PR Comment

This skill writes PR descriptions and change summaries for reviewers. It does not handle inline review replies or generic issue comments.

Output rules

• Output only one fenced markdown block.
• Use ## Summary and ## Key Changes.
• Include issue-closing text like Closes #43 when appropriate and known.
• Do not add prose before or after the fenced block.
• Keep the write-up concise and copy-paste ready.

Apply this skill when

• the user says "write a PR", "draft a PR", "summarize this PR", or "describe this diff"
• the user wants a reviewer-facing change summary
• the user shares a diff or changed files and wants a polished PR body

Goals

1. Tell the reviewer what changed in user-visible terms.
2. Explain why the diff exists, especially the root cause.
3. Group the key changes without dumping a file-by-file changelog.
4. Include issue-closing language when there is a linked issue.

Format

## Summary

<one short paragraph, usually 2-4 sentences>

## Key Changes

<1-3 bullets for a small change, or grouped bullets by area for a larger one>

Closes #<issue>

## Summary

The summary should cover:

• what changed
• where it changed
• why it changed

Lead with the user-visible surface or workflow. Include the root cause when it helps the reviewer understand why the diff exists.

## Key Changes

• Small change: use 1-3 bullets total.
• Multi-area change: group bullets by area with a plain label line such as Registry: or Docs:.
• Name specific symbols, files, commands, or surfaces only when that increases reviewer understanding.
• Do not restate the summary or enumerate every touched file.

Style rules

• Backticks for file paths, commands, symbols, and config keys.
• Prefer direct reviewer-facing language.
• Keep the body tight; cut preamble like "This PR" or "In this change".
• Use root-cause framing when it clarifies a bug fix.
• Ground claims in the visible diff or in user-provided context.

Issue-closing rules

• If the linked issue is known and the change resolves it, include a closing line such as Closes #43.
• If issue linkage is ambiguous, leave it out unless the user asked for it.
• Put the closing line at the end of the markdown block.

Ask only if needed

If the user gave a diff but not enough context, ask at most once for:

• the main user-visible surface affected
• whether an issue number should be closed

If the user already explained the change well enough, write immediately.