Nucleus MCP Server: Install & Setup

Install Nucleus in Claude Code

Remote URL

Claude Code

claude mcp add --transport http nucleus https://relay.nucleusos.dev/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "nucleus": {
      "url": "https://relay.nucleusos.dev/mcp"
    }
  }
}

PyPI (uv)

Claude Code

claude mcp add nucleus -- uvx nucleus-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "nucleus": {
      "command": "uvx",
      "args": [
        "nucleus-mcp"
      ]
    }
  }
}

Frequently asked questions

What does the Nucleus MCP server do?

Sovereign Agent OS — Persistent Memory, Governance & Compliance for AI Agents.

Is the Nucleus MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Nucleus run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add Nucleus to Claude Code?

Run: claude mcp add --transport http nucleus https://relay.nucleusos.dev/mcp

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