APX Skills Bridge the Gap Between APC Protocol and Real-World Runtime Adoption

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APC is an open project contract standard that defines how repositories store agent rules, memory, and structure, but runtimes often ignore or reinvent these conventions without guidance. APX serves as the operational layer that installs APC-aware skills into compatible runtimes like Claude Code and Codex, teaching them to correctly read the .apc/ directory and respect the project contract. Without such skills, runtimes rediscover project context inconsistently on every session, leading to drift across tools and machines. APX keeps runtime state in a local directory outside the repository, ensuring the repo remains portable and clean. Together, APC defines what a project is while APX ensures runtimes know how to work with it consistently from day one.

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