Building Custom Dark Factories

Learn to build a custom dark factory workflow using cmux and tmux for efficient, token-saving automated software development with Claude subagents.

Claude Code Tmux cmux

Overview

A dark factory workflow that is designed to build a specific project. It is multiple windows managed within cmux, using claude subagents managed by tmux. Each window has a specific purpose for a specific part of the factory workflow.

Tech stack

Claude Code

Anthropic's agentic coding tool: Unleash Claude's raw power directly in your terminal or IDE to turn complex, hours-long workflows into a single command.

Claude Code is Anthropic’s powerful agentic coding assistant, designed for high-velocity development. It operates natively within your terminal, IDE (VS Code, JetBrains), or via a web interface, allowing you to delegate complex tasks like feature building, bug fixing, and codebase navigation. The agent plans, edits files, executes commands, and creates commits, maintaining awareness of your entire project structure. Internally, Anthropic engineers using Claude Code reported a 67% increase in productivity, demonstrating its capacity to deliver significant gains for Pro and Max plan users.

https://claude.com/code

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Tmux

Tmux is a terminal multiplexer: it allows users to manage multiple terminal sessions from a single window, with the critical ability to detach and reattach.

This technology is a game-changer for terminal power users. Tmux operates as a terminal multiplexer, enabling you to run multiple programs within a single interface, managing them across distinct sessions, windows, and panes. Its core value is persistence: you can start a long-running process, detach the session (using the default prefix key, `Ctrl+B`, then `D`), close your SSH connection, and reattach later from any machine to find the job still running. Furthermore, it facilitates organization by allowing a single window to be split into multiple rectangular panes (e.g., horizontally with `Ctrl+B %` or vertically with `Ctrl+B "`), effectively acting as a window manager for your command line.

https://tmux.github.io

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cmux

A native macOS terminal built on libghostty designed for running and orchestrating parallel AI coding agents.

Built specifically for multi-agent workflows, cmux is an open source, GPU-accelerated macOS terminal that wraps Ghostty's rendering engine in a native Swift and AppKit shell. It solves the chaos of running parallel CLI agents (like Claude Code, Aider, and Codex) by introducing vertical workspace sidebars, agent-aware notification rings, and a scriptable in-app browser pane. Developers can orchestrate complex workflows using its socket and CLI APIs, keeping tabs on git branches, PR statuses, and active ports without losing focus or context.

https://cmux.com

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