What problem does it solve? Keeping main capability specifications in sync with change proposals is tedious and error-prone when done by hand. This Skill applies the ADDED, MODIFIED, REMOVED, and RENAMED requirement blocks from a change's delta specs directly into the main specs, performing an intelligent merge instead of a blind overwrite. ## Core Features & Use Cases - Intelligent requirement merging: Adds new requirements, updates existing ones, removes deprecated ones, and applies renames while preserving content the delta does not mention. - Store-aware operation: Discovers registered OpenSpec stores and applies the correct --store flag so specs are synced in the right repository. - Safe capability retirement: Deletes a spec file only when strict conditions hold, including the retire_capabilities: true marker, and reports blockers otherwise. - Validation and summary: Runs openspec validate --specs after syncing and reports exactly which requirements were added, modified, removed, or renamed. - Use Case: After finishing a change that adds scenarios to the billing capability, ask the agent to sync the change's delta specs so the main billing spec reflects the new behavior without archiving the change. ## Quick Start Ask the agent to sync the delta specs from change "add-billing-invoices" into the main specs.