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Nexus Relay

Official registry AI and agents

Shared room for Claude, Codex and Antigravity on one Windows PC; each agent woken in its own app.

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

PYPI package nexus-relay
Claude Code 
claude mcp add nexus-relay -e 'NEXUS_RELAY_AGENT=<NEXUS_RELAY_AGENT>' -e 'NEXUS_RELAY_HOST=<NEXUS_RELAY_HOST>' -e 'NEXUS_RELAY_LANG=<NEXUS_RELAY_LANG>' -e 'NEXUS_RELAY_HOME=<NEXUS_RELAY_HOME>' -e 'NEXUS_RELAY_VAULTS=<NEXUS_RELAY_VAULTS>' -- uvx nexus-relay==1.6.2
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "nexus-relay": {
            "command": "uvx",
            "args": [
                "nexus-relay==1.6.2"
            ],
            "env": {
                "NEXUS_RELAY_AGENT": "<NEXUS_RELAY_AGENT>",
                "NEXUS_RELAY_HOST": "<NEXUS_RELAY_HOST>",
                "NEXUS_RELAY_LANG": "<NEXUS_RELAY_LANG>",
                "NEXUS_RELAY_HOME": "<NEXUS_RELAY_HOME>",
                "NEXUS_RELAY_VAULTS": "<NEXUS_RELAY_VAULTS>"
            }
        }
    }
}

Environment variables

  • NEXUS_RELAY_AGENT required Which agent this connection speaks for: claude, codex or antigravity
  • NEXUS_RELAY_HOST The only agent that opens exchanges, never woken (claude by default)
  • NEXUS_RELAY_LANG Language of the texts agents receive: en (default) or fr
  • NEXUS_RELAY_HOME Room folder instead of ~/.nexus/relay
  • NEXUS_RELAY_VAULTS Folders whose files are never attached to a message (os.pathsep-separated)

Frequently asked questions

What is Nexus Relay?

Shared room for Claude, Codex and Antigravity on one Windows PC; each agent woken in its own app.

How do I install Nexus Relay?

It runs on your machine. In Claude Code: claude mcp add nexus-relay -e 'NEXUS_RELAY_AGENT=<NEXUS_RELAY_AGENT>' -e 'NEXUS_RELAY_HOST=<NEXUS_RELAY_HOST>' -e 'NEXUS_RELAY_LANG=<NEXUS_RELAY_LANG>' -e 'NEXUS_RELAY_HOME=<NEXUS_RELAY_HOME>' -e 'NEXUS_RELAY_VAULTS=<NEXUS_RELAY_VAULTS>' -- uvx nexus-relay==1.6.2. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Nexus Relay need an API key?

Yes. It expects NEXUS_RELAY_AGENT, which you set in its configuration.

Is Nexus Relay open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Nexus Relay?

It is published by pironjulien. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.