| name | gwt-pr-check |
| description | Check GitHub PR status with the gh CLI, including unmerged PR detection and post-merge new-commit detection for the current branch. |
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)
- Resolve repository,
head branch, and base branch.
head: current branch (git rev-parse --abbrev-ref HEAD)base: default develop unless user specifies
- Optionally collect local working tree state:
git status --porcelain- Report as context only; do not mutate files.
- Fetch latest remote refs before comparing:
- List PRs for head branch:
gh pr list --head <head> --state all --jsonnumber,state,mergedAt,updatedAt,url,title,mergeCommit,baseRefName,headRefName
- 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
- 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
- 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
Output contract
Return a human-readable summary by default.
Do not return raw JSON as the default output.
If JSON is explicitly requested by the user, append it after the human summary.
Recommended status values:
NO_PRUNMERGED_PR_EXISTSALL_MERGED_WITH_NEW_COMMITSALL_MERGED_NO_NEW_COMMITSCHECK_FAILED
Recommended action values:
CREATE_PRPUSH_ONLYNO_ACTIONMANUAL_CHECK
Language rule
- Follow the user's input language for all headings and messages.
- If the language is ambiguous, use English.
Default output template
Output 1-3 lines using a signal prefix + action keyword on line 1.
| Prefix | Action | Meaning |
|---|
>> | CREATE PR | Create a new PR |
> | PUSH ONLY | Push to existing PR |
-- | NO ACTION | Nothing to do |
!! | MANUAL CHECK | Manual check required |
Per-status format:
-
NO_PR:
>> CREATE PR — No PR exists for <head> -> <base>.
-
UNMERGED_PR_EXISTS (2 lines):
> PUSH ONLY — Unmerged PR open for `<head>`.
PR: #<number> <url>
-
ALL_MERGED_WITH_NEW_COMMITS (2 lines):
>> CREATE PR — <N> new commit(s) after last merge (#<pr_number>).
head: <head> -> base: <base>
-
ALL_MERGED_NO_NEW_COMMITS:
-- NO ACTION — All PRs merged, no new commits on <head>.
-
CHECK_FAILED (2 lines):
!! MANUAL CHECK — Could not determine PR status.
Reason: <reason>
head: <head> -> base: <base>
Append the following line only when the worktree is dirty:
(!) Worktree has uncommitted changes.
Status-to-action mapping (must use)
| Status | Prefix | Action | Template |
|---|
NO_PR | >> | CREATE PR | No PR exists |
UNMERGED_PR_EXISTS | > | PUSH ONLY | Unmerged PR open |
ALL_MERGED_WITH_NEW_COMMITS | >> | CREATE PR | N new commit(s) |
ALL_MERGED_NO_NEW_COMMITS | -- | NO ACTION | All PRs merged |
CHECK_FAILED | !! | MANUAL CHECK | Could not determine |
Example outputs
NO_PR:
>> CREATE PR — No PR exists for `feature/my-branch` -> `develop`.
UNMERGED_PR_EXISTS:
> PUSH ONLY — Unmerged PR open for `feature/my-branch`.
PR: #456 https://github.com/org/repo/pull/456
ALL_MERGED_WITH_NEW_COMMITS:
>> CREATE PR — 3 new commit(s) after last merge (#123).
head: feature/my-branch -> base: develop
ALL_MERGED_NO_NEW_COMMITS:
-- NO ACTION — All PRs merged, no new commits on `feature/my-branch`.
CHECK_FAILED:
!! MANUAL CHECK — Could not determine PR status.
Reason: Could not resolve merge commit and fallback comparison failed
head: feature/my-branch -> base: develop
With dirty worktree (appended to any status):
>> CREATE PR — 3 new commit(s) after last merge (#123).
head: feature/my-branch -> base: develop
(!) Worktree has uncommitted changes.
Workflow (recommended)
- Verify repo context:
git rev-parse --show-toplevelgit rev-parse --abbrev-ref HEAD
- Confirm auth:
- Collect context:
git status --porcelaingit fetch origin
- List PRs for head branch and classify using rules above.
- When all PRs are merged, validate merge commit ancestry before counting commits.
- If merge commit is not usable, fallback to
origin/<head>..HEAD first.
- Print human-readable result using the default template.
- Append JSON only if the user explicitly asks for machine-readable output.
Quick start
python3 ".gemini/skills/gwt-pr-check/scripts/check_pr_status.py" --repo "."
python3 ".gemini/skills/gwt-pr-check/scripts/check_pr_status.py" --repo "." --base develop
python3 ".gemini/skills/gwt-pr-check/scripts/check_pr_status.py" --repo "." --json
Command snippet (bash)
head="${HEAD_BRANCH:-$(git rev-parse --abbrev-ref HEAD)}"
base="${BASE_BRANCH:-develop}"
dirty=0
if [ -n "$(git status --porcelain)" ]; then
dirty=1
fi
git fetch origin
pr_json="$(gh pr list --head "$head" --state all --json number,state,mergedAt,updatedAt,url,title,mergeCommit)"
pr_count="$(echo "$pr_json" | jq 'length')"
unmerged_count="$(echo "$pr_json" | jq 'map(select(.mergedAt == null)) | length')"
if [ "$pr_count" -eq 0 ]; then
status="NO_PR"
action="CREATE_PR"
reason="No PR found for head branch"
elif [ "$unmerged_count" -gt 0 ]; then
status="UNMERGED_PR_EXISTS"
action="PUSH_ONLY"
reason="At least one PR for the head branch is not merged"
else
merge_commit="$(echo "$pr_json" | jq -r 'sort_by(.mergedAt) | last | .mergeCommit.oid')"
merge_commit_ancestor=0
if [ -n "$merge_commit" ] && [ "$merge_commit" != "null" ] && \
git merge-base --is-ancestor "$merge_commit" HEAD 2>/dev/null; then
merge_commit_ancestor=1
new_commits="$(
git rev-list --count "$merge_commit"..HEAD 2>/dev/null || echo ""
)"
else
new_commits=""
fi
if [ -n "$new_commits" ]; then
if [ "$new_commits" -gt 0 ]; then
status="ALL_MERGED_WITH_NEW_COMMITS"
action="CREATE_PR"
reason="$new_commits commits found after last merge"
else
status="ALL_MERGED_NO_NEW_COMMITS"
action="NO_ACTION"
reason="No commits found after last merge"
fi
else
upstream_commits="$(
git rev-list --count "origin/$head"..HEAD 2>/dev/null || echo ""
)"
if [ -n "$upstream_commits" ]; then
if [ "$upstream_commits" -gt 0 ]; then
status="ALL_MERGED_WITH_NEW_COMMITS"
action="CREATE_PR"
reason="Fallback check found commits ahead of origin/$head"
else
status="ALL_MERGED_NO_NEW_COMMITS"
action="NO_ACTION"
reason="Fallback check found no commits ahead of origin/$head"
fi
else
fallback_commits="$(
git rev-list --count "origin/$base"..HEAD 2>/dev/null || echo ""
)"
if [ -n "$fallback_commits" ]; then
if [ "$fallback_commits" -gt 0 ]; then
status="ALL_MERGED_WITH_NEW_COMMITS"
action="CREATE_PR"
reason="Fallback check found commits ahead of origin/$base"
else
status="ALL_MERGED_NO_NEW_COMMITS"
action="NO_ACTION"
reason="Fallback check found no commits ahead of origin/$base"
fi
else
status="CHECK_FAILED"
action="MANUAL_CHECK"
reason="Could not resolve merge commit and fallback comparison failed"
fi
fi
fi
fi
latest_merged_pr="$(
echo "$pr_json" \
| jq -r 'sort_by(.mergedAt) | last | .number // empty'
)"
unmerged_pr="$(
echo "$pr_json" \
| jq -r 'map(select(.mergedAt == null)) | first | .number // empty'
)"
unmerged_pr_url="$(
echo "$pr_json" \
| jq -r 'map(select(.mergedAt == null)) | first | .url // empty'
)"
case "$status" in
NO_PR)
echo ">> CREATE PR — No PR exists for \`$head\` -> \`$base\`."
;;
UNMERGED_PR_EXISTS)
echo "> PUSH ONLY — Unmerged PR open for \`$head\`."
echo " PR: #$unmerged_pr $unmerged_pr_url"
;;
ALL_MERGED_WITH_NEW_COMMITS)
n="${new_commits:-$upstream_commits}"
echo ">> CREATE PR — $n new commit(s) after last merge (#$latest_merged_pr)."
echo " head: $head -> base: $base"
;;
ALL_MERGED_NO_NEW_COMMITS)
echo "-- NO ACTION — All PRs merged, no new commits on \`$head\`."
;;
*)
echo "!! MANUAL CHECK — Could not determine PR status."
echo " Reason: $reason"
echo " head: $head -> base: $base"
;;
esac
if [ "$dirty" -eq 1 ]; then
echo " (!) Worktree has uncommitted changes."
fi
Related skill
gwt-pr: creates/updates PRsgwt-pr-fix: diagnoses and fixes failing PRs
