It's a common enough expression. It has an entry in Wiktionary (sense 2): https://en.wiktionary.org/wiki/do_a_lot_of_work https://en.wiktionary.org/wiki/do_a_l

It's a common enough expression. It has an entry in Wiktionary (sense 2): https://en.wiktionary.org/wiki/do_a_lot_of_work https://en.wiktionary.org/wiki/do_a_lot_of_work A random example from 1991: https://www.google.com/books/edition/Object_oriented_Programming/wRVjgoYUFlUC?hl=en&gbpv=1&bsq=%22is+doing+a+lot+of+work+here%22&dq=%22is+doing+a+lot+of+work+here%22&printsec=frontcover https://www.google.com/books/edition/Object_oriented_Program... Of course Claude picked it up from usage; it didn't invent the phrase. But I don't see any indication that it's uniquely Claude-y. I use the phrase on occasion myself.