This is Claude doing actual research before you write code. It scans your local projects for reusable pieces, reads competitor docs and GitHub issues, mines plugin ecosystems to see what users actually need, and compiles it into a research brief. Three depth levels: focused is 30 minutes for one decision, wide is 1-2 hours to understand a product space, deep is 3-6 hours leaving no stone unturned. The insight is that popular plugins reveal what the core product lacks, and 1-star reviews are a map of unmet needs. Use it when you're about to build something new and want to avoid reinventing wheels or missing obvious patterns.
npx skills add https://github.com/jezweb/claude-skills --skill deep-research