cmux is an open-source terminal multiplexer and agent orchestration harness developed by Manaflow AI. It is designed specifically to streamline agentic workflows, multi-terminal sessions, and CLI-based coding assistants within a unified developer environment. In daily operations, cmux coordinates terminal panes, agent execution, and background development servers. It integrates with terminal emulators such as Ghostty and manages agent skills and execution policies through structured directories (`.agents`, `.claude`). It connects with models like Claude and Codex while supporting local HTTP service routing and TCP pairing listeners for cross-session control. Unlike traditional terminal multiplexers like tmux, cmux is tailored specifically for AI-driven software engineering. It provides structured skill indexes, multi-agent context exposure, and integrated TCP listeners that allow parallel agents to execute shell commands, run test suites, and coordinate without losing developer oversight. cmux is open-source software hosted on GitHub with an active contributor base, multi-platform development tooling, and community sponsorship options.
Tags: cli, coding agent, developer tools, OpenSource, terminal