Design Harvest

The on-ramp. Three modes.

Mode 1: harvest (/mddesign:harvest)

Goal: produce a structurally valid DESIGN.md at project root from the existing codebase.

Step 1: Pre-flight

• Glob for DESIGN.md at project root.
• If it exists and the user did NOT pass --overwrite, refuse: print "DESIGN.md already exists. Use /mddesign:critique instead, or pass --overwrite to replace."
• Confirm npx is available (bash -c "command -v npx").

Step 2: Dispatch the design-archeologist subagent

Call the Agent tool with subagent_type: design-archeologist and a prompt containing this PhaseSpec: