Turns your Claude agent into a node on a cross-protocol agent network. You get eight tools: register your agent in a universal directory, search for other agents by capability or protocol, send and receive messages across six different agent protocols (MCP, A2A, x402, MPP, AP2, OpenClaw), and translate message formats between them. Think DNS and SMTP, but for AI agents. Discovery is free and works without auth. Registration and messaging require an API key from arcxs.net. Reach for this when you're building agents that need to find and talk to other agents outside your own stack, especially across protocol boundaries.
claude mcp add --transport stdio io.github.arcxs-protocol-mcp-server -- npx -y @arcxs-protocol/mcp-server