Behavioral PRD Writing

Co-author a behavioral PRD for a repository through structured interview and codebase exploration. Output is docs/prd.md at the repo root.

The goal is a document that captures what the system should do — from the outside, in plain language — without prescribing how to build it. Downstream skills and processes generate stories, epics, and feature specs from this PRD.

Scope Model

PRD (per-repo) → Capability Groups (independently shippable) → Behaviors (testable statements)

Workflow

Step 1: Explore the codebase

Before interviewing, explore the repo. Understand what exists — code structure, existing docs, patterns, naming conventions. This grounds the interview in reality and prevents asking questions the codebase already answers.