VS Code agent host runs Copilot, Claude, and Codex in a dedicated process

Developers who lean on AI coding agents often keep several editor windows open at once, each tied to its own session. The 1.129 release of Visual Studio Code reworks that setup with a dedicated agent host. A dedicated process for agent sessions The agent host is a separate process that runs agent harnesses such as Copilot, Claude, and Codex, built on the Agent Host Protocol.