Nexus Memory MCP

Persistent semantic memory for AI agents. Remember everything, recall by meaning, grow smarter over time.

The only memory system with pre-built Intelligence Packs (domain expertise you can activate instantly).

Install

One command. Works with Claude Code, Cursor, Windsurf, or any MCP-compatible client.

npx -y nexus-memory-mcp

Claude Code / Cursor / Windsurf

Add to your .mcp.json:

{
  "mcpServers": {
    "nexus-memory": {
      "command": "npx",
      "args": ["-y", "nexus-memory-mcp"],
      "env": {
        "NEXUS_API_KEY": "mnx_your_api_key_here"
      }
    }
  }
}

Get an API Key

Free trial - 7 days, 1,000 calls, no credit card:

curl -X POST https://memory-api-production-ce4d.up.railway.app/v1/trial/start \
  -H "Content-Type: application/json" \
  -d '{"email":"you@example.com"}'

Or purchase at the Nexus Marketplace:

Tier	Price	Agents	Intelligence Packs	Storage	Daily Calls
Trial	Free	1	1	10MB	1,000 total
Solo	$19/mo	1	3	500MB	10,000
Crew	$49/mo	5	10	2GB	50,000
Fleet	$149/mo	25	50	10GB	200,000

Tools

Core Memory

Tool	Description
remember	Store a memory with context, importance, and metadata
recall	Semantic search across all memories (by meaning, not keywords)
connect	Create relationships between memories (build knowledge graphs)
forget	Remove a memory
stats	Memory statistics
context	Session context summary (preferences, decisions, patterns)

Agent Self-Continuity

Tool	Description
awaken	Restore identity from previous sessions (call at session start)
hibernate	Save session state for next awakening (call at session end)

Intelligence Packs

Tool	Description
list_hats	Browse available Intelligence Packs
wear_hat	Activate a pack (imports expert knowledge into your memory)

How It Works

Remember stores memories with semantic embeddings. Recall finds them by meaning.

Session 1:  remember("Diana prefers bold solutions over phased approaches")
Session 47: recall("how does Diana like things done?")
            -> "Diana prefers bold solutions over phased approaches" (92% match)

Intelligence Packs give your agent instant domain expertise:

list_hats()    -> DevOps Expert (103 memories), TCM Specialist (200+ memories), ...
wear_hat("devops-expert")
recall("how to set up zero-downtime deploys?")
  -> Expert knowledge from 103 curated DevOps memories

Awaken/Hibernate gives your agent identity continuity:

// Start of session
awaken()  -> "I remember. Session 47. I was refactoring the auth module."

// End of session
hibernate({ working_on: "auth refactor", learnings: "JWT refresh tokens need..." })

Architecture

This MCP server is a thin client. All intelligence lives on our servers:

Your Agent  <->  nexus-memory-mcp  <->  Nexus Memory API (Railway)
                 (thin MCP client)      (semantic engine, knowledge graphs,
                                         pattern learning, Intelligence Packs)

Your data is isolated per API key. Multi-tenant, encrypted at rest.

Environment Variables

Variable	Required	Description
NEXUS_API_KEY	Yes	Your API key (starts with mnx_)
NEXUS_API_URL	No	Custom API URL (default: production)

What Makes This Different

Feature	Nexus Memory	Mem0	claude-mem	Others
Semantic search	Yes	Yes	Yes	Varies
Knowledge graphs	Yes	No	No	No
Pattern learning	Yes	No	No	No
Intelligence Packs	Yes	No	No	No
Awaken/Hib

... View full README on GitHub