Powering the Agent Development Lifecycle with any framework, from ADK to LangChain and beyond

Agents CLI’s experimental Extension System, introduced in version 1.5.0 and expanded with a first-party LangChain extension in 1.8.0, allows teams to override built-in commands or add new ones without maintaining a fork of the CLI. It addresses framework lock-in by enabling LangChain, LangGraph, and Deep Agents projects to retain framework-agnostic lifecycle features such as Cloud Run deployment, infrastructure provisioning, observability, authentication, and evaluation tooling, while replacing only commands tied to ADK. Extensions are Git-distributed directories defined by an `agents-cli-extension.yaml` manifest, can be installed at project or user scope, and use lockfiles pinned to exact commit SHAs to provide reproducible local and CI behavior. The LangChain template scaffolds a FastAPI-based agent project with LangGraph support, overrides local execution, playground, selected evaluation, and publishing commands, and explicitly rejects unsupported ADK-dependent functions. The walkthrough also demonstrates an enterprise policy extension that intercepts deployment, generates and scans a software bill of materials for critical vulnerabilities, then delegates to the native deploy command without recursion, illustrating how organizations can encode governance requirements such as compliance checks into their development workflows.

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