Nucleus MCP server by Eidetic Works — persistent memory and governance for Claude, Cursor, Windsurf — file-based, no vendor lock-in.
Setup
Choose your client, copy the config, then fill in any required environment variables.
Local
claude mcp add nucleus -- uvx nucleus-mcp~/.codex/config.toml
[mcp_servers.nucleus]
command = "uvx"
args = ["nucleus-mcp"]
# codex mcp add nucleus -- uvx nucleus-mcp~/.cursor/mcp.json
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}.vscode/mcp.json
{
"servers": {
"nucleus": {
"type": "stdio",
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}claude_desktop_config.json
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"nucleus": {
"command": "uvx",
"args": [
"nucleus-mcp"
]
}
}
}Remote
claude mcp add --transport http nucleus https://relay.nucleusos.dev/mcp~/.codex/config.toml
[mcp_servers.nucleus]
url = "https://relay.nucleusos.dev/mcp"
# codex mcp add nucleus --url https://relay.nucleusos.dev/mcp~/.cursor/mcp.json
{
"mcpServers": {
"nucleus": {
"url": "https://relay.nucleusos.dev/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"nucleus": {
"type": "http",
"url": "https://relay.nucleusos.dev/mcp"
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"nucleus": {
"httpUrl": "https://relay.nucleusos.dev/mcp"
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"nucleus": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://relay.nucleusos.dev/mcp"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"nucleus": {
"url": "https://relay.nucleusos.dev/mcp"
}
}
}