LangChain uses Deep Agents CLI to make documentation code samples self-testing

LangChain addressed the universal documentation problem of stale code samples by transforming static inline code into testable, standalone examples. They utilized the Deep Agents CLI, which operates via reusable 'Skills'—step-by-step instructions—to automate the entire migration workflow, including moving code to dedicated files, adding setup/teardown, linting, marking snippets, running tests, and generating updated documentation, all without manual coding.