How do I install the nucleus mcp server?

Use a recorded configuration for your client, replace example credential values and paths, and verify the documented runtime. Restart or reconnect the client, then inspect the available tools.

What credentials does it need?

It reads `NUCLEUS_BRAIN_PATH` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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Nucleus MCP Server

Every AI coding session starts by re-explaining context the last session already knew. `.brain` is a folder in your repo that Claude Code, Cursor

Local serverstdioPython

What is the Nucleus MCP Server?

Every AI coding session starts by re-explaining context the last session already knew. .brain is a folder in your repo that Claude Code, Cursor, and Codex all

What it actually does

GROUND — — Execution verification (5 tiers: diff, syntax, imports, tests, runtime)
ALIGN — — Human corrections (verdict + delta + DPO + event in one call)
Memory — — Engrams that persist across sessions. Write once, recall forever
Sessions — — Save context, resume later. Session arc shows your last 3 sessions
Tasks — — Priority queue with escalation, HITL gates, and heartbeat monitoring
Governance — — Kill switch, compliance configs (EU DORA, MAS TRM, SOC2), audit trails

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

Recorded tools

Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.

Tool	What it does
eu-dora	7 years
sg-mas-trm	5 years
us-soc2	1 year
global-default	90 days

How to install the Nucleus MCP Server

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

From the project documentation. Replace placeholders and example paths before connecting.

Example prompts to try

“Use Nucleus MCP to GROUND.”
“Use Nucleus MCP to ALIGN.”
“Use Nucleus MCP to Memory.”

Frequently asked questions

Every AI coding session starts by re-explaining context the last session already knew. `.brain` is a folder in your repo that Claude Code, Cursor, and Codex all Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.

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