stale-branches

Find branches in the current repository that are safe to delete because their PR is already merged. Scope is deliberately this repo only — never org-wide.

1. Get the user's merged PRs and their source branches (defaults to current repo): gh pr list --state merged --author @me --limit 100 --json number,title,headRefName,mergedAt
2. List branches that still exist:
   • local: git branch --format='%(refname:short)'
   • remote: git fetch --prune then git branch -r --format='%(refname:lstrip=3)'
3. A branch is stale if it still exists AND matches a merged PR's headRefName. Never treat these as stale — exclude them always: main, master, and anything under release/* or hotfix/*.
4. Present the stale branches as a numbered list: branch · PR #number · merged date, marking whether each exists locally, on the remote, or both.

Then stop and ask which to delete (all / some / none). Do not delete anything before the user confirms, even though prompts are off in this sandbox. Default to deleting nothing.

On confirmation, for each chosen branch:

• local: git branch -D <branch> (use -D: a squash- or rebase-merged branch is not recognised as merged by git branch -d, so -d would refuse exactly these. The merged-PR check in step 1 is the real safety gate — that's what confirms the work is preserved.)
• remote: git push origin --delete <branch>

Never delete a default or protected branch — branch-protection rules on the server are the real backstop; this skill is convenience, not authority.