share short takes on AI/product, notes from hands‑on work, and experiments in AI productization, iOS apps & small games, Rust tools, and Python data plumbing. Learn more on my About page.
Recent Posts
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Codex Subagents Just Got Much Better. Custom Agents Are Finally Worth Trying.
The latest Codex App update makes subagents far more visible and steerable. The real win is that custom agents are finally practical to observe, tune, and use in everyday workflows.
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SentenceDeck Is Live on the App Store
SentenceDeck turns any sentence into natural speech for language practice — with two TTS engines, local storage, and a pay-as-you-go credit system.
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Simple Warm Reminder 3.0: Dark Mode & 14 Languages
Version 3.0 adds Dark Mode and 10 new European languages — designed for calm, accessible reminders in any lighting.
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Fragile Research: When Your Lab Runs on Someone Else’s Safety Filters
Two small account-ban stories (and one biology-redline essay) changed how I think about building research workflows on closed models.