What problem does it solve? Editing a large or heavily-reviewed design doc, RFC, or spec single-threaded is slow and risks breaking headings, anchors, intra-doc links, and pinned review comments. This Skill fans out one read-only agent per section, collects verbatim old_string to new_string edits with rationale and risk tiers, and applies them under a whole-doc structural guard. ## Core Features & Use Cases - Parallel section editing: Partitions the doc on heading boundaries and dispatches up to 20 concurrent read-only section agents, each returning exact string replacements with a one-line rationale and risk tier. - Whole-doc integrity guard: The coordinator verifies every old_string is unique across the entire file, keeps headings, tables, code blocks, and anchors byte-identical, and downgrades cuts that hit link targets, table mirrors, or review-anchored passages. - Risk-tiered cut policy: Clean redundancies auto-apply after cross-ref checks, framing-only edits are flagged for the author, and anything touching rationale is discarded. - Use Case: Before shipping a 40-section RFC that is already under GitHub review, run a full pass so every section gets tightened in parallel while the verifier confirms all links, anchors, and reviewer-pinned passages still resolve. ## Quick Start Ask the assistant to do a full pass over your large design doc or RFC, reviewing every section and tightening it while preserving structure and anchors.