What problem does it solve? Keeping main specification files in sync with change proposals is tedious and error-prone when done by hand. This Skill applies delta specs (ADDED, MODIFIED, REMOVED, RENAMED requirements) from an OpenSpec change directly into the main specs with intelligent merging. ## Core Features & Use Cases - Delta Spec Application: Reads delta spec files from a change and applies requirement additions, modifications, removals, and renames to main specs under openspec/specs/. - Intelligent Merging: Applies partial updates such as adding a single scenario without copying entire requirements, preserving content not mentioned in the delta. - Interactive Change Selection: Lists available changes via openspec CLI and prompts the user to select one when no change name is provided. - Use Case: After finishing a feature change like add-auth, run the sync to merge its delta requirements into the main capability specs so the canonical documentation reflects the approved design. ## Quick Start Ask the AI to sync the delta specs from a specific change into the main specs, for example by saying: sync the specs from the add-auth change.