# When Opus thought it was on Linux

til · 2026-02-11

import PiSessionLink from '@components/content/PiSessionLink.astro';

Got absolutely screwed by Opus thinking it was running on Linux instead of macOS while debugging some CLI stuff with tmux.

But the session of Opus figuring out what happened is pretty fascinating:

<PiSessionLink href="https://pi.dev/session/#e4e931ef32bdd6b727ca38f4053c8a5a" />

Also created a small tool that uses BM25 to find content in previous sessions. It's super useful to just say "I was running a Pi session at the same time, could it be related?" This is completely borrowed from [Amp](https://ampcode.com/news/find-threads).