luan PR Description
Update an existing PR's title and description from branch context.
Assumes PR already exists. This skill NEVER pushes or submits.
Context
Log: !git log --oneline -10 2>/dev/null
Status: !git status -sb 2>/dev/null
Template: !cat .github/PULL_REQUEST_TEMPLATE.md 2>/dev/null
Step 1: Check State
Resolve at runtime:
- PR:
gh pr view --json number,title,body,headRefName -q '{number,title,headRefName}'. If empty, tell user and stop. - BASE:
gh stack view --json 2>/dev/null | jq -r '.trunk // empty' || gt parent 2>/dev/null || gt trunk 2>/dev/null || git symbolic-ref refs/remotes/origin/HEAD 2>/dev/null | sed 's|refs/remotes/||' || echo main
--auto → skip edge case questions, assume committed changes only. Without --auto:
Edge cases — ask before proceeding:
- On main: "You're on main. Did you mean to be on a feature branch?"
- Uncommitted changes: "Describe from just committed, or include uncommitted too?"
- No commits ahead: "Branch has no commits ahead. Describe uncommitted changes?"
If state is clear, proceed directly.
Step 2: Get Diff
git diff $BASE...HEAD # three-dot finds common ancestor
If including uncommitted (per Step 1): git diff HEAD
If diff is large, use --stat first and read key files.
Step 3: Generate Title and Body
Title: conventional commit per /commit skill — type(scope): description. Max 72 chars — GitHub truncates longer titles in list views.
Body: Follow the repo's PR template if one exists — fill each section from the diff. Otherwise, if recent merged PRs share a consistent format, match it. Fallback: 1-3 sentences explaining WHY with high-level HOW. Don't restate what's obvious from the diff.
Step 4: Preview and Update
Show title + body. Add observations only if genuinely useful:
- WHY is unclear → ask user for context
- Unrelated changes mixed in → suggest splitting
- Too large for one review → suggest multiple PRs
--auto → update directly. Without --auto → AskUserQuestion: "Update PR with this title and description?"
gh pr edit <NUMBER> --title "<title>" --body "<body>"
Show PR URL when done.