/pr-description

name: pr-description
description: Generate a clear, reviewer-friendly pull-request description from a diff, covering what changed, why, risk, and how it was tested. Use when opening a pull request or writing/improving a PR body.
argument-hint: "(optional) base branch, ticket, or PR focus"

Write a pull-request description from the actual changes on this branch. Base it on the diff, not on what you assume was intended.

Gather context

• Diff the branch against its base (default to the repo's main branch, or the base the user named): review the changed files, the commits, and their messages.
• Identify the linked issue/ticket if one is referenced in the branch name, commits, or arguments.
• Separate the substantive change from incidental churn (formatting, renames, generated files).

Write the description

Use this structure, omitting any section that genuinely doesn't apply:

• **Summary**: one or two sentences on what this PR does.
• **What changed**: the concrete changes, grouped logically, referencing key files.
• **Why**: the motivation or problem being solved; link the issue.
• **Risk / impact**: blast radius, backward compatibility, breaking changes, data migrations, config/env or infra changes, anything reviewers should scrutinise.
• **Testing**: how it was verified, including tests added/updated, manual steps, and explicitly what was *not* covered.
• **Notes for reviewers**: trade-offs, follow-ups, screenshots for UI changes.

Rules

• Be factual and specific; describe what the diff does, and don't speculate or oversell.
• Call out breaking changes and required migration steps prominently.
• Keep it scannable: short paragraphs and bullets over walls of text.
• If the repo has a PR template (`.github/PULL_REQUEST_TEMPLATE*`), match its structure.
• Never fabricate test results; if something wasn't tested, say so.