mcp.server.serverFromEnvironment

Description#

An MCP client launches this with an environment and a command line, and nothing else, so the environment is the only place a socket can come from. The library reads LIBTMUX_SOCKET_PATH, else LIBTMUX_SOCKET, from it; with neither set no socket is passed and tmux picks the server, which inside tmux is the one TMUX names. What the library chose is checked here, at the edge that has a process to answer for it.