Ontology

This is a typed knowledge graph that lets Claude store and query structured information as entities and relations. You'd reach for it when you need to remember people, projects, tasks, or documents and how they connect, especially when multiple skills need to share state. Everything validates against a schema before committing, so you can enforce constraints like "tasks must have owners" or "no circular dependencies." The planning-as-graph-transformation pattern is clever: model multi-step work as a sequence of CREATE and RELATE operations that roll back if constraints break. Storage is append-only JSONL by default, which keeps things simple until you need SQLite. The cross-skill integration examples are the real payoff here.