Claude Code Skills

Claude Code Skills is an open source library of skills for Claude Code and Codex, maintained by independent product engineer Lev Berezhnoy. Each skill turns a recurring lesson from working with AI agents into reusable guidance that gives the agent a concrete outcome, a way of working and completion criteria, so work stays focused on the task result, the boundaries of the change and evidence that the solution actually works. The library suits developers who want consistent engineering discipline from coding agents across codebases and delivery stages without adopting an orchestrator or a single mandatory workflow. A user selects one skill per task. Skills cover work before development, such as examining the opportunity, requirements, architectural constraints and plan; implementation that stays within agreed scope, finds the root cause and checks the affected behaviour; review that separates confirmed facts from assumptions and states which checks passed, which were not run and what risks remain; and delivery and operations, keeping code readiness, publication and the observed state of the running system distinct. The repository ships Claude Code and Codex plugins, catalogue integrity checks and behavioural validation scenarios, and the project page includes a worked example of a bounded bug fix. The skills are free to inspect, adapt and use from the public GitHub repository. No paid tier is offered; the author separately takes on consulting and product engineering work. The project page is published in English, Spanish and Russian.