Courier

Overview

Courier is a Model Context Protocol server that implements a continuity protocol for autonomous AI agents, enabling agent messaging with an SMTP bridge and Lightning Network payments. By exposing its capabilities through the MCP standard, Courier lets AI assistants interact with agent infrastructure and communication tools as callable functions instead of requiring manual integration.

The server runs as a hosted remote endpoint at https://getcourier.dev with no local installation or authentication required. The latest release is v0.1.0, published under the MIT license with source code available at antonioac1/courier on GitHub.

Courier is listed in the AI & Agents category on mcp.site and works with all major MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Courier, claim this listing to verify ownership and keep the information up to date.

Installation

Settings → Connectors → Add custom connector
Name: Courier
URL:  https://getcourier.dev