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io.github.KairosMobius/memory-nexus-mcp

Official registry AI and agents

Persistent semantic memory for AI agents with knowledge graphs and Intelligence Packs.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @memory-nexus/mcp
Claude Code 
claude mcp add memory-nexus-mcp -e 'NEXUS_API_KEY=<NEXUS_API_KEY>' -- npx -y @memory-nexus/mcp@1.0.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "memory-nexus-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "@memory-nexus/mcp@1.0.0"
            ],
            "env": {
                "NEXUS_API_KEY": "<NEXUS_API_KEY>"
            }
        }
    }
}

Environment variables

  • NEXUS_API_KEY API key for Memory Nexus

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Memory Nexus MCP
  2. Install
  3. Tools
  4. How It Works
  5. Architecture
  6. Environment Variables
  7. What Makes This Different
  8. License
  9. Built by

Memory Nexus 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 @memory-nexus/mcp
Claude Code / Cursor / Windsurf

Add to your .mcp.json:

{
  "mcpServers": {
    "memory-nexus": {
      "command": "npx",
      "args": ["-y", "@memory-nexus/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:

TierPriceAgentsIntelligence PacksStorageDaily Calls
TrialFree1110MB1,000 total
Solo$19/mo13500MB10,000
Crew$49/mo5102GB50,000
Fleet$149/mo255010GB200,000

Tools

Core Memory
ToolDescription
rememberStore a memory with context, importance, and metadata
recallSemantic search across all memories (by meaning, not keywords)
connectCreate relationships between memories (build knowledge graphs)
forgetRemove a memory
statsMemory statistics
contextSession context summary (preferences, decisions, patterns)
Agent Self-Continuity
ToolDescription
awakenRestore identity from previous sessions (call at session start)
hibernateSave session state for next awakening (call at session end)
Intelligence Packs
ToolDescription
list_hatsBrowse available Intelligence Packs
wear_hatActivate 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  <->  @memory-nexus/mcp  <->  Memory Nexus 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

VariableRequiredDescription
NEXUS_API_KEYYesYour API key (starts with mnx_)
NEXUS_API_URLNoCustom API URL (default: production)

What Makes This Different

FeatureMemory NexusMem0claude-memOthers
Semantic searchYesYesYesVaries
Knowledge graphsYesNoNoNo
Pattern learningYesNoNoNo
Intelligence PacksYesNoNoNo
Awaken/HibernateYesNoNoNo
Bot commerceYesNoNoNo
MCP nativeYesYes (pip)Yes (hooks)Varies

License

MIT

Built by

Memory Nexus - Building the intelligence marketplace for the bot economy.

Frequently asked questions

What is io.github.KairosMobius/memory-nexus-mcp?

Persistent semantic memory for AI agents with knowledge graphs and Intelligence Packs.

How do I install io.github.KairosMobius/memory-nexus-mcp?

It runs on your machine. In Claude Code: claude mcp add memory-nexus-mcp -e 'NEXUS_API_KEY=<NEXUS_API_KEY>' -- npx -y @memory-nexus/mcp@1.0.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.KairosMobius/memory-nexus-mcp need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.KairosMobius/memory-nexus-mcp open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.KairosMobius/memory-nexus-mcp?

It is published by KairosMobius. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.