Oh it loves to bury a lede.
< mundane detail>
< If you don't run this command your computer will explode>
< exposition >
< mundane reminder to follow up something else >
Then 3 back and forths later, your computer explodes, and claude has the cheek to point out when questioned that it did warn you.
The ‘concise’ output style setting is bad with Opus 5.5, as it will often spit out a cryptic (is this really English?!), allergic-to-commas concise response, which takes more time to parse.