Google's Agents CLI, first launched at Cloud Next '26, now ships with an Extension System as of version 1.5.0. This allows developers to override existing commands or add new ones without forking the tool. Version 1.8.0 includes a first-party LangChain extension, enabling a full agent development lifecycle (scaffold, run, deploy, evaluate) with LangChain agents. It also facilitates custom policies, like an SBOM scan wrapping the deploy command.
This is a welcome evolution for agent development, especially for teams working across multiple frameworks or needing to enforce enterprise-specific governance. If you've been avoiding Agents CLI due to its initial ADK opinionation, this update makes it far more versatile. The limitation is that while the system is flexible, building complex custom extensions for unique policies will still require internal development effort.
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