Agent in Your Filesystem. No Installation Needed?

I remember Anthropic releasing Opus 4.8 a couple of months ago and people on Twitter making fun of its inability to tell how many days of the week have the letter d in them. I actually had trouble believing that, thinking these issues would be fixed by now. But no, that was still the case on claude.ai chat: it confidently proclaimed the answer was two—Sunday and Monday! I get how LLMs view words…