Nucleus MCP Server
by eidetic-worksio.github.eidetic-works/nucleusv1.15.2
Sovereign Agent OS — Persistent Memory, Governance & Compliance for AI Agents.
context tax
queued
security
queued
cold start
queued
freshness
Active8d ago
Install Nucleus MCP server
Install in Claude Code
claude mcp add nucleus -- uvx nucleus-mcpInstall in Cursor
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"nucleus": {
"type": "stdio",
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| NUCLEUS_BRAIN_PATH | — | — | Path to .brain/ directory (defaults to .brain in current directory) |
Remote endpoints
- streamable-http
https://relay.nucleusos.dev/mcp
Freshness
Active — last maintenance signal 8d ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-10-02 · 8d ago · GitHub
Latest release
2026-06-14 · 4mo ago · GitHub · v1.13.1
Package published
no data · npm/PyPI
Registry entry updated
2026-07-19 · 3mo ago · official registry · v1.15.2
FAQ
›How do I install the Nucleus MCP server in Claude Code?
Run: claude mcp add nucleus -- uvx nucleus-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does Nucleus require an API key?
No required environment variables are declared in its published metadata.
›Can I use Nucleus as a remote (hosted) MCP server?
Yes — it offers both a hosted endpoint and a local stdio package.
›Is Nucleus in the official MCP registry?
Yes, as io.github.eidetic-works/nucleus.
Alternatives to Nucleus
Other memory MCP servers.
MemoryActiveKnowledge graph-based persistent memory for maintaining context.
HindsightActiveHindsight: long-term memory for AI agents modeled on human memory.
Codebase MemoryActiveIndexes a repo into a persistent local knowledge graph of functions, classes, call chains, HTTP routes and cross-service links, using tree-sitter and LSP.
CogneeActiveMemory manager for AI apps and agents using graph and vector stores, with ingestion from many data sources.
HonchoActiveMemory that reasons: continual learning for stateful agents. Better context, fewer tokens.
Basic MemoryActiveLocal-first AI memory: a semantic knowledge graph of Markdown files that humans and LLMs both read and write, with optional cloud sync and team workspaces.