Rules solve a fundamental limitation: LLMs don't retain memory between completions. Cursor Memories attack the same problem from the other direction — instead of you writing instructions, Cursor learns facts from your conversations and recalls them in future sessions. Memories replaced the earlier Notepads feature (deprecated in late 2025).
| Aspect | Cursor Rules | Cursor Memories |
|---|---|---|
| Purpose | Prescriptive instructions | Descriptive knowledge |
| Tone | "Always do X" / "Never do Y" | "The project uses X" / "User prefers Y" |
| Authoring | You write them (.mdc / AGENTS.md) | Auto-captured from conversations |
| Review | Version-controlled files | Managed from Cursor Settings |
.cursor/rules/*.mdc file or AGENTS.md so it's reviewed and versioned with the code.