NEXO Brain is a cognitive AI memory and orchestration server that transforms stateless AI agents into persistent, learning partners with 150+ MCP tools.

Cognitive Memory & RAG

• Semantic retrieval over Short-Term (STM) and Long-Term (LTM) memory stores

• Memory metrics, inspection by ID, Ebbinghaus forgetting curves, and rehearsal-based reinforcement

• Cognitive dissonance detection and resolution

• User sentiment detection, tone guidance, and adaptive trust scoring (0–100)

Session Lifecycle & Multi-Session Coordination

• Register, heartbeat, and cleanly close sessions; list active sessions

• Track files across sessions to detect edit conflicts

• Inter-session messaging: fire-and-forget, broadcast, ask/answer exchanges

Episodic Memory (Changes, Decisions, Diary)

• Log code/config changes with full context; log decisions with reasoning and outcomes

• Write/read end-of-session diaries for continuity

• Unified recall search across all memory types simultaneously

Learnings & Guard System

• Add, search, update, and delete learned patterns, error gotchas, and operational knowledge

• Pre-action guard checks surface relevant learnings before code edits to prevent repeated mistakes

Tasks, Reminders & Followups

• Create, update, complete, and delete user reminders and autonomous followup tasks (with recurrence)

• Log operational task executions and detect overdue tasks

Knowledge & Entity Management

• Store and manage entities (people, services, URLs) and user preferences by category

• Securely store, retrieve, and manage credentials (API keys, tokens) locally in SQLite

Agent Registry

• Register, update, and manage AI agent profiles with specialized models, rules, and toolsets

Evolution & Self-Improvement

• Weekly self-improvement cycles with proposal, approval, and rejection mechanisms

• View evolution dimension scores and history

Data & Search Management

• Database backup, list, and restore

• FTS5 full-text search indexing for directories and files with dynamic directory registration

Extensibility & Operations

• Hot-loadable plugin system with base + personal override directories

• Unified operations menu (nexo_menu) with alerts and active session overview

Scans and analyzes local Git repositories to learn project context, development patterns, and history, incorporating this data into the assistant's long-term memory.