Microsoft has released Visual Studio Code 1.129, and the headline change isn’t a new feature so much as a new foundation. The update introduces the agent host, a dedicated process that runs AI coding agents like Copilot, Claude, and Codex outside the editor itself, using a new open protocol called the Agent Host Protocol (AHP). That distinction matters more than it sounds. Until now, agent sessions in VS Code lived inside the extension host, tied to the lifecycle of a single window. Close the window, and the session’s context went with it. The Agent Host Protocol is an open, agent-agnostic protocol between a host and its clients that uses JSON-RPC for communication and immutable state with pure reducers for synchronized session data. In practice, that means an agent session becomes something closer to a resource on a server than a temporary artifact of one editor window. The host owns agent sessions independently of the clients that display and control them, which gives VS...
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