Nocturne Memory is a long-term memory server built on the Model Context Protocol (MCP) that enables AI agents to maintain persistent, structured memory across sessions, models, and tools. It stores memories using graph-like namespaces (system://, core://) with SQLite or PostgreSQL backends, supporting rollback and visual inspection. The system positions itself as an alternative to vector-based RAG, allowing agents to retain identity and context without repeated prompt injection. It works as a drop-in replacement for OpenClaw and integrates with any MCP-compatible client including Claude Code, Cursor, Windsurf, and Cline.