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io.github.eidetic-works/nucleus
io.github.eidetic-works/nucleus in the official MCP registry.
Endpoint https://relay.nucleusos.dev/mcp. Source: github.com/eidetic-works/nucleus-mcp.
The registry describes it as: Sovereign Agent OS — Persistent Memory, Governance & Compliance for AI Agents.
We read its 28 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
nucleus_governance nucleus_features nucleus_sessions nucleus_tasks nucleus_sync nucleus_next_message nucleus_relay_subscribe nucleus_ccr_arm nucleus_wakeup_wait nucleus_orchestration nucleus_telemetry nucleus_slots nucleus_infra nucleus_agents nucleus_federation nucleus_engrams nucleus_relay nucleus_route nucleus_audit nucleus_delegate nucleus_lane_init nucleus_lane_start nucleus_lane_stop nucleus_lane_status nucleus_lane_feedback nucleus_plan_execute nucleus_plan_import nucleus_plan_list
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-eidetic-works-nucleus)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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