Validation

Reverse lookup: given an entity id, return anti-pattern violations whose `target_entities` include the entity's type. Use after `validate_graph` to drill into one entity's implicated patterns. Matches by entity type today; tightens to specific ids in a future revision. Underpins the Inspect approach.

Audit one or every UPG skill for source-vs-deployed integrity. Use before recommending a skill to confirm `.claude/skills/<name>/SKILL.md` is a symlink to canonical source and the bodies match. When `in_sync: false`, what you read from `packages/upg-mcp-server/skills/` is NOT what the user will experience.

Walk the loaded graph and return a per-class, per-node report of schema drift plus anti-pattern violations from `UPG_ANTI_PATTERNS`. Schema-drift classes: non-canonical entity types, non-canonical edge types, top-level fields outside `UPGBaseNode`, invalid status values, self-referential `source_id`/`source_type`, properties matching `UPG_PROPERTY_MIGRATIONS` rules. Anti-patterns: catalog entries that fired against the live graph, sorted high → medium → low. Each entry carries `suggested_migration` (drift) or `remediation` (anti-pattern). Top-level `valid` is true iff drift is empty AND no violations fired. Read-only; pairs with `migrate_type`, `rename_edge_type`, `get_anti_pattern_violations_for`.