PRD to OpenSpec

Decompose a PRD into OpenSpec change proposals, one per vertical slice. Each slice is a tracer bullet: a thin path through every layer, independently verifiable when done.

Confirm the OpenSpec surface

• openspec/ must exist; if not, the user initializes it (openspec init).
• Discover the installed CLI's verbs via openspec --help or the project's task runner before writing — don't assume command names.
• Change layout: openspec/changes/<change-id>/ holding proposal.md, design.md, tasks.md, and specs/ deltas per touched capability.

Slice the PRD

• Vertical, not horizontal: each slice cuts schema → API → UI → tests end-to-end. "All the endpoints" is a layer, not a slice.
• A finished slice is demoable or verifiable on its own.
• Prefactoring that makes later slices easy goes in its own first slice — make the change easy, then make the easy change.
• Use the existing OpenSpec glossary and decisions. Fall back to the project's CONTEXT/ADR convention only when it is the authoritative record.

Quiz the user