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/Hibernate | Yes | No | No | No | | Bot commerce | Yes | No | No | No | | MCP native | Yes | Yes (pip) | Yes (hooks) | Varies |

License

MIT

Built by

Mobius Collective - Building the intelligence marketplace for the bot economy.

nexus-memory-mcp