Anki

This lets Claude create and manage Anki flashcards through AnkiConnect while you're working. It enforces approval before adding cards (you'll see the front and back of everything first), supports both basic question/answer cards and cloze deletions, and handles markdown with syntax highlighting for code. The guidelines push for atomic cards that test one fact at a time, which is the right nudge if you tend to cram too much into a single card. Works well when you're reading documentation or learning something new and want to convert it into spaced repetition material without leaving your workflow. Requires Anki desktop running in the background.