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Nucleus MCP — Playground

Sovereign Agent OS — Persistent Memory & Governance for AI Agents

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What Nucleus MCP does

Persistent memory and governance for AI coding agents. Local-first .brain/ directory with engrams, audit log, and hypervisor file protection. Optional remote sync to relay.nucleusos.dev. Works across Cursor, Claude Code, Windsurf, and Gemini via Streamable HTTP or stdio. Features: persistent memory, governance, local-first, multi-client, remote sync. Install: pip install nucleus-mcp && nucleus-init --scan

memory
ai-agents
windsurf

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Host Nucleus MCP always-on for $9/mo — no config files, no restarts