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Make the always-on / subscribed / project-rule distinction explicit at the authoring surface so it can't silently regress (for this operator or other users). Previously the tools said only 'cross-project rulebook rule' and a bare 'subscribe a project' — nothing steered project-specific detail away from shared rulebooks, which is how a Scribe-pinned rule ends up binding every family project. Principle encoded in 5 places: a rule's home is chosen by WHO it should bind, and both rulebook tiers are SHARED so their rules stay general — they differ in reach (all projects vs opt-in by theme), not generality. Project-specific detail goes in create_project_rule. - server.py MCP instructions: add the 3-tier authoring principle - create_rule / create_rulebook / create_project_rule / subscribe_* docstrings - using-scribe SKILL.md: a 'Where a new rule goes' note for the pull path Refs #755 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>