llmlb: Skill for Gemini CLI

GH PR Check

Overview

Check PR status for the current branch with gh and report a recommended next action.

This skill is check-only:

• Do not create/switch branches
• Do not push
• Do not create/edit PRs

Decision rules (must follow)

1. Resolve repository, head branch, and base branch.
   • head: current branch (git rev-parse --abbrev-ref HEAD)
   • base: default develop unless user specifies
2. Optionally collect local working tree state:
   • git status --porcelain
   • Report as context only; do not mutate files.
3. Fetch latest remote refs before comparing:
   • git fetch origin
4. List PRs for head branch:
   • gh pr list --head <head> --state all --json
   • number,state,mergedAt,updatedAt,url,title,mergeCommit,baseRefName,headRefName
5. Classify:
   • No PR found -> NO_PR + recommended action CREATE_PR
   • Any PR where mergedAt == null -> UNMERGED_PR_EXISTS + recommended action PUSH_ONLY
   • All PRs merged -> perform post-merge commit check
6. Post-merge commit check (critical when all PRs are merged):
   • Select latest merged PR by mergedAt
   • Get merge commit SHA from mergeCommit.oid
   • Verify merge commit ancestry before counting:
     • git merge-base --is-ancestor <merge_commit> HEAD
   • If merge commit is ancestor of HEAD, count commits after merge:
     • git rev-list --count <merge_commit>..HEAD
   • If count > 0 -> ALL_MERGED_WITH_NEW_COMMITS + CREATE_PR
   • If count == 0 -> ALL_MERGED_NO_NEW_COMMITS + NO_ACTION
7. Fallback when merge commit SHA is missing or not an ancestor of HEAD:
   • First compare against branch upstream (preferred):
     • git rev-list --count origin/<head>..HEAD
   • Count > 0 -> ALL_MERGED_WITH_NEW_COMMITS + CREATE_PR (fallback)
   • Count == 0 -> ALL_MERGED_NO_NEW_COMMITS + NO_ACTION (fallback)
   • If upstream comparison fails, compare against base:
     • git rev-list --count origin/<base>..HEAD
   • If base comparison fails -> CHECK_FAILED + MANUAL_CHECK