Reuse the Extension You Built Once Across Different Agents — Copilot CLI Adopts the Open Plugin Spec and MCP Config, While the Sandbox Moves Toward "Locked by Default"
The latest release of GitHub Copilot CLI can now read the vendor-neutral "Open Plugin Spec" and MCP configuration files. Extensions built for other agents can be carried over as-is, while the default settings for the OS sandbox have moved toward tightening.