Doc Coauthoring

It structures the process into three stages: context gathering where you dump everything you know and it asks smart questions, refinement where you brainstorm and build each section iteratively instead of staring at a blank page, and reader testing where a fresh Claude instance reads your doc to catch the gaps you're too close to see. The context gathering phase is especially well done. It pushes you to share background, constraints, and organizational context upfront, and it'll pull from Slack or Google Drive if you have those connected. Good for anything substantial: technical specs, decision docs, RFCs, proposals.