Write PR Description

Generate a structured PR description that explains why the change exists, not just what files were touched.

When to use

• The user provides a PR URL and asks to write or improve its description.
• The user asks to draft a PR description for the current branch.
• An agent needs to open a PR and wants a high-quality description.

Workflow

Phase 1: Gather context

Collect all the information needed to understand the change: