Google Agents CLI 1.8.0 ships Extension System and first-party LangChain extension

Google's Agents CLI now includes an Extension System, introduced in v1.5.0, that lets developers override or add commands without forking the tool, and v1.8.0 ships a first-party LangChain extension. The LangChain template scaffolds a project with no google-adk dependency that deploys to Cloud Run through the same code path as an ADK project, while six ADK-coupled commands such as playground, run and eval generate are replaced or cleanly refused. Extensions are distributed as directories in Git repositories with a lockfile pinning an exact commit SHA, and the system is marked experimental in v1.8.0.