Cognitive memory, architecture, 115+ tools, and benchmarks — explore each area in depth.
21 features across input pipeline, memory management, retrieval, and proactive systems. Trust scoring, guard system, and schema migrations.
Explore 21 features →Atkinson-Shiffrin memory model adapted for AI. Three-store flow with sensory register, STM, and LTM. 14 psychology concepts mapped to implementation.
View architecture →Every cognitive operation exposed as MCP tools across 21 categories. Compatible with Claude Code and any MCP client.
Browse all tools →F1 0.588 on LoCoMo (ACL 2024), +55% vs GPT-4 (128K). CPU only. 93.3% adversarial rejection. First MCP server benchmarked.
See results →A detailed walkthrough of the cognitive architecture, memory model, and autonomous processes.
NEXO Brain runs a suite of background scripts that maintain memory health, generate intelligence briefs, and self-repair — all without user input.
Daily Ebbinghaus memory sweep. Weakens unrehearsed memories and promotes surviving STM items to LTM.
Nightly memory cleanup and pruning. Consolidates the day's learning and removes noise while the system is idle.
Morning intelligence brief. Summarizes yesterday's errors, patterns, pending items, and context for the day ahead.
Daily behavioral self-evaluation. Checks for repeated errors, ignored learnings, and drift from the operational codex.
Extracts learning patterns from session histories. Turns individual incidents into reusable prevention rules.
Health monitor and auto-repair. Detects database corruption, stale locks, and process failures, then fixes them.
Recovers missed tasks on Mac boot. If the machine was asleep during scheduled processes, catch-up runs them all.
Checks for new versions and applies updates. Keeps the cognitive engine current without manual intervention.
Lifecycle hooks that automatically capture context at session boundaries and keep background processes alive.
session-start
Generates a briefing with pending tasks, recent session context, and morning intelligence. Your agent starts every session informed.
session-stop
Captures session state, writes the session diary, and logs mental state for continuity. No context lost between sessions.
capture-session
Sensory Register layer (Atkinson-Shiffrin Layer 1). Captures raw session input for attention filtering and memory promotion.
caffeinate-guard
Keeps the Mac awake during nocturnal processes. Ensures cognitive decay, sleep system, and synthesis run to completion.
NEXO Brain builds on ideas from several open-source projects. We're grateful for the research and implementations that inspired specific features.
HyDE query expansion, spreading activation, prediction error gating, memory dreaming, prospective memory
Security pipeline (4-layer memory poisoning defense)
Quarantine queue (trust promotion policy for new facts)
Hook auto-capture (extracting decisions and facts from conversations)
Co-activation reinforcement (memories retrieved together strengthen connections)
Open source, AGPL-3.0 licensed, and built for builders who want their AI to actually remember.