Relay

Relay is a model context protocol (MCP) server that acts as a message bus to move information—such as files, code, data, and comments—between Claude Desktop and Claude Code. It enables seamless, user-controlled message passing between the two applications, preserving their separate context windows and strengths. Relay is ideal for users who want to synchronize workflows without manual copy-pasting and wish to keep Desktop (conversational) and Code (execution) sessions decoupled but interoperable. The tool emphasizes explicit user control, minimal surface area, and acts only as a transport layer, not altering messages or agent contexts.