Estimate likely source changes before implementation.
Flow
- Read the PRD or spec.
- Extract scope, non-goals, acceptance criteria, and unknowns.
- Inspect likely touched repo areas.
- List likely files, including expected new files.
- Estimate additions and deletions per file.
- Use ranges and separate additions from deletions.
- Mark expected paths that do not exist as
new file. - Exclude generated, build, and lockfile output unless the PRD requires it.
- Recommend splitting when total changed lines likely exceed
400. - Use TEMPLATE.md for output.