Skill Drift Is Contract Violation: Proactive Maintenance for LLM Agent Skill Libraries

arXiv:2605.10990v1 Announce Type: cross Abstract: LLM agents increasingly rely on reusable skill libraries, but these skills silently decay as the external services, packages, APIs, and configurations they reference evolve. Existing monitors detect such changes at the wrong granularity: they observe values, not the role those values play in a skill. A version string in a comment is noise; the same string in a pinned dependency is an operational obligation. We formulate skill drift as contract vi