pr-review-merge

PR Review-to-Green + Smart Merge

Source-agnostic. Consumers pass: PR number, base branch, and bot-reviewer/CI rules from the project's ## Marathon Configuration (defaults if absent).

Ready Criteria (ALL must be true)

The PR is merge-ready only when all five are simultaneously true. Re-check from the top after every push — a fix can reopen an earlier criterion.

1. Branch in sync — no merge conflicts with base branch
2. CI passing — all checks succeed (or skipped)
3. All inline comments addressed — see thread resolution rules
4. No unaddressed conversation comments — actionable feedback responded to
5. All review threads resolved — no unresolved threads remain

Thread resolution rules: Follow bot reviewer rules from the project's CLAUDE.md Marathon Configuration. Generic defaults:

• Bot threads: Fix the code and push. Resolve via GraphQL if addressed. Use jq JSON builder (avoids zsh $ escaping):

  jq -n --arg tid "$THREAD_ID" '{"query": "mutation { resolveReviewThread(input: {threadId: \"\($tid)\"}) { thread { isResolved } } }"}' | gh api graphql --input -
  

• Human threads: Fix the code, reply inline explaining the fix, @mention the reviewer. Do NOT resolve human threads — let the reviewer confirm.

Shell Pitfalls

Never use gh ... --jq with complex filters. Always pipe to jq separately.

Use positive jq filters, not negative. zsh escapes != to \!=, breaking filters silently:

# WRONG: gh pr view --json reviews --jq '.reviews[] | select(.state != "APPROVED")'
# WRONG: gh pr view --json reviews | jq '.reviews[] | select(.state != "APPROVED")'
# RIGHT:
gh pr view --json reviews | jq '.reviews[] | select(.state == "CHANGES_REQUESTED")'

Review Loop (each iteration)

Step 1: Sync with base branch (FIRST, every iteration)

BASE=$(gh repo view --json defaultBranchRef --jq '.defaultBranchRef.name' 2>/dev/null || echo "main")
git fetch origin $BASE && git merge origin/$BASE --no-edit
# If conflicts: resolve them, commit, push
# If can't auto-resolve: report blocked with details

Resolving a .claude-plugin/plugin.json conflict (the common one in multi-PR waves). The conflict is not always confined to .version — a sibling PR may also have reframed the marketplace description or another field. A version-only line edit (sed-ing just the version line, or a regex that targets only .version) silently keeps the stale side of every other field and can leave merge markers behind. Resolve the whole file deterministically: take the side carrying the siblings' already-merged field changes (usually base), then overwrite only the version with jq:

git checkout --theirs .claude-plugin/plugin.json   # base side, which has the merged siblings' description/other-field edits
jq --arg v "<your-next-version>" '.version = $v' .claude-plugin/plugin.json > /tmp/pj && mv /tmp/pj .claude-plugin/plugin.json
git add .claude-plugin/plugin.json

Always git diff the full plugin.json before resolving — never assume the only divergence is the version line.

Conflict resolution patterns:

• Import/route files (e.g., App.tsx, index.ts): Accept BOTH sides — additions are additive
• Barrel exports (e.g., shared/index.ts): Accept both sides — each adds its own export
• Config/manifest files: Accept both sides unless the same key is modified differently (then ask)

Step 2: Check all criteria - delegate CI to background agent

PR=$(gh pr view --json number --jq '.number')

Spawn a background agent to watch CI (never block on CI yourself):

Agent(
  run_in_background: true,
  prompt: """
  Monitor PR #$PR for CI completion and review state.

  1. Block on CI: `gh pr checks $PR --watch --fail-fast`
  2. When CI settles, gather:
     - CI result: `gh pr checks $PR --json name,state,conclusion`
     - Unresolved threads: `gh api graphql ...` (all unresolved with path/line/author/body)
     - Conversation comments: `gh pr view $PR --comments --json comments`
     - Pending checks count
  3. Return structured report.
  """
)

While CI runs (you are FREE), do an immediate check for threads and comments:

# Quick thread check - fix what you can now
# Substitute the repo owner/name the consumer passed in.
gh api graphql -f query='query { repository(owner: "<owner>", name: "<repo>") {
  pullRequest(number: '$PR') { reviewThreads(first: 50) { nodes {
    id isResolved path line comments(first: 1) { nodes { author { login } body } }
  }}}}}' --jq '.data.repository.pullRequest.reviewThreads.nodes[]
  | select(.isResolved == false)
  | {id, author: .comments.nodes[0].author.login, path, line, body: .comments.nodes[0].body[0:200]}'

# For each unresolved thread with a path, check local code to see if already fixed.
# If addressed, resolve bot threads via GraphQL immediately (no push needed).

# Conversation comments
gh pr view $PR --comments

Step 3: Fix and batch

Fix issues locally while CI runs - stage changes but don't push yet:

• Unresolved bot threads - Check local code first at the referenced path:line. If already addressed, resolve via GraphQL immediately (no push needed). If not, fix the code and git add. Follow bot reviewer rules from CLAUDE.md Marathon Configuration.
• Unresolved human threads - Fix code, reply inline, @mention reviewer
• Actionable conversation comments - Respond or fix
• Merge conflicts - Resolve using patterns above, or report blocked if ambiguous

When background agent notification arrives (CI settled):

• CI passed + no local fixes staged: evaluate whether all 5 criteria are met
• CI passed + local fixes staged: push once (batches all thread fixes into one CI cycle)
• CI failed: fix CI issues too, then push everything together, spawn new background watcher
• ALL 5 criteria met - Report ready, STOP

This keeps you responsive. While CI runs, you process threads and comments. When CI settles, you act on the full report. No blocking waits.

Smart Merge

Invoked to merge a PR that has been reported merge-ready. Always verify via the API before merging — never trust the report.

Known: Stale bot CHANGES_REQUESTED. Some bot reviewers submit CR reviews that GitHub does not auto-dismiss on re-review. Check the project's Marathon Configuration for bot-specific patterns. Default: dismiss any stale bot CHANGES_REQUESTED before merging.

PR=<number>

# Step 1: Dismiss stale bot CRs
STALE_REVIEWS=$(gh api repos/<owner>/<repo>/pulls/$PR/reviews \
  --jq '[.[] | select(.state == "CHANGES_REQUESTED" and (.user.login | endswith("[bot]")))]')
echo "$STALE_REVIEWS" | jq -r '.[].id' | while read REVIEW_ID; do
  gh api repos/<owner>/<repo>/pulls/$PR/reviews/$REVIEW_ID/dismissals \
    --method PUT -f message="Stale bot review — verified findings addressed" -f event="DISMISS"
done

# Step 2: Check merge state
gh pr view $PR --json mergeStateStatus,mergedAt,reviews \
  | jq '{
    mergeStateStatus,
    mergedAt,
    approvals: [.reviews[] | select(.state == "APPROVED")] | length,
    changesRequested: [.reviews[] | select(.state == "CHANGES_REQUESTED")] | length
  }'

Auto-Merge Criteria (ALL must be true):

1. mergeStateStatus is "CLEAN" — OR "UNSTABLE" with only non-required checks failing
2. At least $REQUIRED_APPROVALS approvals — OR $MARKDOWN_APPROVALS for markdown-only PRs (some bot reviewers skip them)
3. Zero non-dismissed changes-requested reviews
4. Base branch is healthy — if the PR's CI failures exist on $BASE_BRANCH too (pre-existing), do NOT merge and compound the problem. Instead, spawn a separate worktree/PR to fix the failing tests on $BASE_BRANCH first, then rebase and merge the original PR.

UNSTABLE handling: If mergeStateStatus == "UNSTABLE", check failing checks against meta.flaky_checks and any CI patterns from the project's Marathon Configuration. If ALL failing checks are non-required AND not pre-existing on $BASE_BRANCH, treat as merge-eligible. Report: "Merging with UNSTABLE — only non-required checks failing: ". If failures ARE pre-existing on $BASE_BRANCH, fix it first (criterion 4).

UNKNOWN handling: GitHub sometimes returns mergeStateStatus: "UNKNOWN" even when all checks pass. If UNKNOWN but CI all green and 0 unresolved threads, retry up to 3 times with 30s backoff. If still UNKNOWN after retries, treat as CLEAN and proceed (log the override).

The merge command — use --admin on solo-maintainer repos. When $REQUIRED_APPROVALS is 0 and only the named required checks gate, a plain gh pr merge --squash can be refused ("base branch policy prohibits the merge") whenever a non-required check (CodeRabbit, an advisory AI review, a regression gate that re-runs on base advance) is PENDING or re-running at the exact merge instant — even though mergeStateStatus reported CLEAN/UNSTABLE a moment earlier. Once the named required checks are all SUCCESS, merge with admin override so a mid-run non-required check can't bounce you:

gh pr merge $PR --squash --delete-branch --admin

Only do this once the required checks are green (admin override bypasses branch policy, not your own merge criteria). On multi-PR waves, a gate that re-runs on every base advance (each merge re-triggers it on the pending PRs) makes the plain-merge bounce recurring — --admin avoids a wait-and-retry cycle per PR.

Verify before merging — never trust the caller's claim that a PR is ready:

gh pr view $PR --json state,mergedAt,mergeStateStatus | jq '{state, mergedAt, mergeStateStatus}'

Trust the API, not the message.

After merge — gate cleanup on a VERIFIED merge. A merge call can be rejected (see the --admin note above) while a chained one-liner blindly runs cleanup anyway, deleting the worktree and branch of a PR that never merged. Never chain cleanup unconditionally after the merge command. Confirm state == "MERGED" (or mergedAt != null) first, then close the unit via the consumer's close on merge adapter operation and remove its worktree + branch:

MERGED=$(gh pr view $PR --json state --jq '.state')
if [ "$MERGED" = "MERGED" ]; then
  git worktree remove --force <worktree-path-for-this-unit>
  git branch -D <branch-for-this-unit>
else
  echo "MERGE NOT CONFIRMED ($MERGED) — skipping cleanup, retry merge"
fi

Report the merge to the user. Any wave/next-task orchestration after a merge is the caller's responsibility (the marathon engine handles waves and teammate lifecycle) — this skill's job ends at a clean merge + cleanup.

If not merge-ready:

• BLOCKED → report blocked to the caller
• DIRTY (merge conflict) → resolve using the Review Loop conflict-resolution patterns, or report blocked if genuinely ambiguous
• Human changes requested → report to the caller; do not merge

Merge Order (multiple PRs)

1. Batch-dismiss stale CRs across ALL eligible PRs first:

   for PR in <all-eligible-pr-numbers>; do
     gh api repos/<owner>/<repo>/pulls/$PR/reviews \
       --jq '.[] | select(.state == "CHANGES_REQUESTED" and (.user.login | endswith("[bot]"))) | .id' \
     | while read REVIEW_ID; do
       gh api repos/<owner>/<repo>/pulls/$PR/reviews/$REVIEW_ID/dismissals \
         --method PUT -f message="Stale bot review — batch dismissed" -f event="DISMISS"
     done
   done
   

2. Sort by hot-file impact: Fewer hot files first. Hot-file PRs merge LAST.
3. Merge sequentially: One at a time. 10-20s between for conflict detection.
4. Re-check merge state after each — CLEAN can flip to DIRTY from cascade.