What problem does it solve? When upstream documentation changes, it is hard to know which of your skills, agent instructions, or runbooks that cite it are now outdated. This Skill turns a source diff into a clear decision about each dependent instruction, avoiding both blind mass edits and missed updates. ## Core Features & Use Cases - Change Establishment: Tracks source identity (URL, revision, content hash, section) and checks version, platform, and mode alignment before drawing conclusions. - Dependency Tracing: Locates the exact claims, commands, or expectations in owner files that depend on the changed passage, keeping generated copies separate from canonical sources. - Decision Reporting: Classifies each affected claim as supported for update, still valid, or unresolved, with proposed minimal corrections and named validation checks. - Use Case: A Skill Watch check flags that an upstream CLI guide changed its checkpoint behavior. Use this Skill to review the diff, find the runbook instruction that contradicts it, and propose the smallest supported correction without inventing unverified test commands. ## Quick Start Review this supplied documentation diff against the skills and runbooks that cite it and tell me which instructions need updates, which remain valid, and which are unresolved.