/memory edits the CLAUDE.md files that teach Claude your conventions. It opens the project, user, and personal memory files, toggles auto-memory, and shows what auto-memory has stored. What you write persists across sessions.

Mid-session you settle on a convention that isn’t in the code yet — “use vi.fn(), not jest.fn(), since we migrated to Vitest.” Drop it into project memory and the next session starts already knowing it, instead of suggesting the helper you just dropped.

~/code/api  >  /memory

  Memory files
  ──────────────────────────────────────────────
  ▸ Project   ./CLAUDE.md
    User      ~/.claude/CLAUDE.md
    Personal  ./CLAUDE.local.md

    Auto-memory   on
    ↵ edit   a toggle auto-memory   q quit

I keep project memory short. It’s a place for the non-obvious rules a new engineer would have to be told — not a copy of the docs Claude can already read.