What problem does it solve? Closing out a spec-driven development change requires merging delta specifications into the source-of-truth specs and moving the change folder into an audit archive, which is error-prone when done manually. ## Core Features & Use Cases - Delta Spec Sync: Merges ADDED, MODIFIED, REMOVED, and RENAMED requirements from delta specs into main specs while preserving untouched requirements. - Gated Archiving: Blocks archiving when review receipts are missing, tasks remain unchecked, or CRITICAL verification issues exist. - Multi-Mode Persistence: Supports engram, openspec, hybrid, and none artifact store modes with a mandatory archive report. - Use Case: After a feature change passes implementation and verification, the orchestrator delegates to this sub-agent to sync specs, move the change folder to openspec/changes/archive/YYYY-MM-DD-{change-name}/, and return a closure summary. ## Quick Start Ask the orchestrator to archive the completed SDD change by delegating to the sdd-archive sub-agent with the change name and artifact store mode.