Close the terminal window and every AI conversation inside it dies. A session multiplexer is the layer that stops that from happening — and once your agents run for hours instead of seconds, no AI agent platform works without one. What it is, what switching cost me, and how to start tonight.
Unused seats are rarely a product failure. They are an interface mismatch nobody checked before buying. Four Codex doors run one engine, and fitting ai automation tools to how a person already works beats fitting them to a feature list.
Producing text about a task and finishing the task are different products sold at the same price. Codex ships the second kind, and its thrice-reused name is why search results contradict each other. The definition-of-done test applies to any workflow automation software.
Close the terminal window and every AI conversation inside it dies. A session multiplexer is the layer that stops that from happening — and once your agents run for hours instead of seconds, no AI agent platform works without one. What it is, what switching cost me, and how to start tonight.
When I rebuild one with AI agents, you get the write-up — including the parts that didn't work. No weekly roundup, no "5 tools you need."