Pr Triage

PR Triage

4-phase workflow for maintainers: automated audit of all open PRs, opt-in deep review via parallel agents, validated comment posting, and optional worktree setup for local review.

When to Use This Skill

| Skill | Usage | Output | |-------|-------|--------| | /pr-triage | Sort, review, and comment on a PR backlog | Triage table + reviews + posted comments | | /review-pr | Review a single PR in depth | Inline PR review |

Triggers:

• Manually: /pr-triage or /pr-triage all or /pr-triage 42 57
• Proactively: when >5 PRs open without review, or stale PR >14 days detected

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Language

• Check the argument passed to the skill
• If en or english → tables and summary in English
• If fr, french, or no argument → French (default)
• Note: GitHub comments (Phase 3) are ALWAYS in English (international audience)

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Configuration

Thresholds used throughout the workflow. Edit to match your project:

| Parameter | Default | Description | |-----------|---------|-------------| | staleness_days | 14 | Days without activity before flagging as stale | | overlap_threshold | 50% | Shared files % to flag as overlapping | | cluster_min_prs | 3 | Author PR count to trigger cluster suggestion | | xl_cutoff_additions | 1000 | Additions above which a PR is classified XL | | xl_cutoff_files | 10 | Changed files above which a PR is "too large" |

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Preconditions

git rev-parse --is-inside-work-tree
gh auth status

If either fails, stop and explain what is missing.

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Phase 1: Audit (always executed)

Data Gathering (parallel commands)

gh repo view --json nameWithOwner -q .nameWithOwner
gh pr list --state open --limit 50 \
  --json number,title,author,createdAt,updatedAt,additions,deletions,changedFiles,isDraft,mergeable,reviewDecision,statusCheckRollup,body
gh api "repos/{owner}/{repo}/collaborators" --jq '.[].login'

Collaborators fallback: if gh api .../collaborators returns 403/404:

gh pr list --state merged --limit 10 --json author --jq '.[].author.login' | sort -u

If still ambiguous, ask via AskUserQuestion.

For each PR, fetch reviews and changed files:

gh api "repos/{owner}/{repo}/pulls/{num}/reviews" \
  --jq '[.[] | .user.login + ":" + .state] | join(", ")'
gh pr view {num} --json files --jq '[.files[].path] | join(",")'

Notes: Fetching files requires 1 API call per PR; for 20+ PRs, prioritize overlap candidates. The author field is an object; always extract .author.login.

Analysis

Size classification: | Label | Additions | |-------|-----------| | XS | 1000 |

Size format: +{additions}/-{deletions}, {files} files ({label})

Detections:

• Overlaps: compare file lists across PRs; if >50% files in common → cross-reference
• Clusters: author with 3+ open PRs → suggest review order (smallest first)
• Staleness: no activity for >14 days → flag "stale"
• CI status: via statusCheckRollup → clean / unstable / dirty
• Reviews: approved / changes_requested / none

PR ↔ Issue linking:

• Scan each PR body for fixes #N, closes #N, resolves #N (case-insensitive)
• If found, display in the table: Fixes #42 in the Action/Status column

Categorization:

Internal PRs: author in collaborators list

External, Ready: additions ≤ 1000 AND files ≤ 10 AND mergeable ≠ CONFLICTING AND CI clean/unstable

External, Problematic: any of:

• additions > 1000 OR files > 10
• OR mergeable == CONFLICTING (merge conflict)
• OR CI dirty (statusCheckRollup contains failures)
• OR overlap with another open PR (>50% shared files)

Output: Triage Table

## Open PRs ({count})

### Internal PRs
| PR | Title | Size | CI | Status |
| -- | ----- | ---- | -- | ------ |

### External: Ready for Review
| PR | Author | Title | Size | CI | Reviews | Action |
| -- | ------ | ----- | ---- | -- | ------- | ------ |

### External: Problematic
| PR | Author | Title | Size | Problem | Recommended Action |
| -- | ------ | ----- | ---- | ------- | ------------------ |

### Summary
- Quick wins: {XS/S PRs ready to merge}
- Risks: {overlaps, XL sizes, CI dirty}
- Clusters: {authors with 3+ PRs}
- Stale: {PRs with no activity >14d}
- Overlaps: {PRs touching the same files}

0 PRs → display No open PRs. and stop.

Navigation Post-Phase 1

After displaying the triage table, ask via AskUserQuestion:

question: "What would you like to do next?"
header: "Next Step"
options:
  - label: "Phase 2: Deep review"
    description: "Analyze selected PRs with code-reviewer agents and generate comment drafts"
  - label: "Phase 4: Create worktrees"
    description: "Set up local worktrees for hands-on review (skips comment generation)"
  - label: "Done"
    description: "End the workflow here"

Note: Phase 3 (posting comments) is NOT offered here, as it requires the drafts generated in Phase 2. If the user picks "Phase 4", Phase 2 → Phase 3 remains accessible afterward.

Automatic Copy

After displaying the triage table, copy to clipboard using platform-appropriate command:

UNAME=$(uname -s)
if [ "$UNAME" = "Darwin" ]; then
  pbcopy /dev/null; then
  echo "{full triage table}" | xclip -selection clipboard
elif command -v wl-copy &>/dev/null; then
  echo "{full triage table}" | wl-copy
elif command -v clip.exe &>/dev/null; then
  echo "{full triage table}" | clip.exe
fi

Confirm: Triage table copied to clipboard. (EN) / Tableau copié dans le presse-papier. (FR)

---

Phase 2: Deep Review (opt-in)

PR Selection

If argument passed:

• "all" → all external PRs
• Numbers ("42 57") → only those PRs
• No argument → propose via AskUserQuestion

If no argument, display:

question: "Which PRs do you want to review in depth?"
header: "Deep Review"
multiSelect: true
options:
  - label: "All external"
    description: "Review {N} external PRs with parallel code-reviewer agents"
  - label: "Problematic only"
    description: "Focus on {M} risky PRs (CI dirty, too large, overlaps)"
  - label: "Ready only"
    description: "Review {K} PRs ready to merge"
  - label: "Skip"
    description: "Stop here, audit only"

Draft PR behavior:

• Draft PRs are EXCLUDED from "All external" and "Ready only"
• Draft PRs are INCLUDED in "Problematic only" (they need attention)
• To review a draft: type its number explicitly (e.g. 42)

If "Skip" → end workflow.

Executing Reviews

For each selected PR, launch a code-reviewer agent via Task tool in parallel:

subagent_type: code-reviewer
model: sonnet
prompt: |
  Review PR #{num}: "{title}" by @{author}

  **Metadata**: +{additions}/-{deletions}, {changedFiles} files ({size_label})
  **CI**: {ci_status} | **Reviews**: {existing_reviews} | **Draft**: {isDraft}

  **PR Body**:
  {body}

  **Diff**:
  {gh pr diff {num} output}

  Apply your security and architecture expertise. Use the project-specific checklist
  from the SKILL.md Configuration section if available.

  Return structured review:
  ### Critical Issues
  ### Important Issues
  ### Suggestions
  ### What's Good

  Be specific: quote file:line, explain the issue, suggest the fix.

Fallback if parallel agents unavailable: run reviews sequentially, one PR at a time. Notify user: Running sequential review (parallel agents not available).

Fetch diff via:

gh pr diff {num}
gh pr view {num} --json body,title,author -q '{body: .body, title: .title, author: .author.login}'

Aggregate all reports. Display a summary after all reviews complete.

---

Phase 3: Comments (mandatory validation)

Draft Generation

For each reviewed PR, generate a GitHub comment using the template templates/review-comment.md.

Rules:

• Language: English (international audience)
• Tone: professional, constructive, factual
• Always include at least 1 positive point
• Quote code lines when relevant (format file:42)

Display and Validation

Display ALL drafted comments in format:

---
### Draft: PR #{num}: {title}

{full comment}

---

Then request validation via AskUserQuestion:

question: "These comments are ready. Which ones do you want to post?"
header: "Post Comments"
multiSelect: true
options:
  - label: "All ({N} comments)"
    description: "Post on all reviewed PRs"
  - label: "PR #{x}: {title_truncated}"
    description: "Post only on this PR"
  - label: "None"
    description: "Cancel, post nothing"

(Generate one option per PR + "All" + "None")

Posting

For each validated comment:

gh pr comment {num} --body-file - ` with `.context()` for error chain (no `.unwrap()` in production code)
- No `clone()` on hot paths without justification
- `lazy_static!` or `once_cell` for static regex
- Lifetime annotations where ownership is non-obvious

**Go**:
- Explicit error handling (no `_` discard without comment)
- `defer` for resource cleanup
- Context propagation in concurrent code
- No goroutine leaks

**Generic** (stack-agnostic):
- No secrets or hardcoded credentials
- New public functions have tests
- Breaking changes documented in PR body
- Dependencies added have clear justification

---

---

## Phase 4: Worktree Setup (opt-in)

Creates local git worktrees for each selected PR so you can run, test, or review code without switching branches.

**Never triggered automatically.** Only via Phase 1 navigation or explicit user request.

### Step 4.1: Cache check + PR list

**Cache check**: before using data from Phase 1, verify it is less than 30 minutes old:

```bash
CACHE_FILE="/tmp/pr-triage-prs.json"
CACHE_AGE=$(( $(date +%s) - $(stat -f %m "$CACHE_FILE" 2>/dev/null || echo 0) ))
if [ "$CACHE_AGE" -gt 1800 ]; then
  echo "STALE_CACHE"
fi

If STALE_CACHE → re-run the Phase 1 data gathering before continuing.

Filter: exclude Draft PRs and bot PRs (Dependabot, renovate, etc.):

python3 -c "
import json
prs = json.load(open('/tmp/pr-triage-prs.json'))
filtered = [
  p for p in prs
  if not p['isDraft']
  and not any(bot in p['author']['login'].lower() for bot in ['dependabot', 'renovate', 'snyk'])
]
import sys; json.dump(filtered, sys.stdout, indent=2)
" > /tmp/pr-triage-phase4.json

If 0 PRs after filtering → display No reviewable PRs available for worktree (all are drafts or bots). + end Phase 4.

Display grouped by author (use display name if available, fallback to login):

## PRs available for worktree (non-draft)

### Alice Martin (@alice)
  [1] #123: feat(auth): add OAuth2 support
      Branch: feat/oauth2  |  Size: M  |  CI: clean

### Bob Chen (@bob)
  [2] #456: fix(api): handle empty response
      Branch: fix/empty-response  |  Size: S  |  CI: dirty ⚠️

Step 4.2: Selection

Ask via AskUserQuestion (multiSelect):

question: "Which PRs do you want to create a worktree for?"
header: "Worktree Setup"
multiSelect: true
options:
  - label: "All"
    description: "Create worktrees for all {N} listed PRs"
  - label: "[1] #{num}: {title} ({author})"
    description: "Branch: {branch} | Size: {size} | CI: {ci}"
  - label: "None"
    description: "Cancel, return to menu"

If "None" → end Phase 4.

Step 4.3: Sequential creation

Execution model: Claude runs one bash command per PR, reads its output, updates its internal state (created / existing / failed), then moves to the next. Never a bash loop wrapping all PRs.

For each selected PR, Claude sets variables explicitly then runs:

PR_NUM="123"
BRANCH_NAME="feat/oauth2"
WORKTREE_NAME="${BRANCH_NAME//\//-}"
REPO_ROOT="$(cd "$(git rev-parse --git-common-dir)/.." && pwd)"
WORKTREE_DIR="$REPO_ROOT/.worktrees/$WORKTREE_NAME"

# Already exists?
if [ -d "$WORKTREE_DIR" ]; then
  echo "STATUS:EXISTING:$PR_NUM:$WORKTREE_DIR"
  exit 0
fi

# .gitignore check (fail-fast)
if ! grep -qE "^\.worktrees/?$" "$REPO_ROOT/.gitignore" 2>/dev/null; then
  echo "STATUS:GITIGNORE_MISSING:$PR_NUM"
  exit 1
fi

# Fetch remote branch
if ! git fetch origin "$BRANCH_NAME" 2>/tmp/wt-fetch-$PR_NUM.log; then
  echo "STATUS:FETCH_FAILED:$PR_NUM"
  exit 1
fi

mkdir -p "$REPO_ROOT/.worktrees"

# Create worktree (branch local exists or not)
if ! git branch --list "$BRANCH_NAME" | grep -q "$BRANCH_NAME"; then
  git worktree add -b "$BRANCH_NAME" "$WORKTREE_DIR" "origin/$BRANCH_NAME" \
    2>/tmp/wt-err-$PR_NUM.log
else
  git worktree add "$WORKTREE_DIR" "$BRANCH_NAME" \
    2>/tmp/wt-err-$PR_NUM.log
fi

if [ $? -ne 0 ]; then
  if grep -q "already checked out" /tmp/wt-err-$PR_NUM.log; then
    echo "STATUS:ALREADY_CHECKED_OUT:$PR_NUM"
  else
    echo "STATUS:CREATE_FAILED:$PR_NUM"
  fi
  exit 1
fi

# Optional: symlink node_modules (Node.js projects, avoids reinstall)
[ -d "$REPO_ROOT/node_modules" ] && ln -sf "$REPO_ROOT/node_modules" "$WORKTREE_DIR/node_modules"

# Copy project-specific files listed in .worktreeinclude (if present)
if [ -f "$REPO_ROOT/.worktreeinclude" ]; then
  while IFS= read -r entry || [ -n "$entry" ]; do
    [[ "$entry" =~ ^#.*$ || -z "$entry" ]] && continue
    entry="$(echo "$entry" | xargs)"
    [ -e "$REPO_ROOT/$entry" ] && {
      mkdir -p "$(dirname "$WORKTREE_DIR/$entry")"
      cp -R "$REPO_ROOT/$entry" "$WORKTREE_DIR/$entry"
    }
  done > .gitignore
Then re-run Phase 4.

Step 4.4: Update existing worktrees

If any STATUS:EXISTING collected, offer a single prompt:

Existing worktrees detected:
  PR #123: .worktrees/feat-oauth2
  PR #789: .worktrees/fix-session-leak

- [Pull all] git pull --ff-only in all existing worktrees
- [#123] Pull PR #123 only
- [Skip] Leave as-is

For each selected pull, Claude runs (one command per worktree):

PR_NUM="123"
BRANCH_NAME="feat/oauth2"
WORKTREE_DIR="/abs/path/.worktrees/feat-oauth2"

cd "$WORKTREE_DIR" && git pull origin "$BRANCH_NAME" --ff-only 2>/tmp/wt-pull-$PR_NUM.log
echo "PULL_STATUS:$?:$PR_NUM"

If PULL_STATUS ≠ 0:

⚠️ PR #123: --ff-only failed (branches have diverged)
   Manual fix: cd .worktrees/feat-oauth2 && git pull --rebase

Step 4.5: Summary

## Worktrees ready

| PR | Author | Branch | Path | Status |
|----|--------|--------|------|--------|
| #123 | Alice | feat/oauth2 | .worktrees/feat-oauth2 | Created |
| #456 | Bob | fix/empty-response | .worktrees/fix-empty-response | Created |
| #789 | Alice | fix/session-leak | .worktrees/fix-session-leak | Updated (pull) |
| #321 | Carol | feat/chat | .worktrees/feat-chat | Fetch failed ⚠️ |

Note: if a PR modifies package.json, install dependencies manually:
  cd .worktrees/ && npm install   # or pnpm/yarn/bun

Next steps:
  cd .worktrees/
  claude

.worktreeinclude convention

Create a .worktreeinclude file at the repo root to list files Phase 4 copies into each new worktree. Useful for local config files not tracked in git:

# .worktreeinclude
.env.local
.env.test
config/local.json

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Edge Cases

| Situation | Behavior | |-----------|----------| | 0 open PRs | Display No open PRs. + stop | | Draft PR | Show in table, skip for review unless explicitly selected | | Unknown CI | Display ? in CI column | | Review agent timeout | Show partial error, continue with others | | gh pr diff empty | Skip this PR, notify user | | Very large PR (>5000 additions) | Warn: "Partial review, diff truncated" | | Collaborators API 403/404 | Fallback to last 10 merged PR authors | | Parallel agents unavailable | Run sequential reviews, notify user | | Phase 4: .gitignore missing .worktrees/ | Fail-fast, show fix instructions, stop Phase 4 | | Phase 4: branch already checked out | Warn with git worktree list hint, skip this PR | | Phase 4: stale cache (>30min) | Re-fetch PR list before creating worktrees | | Phase 4: PR modifies package.json | Warn in summary to run install manually | | Phase 4: 0 non-draft PRs | Display message + end Phase 4 |

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Notes

• Always derive owner/repo via gh repo view, never hardcode
• Use gh CLI (not curl GitHub API) except for collaborators list

…

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: FlorianBruniaux
• Source: FlorianBruniaux/claude-code-plugins
• License: MIT

Install and usage instructions live in the source repository linked above.