What problem does it solve? When a milestone hits a question the current session cannot settle—statistical correctness, high-stakes design decisions—this Skill provides a governed escalation path: it drafts a self-contained Review Brief (RB), gates spawning a stronger Fable model behind explicit user approval, and ingests the resulting Review Report (RR) back into project tracking files. ## Core Features & Use Cases - Review Brief creation: Generates a fully self-contained RB file in cairn/reviews/ with background, exact files/lines, numbered questions, and constraints, assuming zero conversation context. - Approval-gated Fable escalation: Presents scope and token-cost estimates through an approval gate before spawning a Fable subagent, or emits a copyable prompt for manual handoff. - RR ingestion: Records review answers as dated decision entries, promotes cross-cutting findings to cairn/DECISIONS.md, ingests binding criteria verbatim into milestone acceptance criteria, and archives the RB/RR pair. - Use Case: A milestone is blocked on whether a statistical method is correct. Run the skill to draft RB07, get user approval, spawn a Fable review, then ingest RR07 so its binding criteria become numbered acceptance criteria on the milestone. ## Quick Start Ask the agent to escalate the current blocking question by running /milestone-brief with the milestone id and topic, for example to request a Fable review of a statistical design decision.