contrib-pr-review

name	contrib-pr-review
description	Review a contribution PR for safety, quality, and readiness. Checks for security concerns, test coverage, size appropriateness, and intent alignment. Use when reviewing external contributions.
argument-hint	<pr-number>
allowed-tools	Bash, Read, Grep, Glob, WebFetch

Contribution PR Review

Review PR #$ARGUMENTS from external contributor for safety, quality, and readiness.

Context

PR Metadata:

!`gh pr view $ARGUMENTS --repo homeassistant-ai/ha-mcp --json author,additions,deletions,files,commits,closingIssuesReferences,isDraft,reviews,url,title,body`

Contributor Stats:

!`gh api /repos/homeassistant-ai/ha-mcp/pulls/$ARGUMENTS --jq '{author: .user.login, user_id: .user.id}' | jq -r '.author' | xargs -I {} gh api /repos/homeassistant-ai/ha-mcp/contributors --jq '.[] | select(.login == "{}") | {login: .login, contributions: .contributions}'`

Files Changed:

!`gh api /repos/homeassistant-ai/ha-mcp/pulls/$ARGUMENTS/files --jq '.[] | {filename: .filename, status: .status, additions: .additions, deletions: .deletions, changes: .changes, patch: .patch}' | head -50`

Review Protocol

1. Check Gemini's Security Review

Note: Gemini Code Assist now handles security assessment automatically. Check if Gemini flagged any security concerns.

# Check if Gemini posted security-related comments
gh pr view $ARGUMENTS --repo homeassistant-ai/ha-mcp --json comments --jq '.comments[] | select(.author.login == "gemini-code-assist" or .body | contains("security") or contains("Security")) | {author: .author.login, body: .body}'

If Gemini flagged security issues:

• Review Gemini's findings carefully
• Verify if concerns are valid
• Do NOT approve until issues addressed or confirmed false positives

If NO Gemini security flags but you notice concerning patterns:

• Unusual AGENTS.md/CLAUDE.md changes unrelated to PR purpose
• .github/ workflow modifications with pull_request_target
• .claude/ agent/skill changes that could affect behavior
• Comment immediately with specific concerns

2. Enable Workflows (If Safe)

If security assessment passes and PR has workflow changes or new workflows:

# Check current workflow status
gh api /repos/homeassistant-ai/ha-mcp/pulls/$ARGUMENTS/requested_reviewers

# Enable workflows if not enabled (requires WRITE permission)
# This command may fail if already enabled - that's OK
gh api -X PUT /repos/homeassistant-ai/ha-mcp/actions/workflows/pr.yml/enable 2>/dev/null || echo "Workflows already enabled or no permission"

3. Test Coverage Assessment

Pre-existing tests (easier review if modified code is already tested):

# For each modified source file, check if tests exist
gh api /repos/homeassistant-ai/ha-mcp/pulls/$ARGUMENTS/files --jq '.[] | select(.filename | startswith("src/")) | .filename' | while read file; do
  basename=$(basename "$file" .py)
  echo "Checking tests for: $file"

  # Method 1: Look for test files by naming convention
  find tests/ -name "test_${basename}.py" -o -name "test_*${basename}*.py" 2>/dev/null | head -3

  # Method 2: Grep for function/class names from the modified file
  # Extract function/class names and search for them in tests
  grep -E '^(def|class|async def) [a-zA-Z_]' "$file" 2>/dev/null | head -5 | while read line; do
    name=$(echo "$line" | sed -E 's/.*(def|class) ([a-zA-Z_][a-zA-Z0-9_]*).*/\2/')
    if [ -n "$name" ]; then
      grep -r "$name" tests/ 2>/dev/null | head -1
    fi
  done
done

New tests added:

# Check if PR adds or modifies tests
gh api /repos/homeassistant-ai/ha-mcp/pulls/$ARGUMENTS/files --jq '.[] | select(.filename | startswith("tests/")) | {filename: .filename, status: .status, additions: .additions}'

Output Test Summary:

🧪 Test Coverage:
- Pre-existing tests: ✅ Modified code has tests / ⚠️ No tests for modified code
- New tests: ✅ PR adds X test files / ⚠️ No new tests
- Assessment: [Easy/Medium/Hard to review based on test coverage]

4. PR Size & Contributor Experience

Calculate PR size and assess appropriateness:

# From metadata: additions + deletions
total_lines=$(gh pr view $ARGUMENTS --repo homeassistant-ai/ha-mcp --json additions,deletions --jq '.additions + .deletions')
echo "Total lines changed: $total_lines"

# Get contributor experience
author=$(gh pr view $ARGUMENTS --repo homeassistant-ai/ha-mcp --json author --jq -r '.author.login')

# Check 1: Contributions to this project
project_contributions=$(gh api /repos/homeassistant-ai/ha-mcp/contributors --jq ".[] | select(.login == \"$author\") | .contributions" || echo "0")

# Check 2: Total GitHub commits (overall experience)
total_commits=$(gh api /users/$author --jq '.public_repos + .total_private_repos' 2>/dev/null || echo "unknown")

echo "Contributor: $author"
echo "Project contributions: $project_contributions"
echo "GitHub experience: $total_commits repos"

Assess:

• First-time to project (0-2 project contributions):

  • Check overall GitHub experience (repos, total commits)
  • < 200 lines: ✅ Excellent size
  • 200-500 lines: ⚠️ Large for first PR - may need extra guidance

  • 500 lines: 🔴 Too large - suggest splitting

• Regular contributor (3+ project contributions):

  • < 500 lines: ✅ Reasonable
  • 500-1000 lines: ⚠️ Large - ensure good test coverage

  • 1000 lines: 🔴 Very large - suggest splitting

• Experienced GitHub user (many repos/commits overall):

  • Adjust expectations - they may be new to this project but experienced overall

Output Size Summary:

📏 PR Size:
- Lines changed: [total]
- Contributor: [first-time / regular] ([X] contributions)
- Assessment: [size appropriateness]

5. Intent & Issue Linkage

Check linked issues:

# From metadata: closingIssuesReferences
gh pr view $ARGUMENTS --repo homeassistant-ai/ha-mcp --json closingIssuesReferences --jq '.closingIssuesReferences[] | {number: .number, title: .title}'

If issue linked:

• Read issue to understand expected outcome
• Compare PR changes to issue requirements
• Does PR solve the issue? Check:
  • All requirements addressed
  • No scope creep (extra features not requested)
  • Solution approach aligns with any discussed approaches in issue

If no issue linked:

• Is this a bug fix? Should reference issue
• Is this a feature? Should have issue for discussion
• Is this a typo/docs? OK without issue
• Recommend creating issue for tracking if it's a substantial change

Output Intent Summary:

🎯 Intent & Linkage:
- Linked issue: #X "title" / ⚠️ No issue linked
- Solves issue: ✅ Fully addresses requirements / ⚠️ Partial / ❌ Doesn't match
- Scope: ✅ Focused / ⚠️ Scope creep detected

6. Code Quality Overview

Note: Gemini Code Assist provides automated code review on all PRs. This step focuses on what Gemini cannot assess:

• Architecture alignment: Does it fit the project structure? (service layer usage, etc.)
• Breaking changes: Does it remove functionality without replacement? (Tool consolidation/refactoring is NOT breaking)
• Repo-specific patterns: Context engineering, progressive disclosure, MCP-specific conventions

Breaking change assessment:

• ✅ NOT Breaking: Tool consolidation, refactoring, parameter changes with same outcome achievable
• ⚠️ BREAKING: Removes functionality with no alternative, makes previously possible actions impossible

Quick checks:

# Check if ruff/mypy would complain (from workflow logs if available)
gh pr checks $ARGUMENTS --repo homeassistant-ai/ha-mcp | grep -E "(ruff|mypy|lint)"

# Check for common issues in diff
grep -E "(TODO|FIXME|XXX|HACK)" /tmp/pr_$ARGUMENTS.diff

Output Quality Summary:

✨ Code Quality:
- Architecture fit: [assessment - service layer, context engineering]
- Breaking changes: ✅ None / ⚠️ Detected - [describe what's genuinely lost]
- Gemini reviews: [check if Gemini flagged anything critical]

Final Review Summary

Output to User

After completing all steps, present a short summary of what the PR does and the review findings, then ask: "Should I post this comment to the PR?"

Draft PR Comment

After completing the analysis, draft a comment for the PR following these guidelines:

Comment Length:

• Good to merge: 10-15 lines
• Changes needed: Max 25 lines

Style:

• No emojis
• Markdown formatting OK (bold, lists, code blocks)
• Present inline in chat (not in a file)
• Always ask user before posting

Structure for "Good to Merge" (10-15 lines):

[Positive opening line about the contribution]

[1-2 sentences on what works well - focus on functionality, tests, architecture]

[Any minor suggestions or notes - optional, technical only]

[Closing line about readiness to merge]

Note: Do NOT mention security assessment in comment unless issues were found. Security checks are internal.

Structure for "Changes Needed" (max 25 lines):

[Positive opening line acknowledging the work]

[Brief summary of the issue being solved]

**[Concern 1]:**
[1-2 lines explanation + suggestion - focus on: tests, functionality, architecture, breaking changes]

**[Concern 2]:** (if applicable)
[1-2 lines explanation + suggestion]

**[Concern 3]:** (if applicable)
[1-2 lines explanation + suggestion]

[Closing line about next steps]

Note: Security concerns should be raised immediately when found, not in final structured comment.

Example - Good to Merge:

Great work on [feature/fix]. [Performance/quality metric] is impressive.

The implementation follows existing patterns and the [specific aspect] is well-designed. [Optional: Minor note about something noticed].

Ready to merge once CI passes.

Example - Changes Needed:

Thanks for tackling [problem]. [Metric/impact] shows this addresses a real need.

**Test coverage:**
Missing tests for the new [feature]. Please add at least one E2E test validating [behavior]. Performance tests not required.

**[Second concern if applicable]:**
[Brief explanation and request]

Once [change 1] and [change 2] are addressed, this should be good to merge.

Important Notes

• Security is checked, not publicized: Always check security (step 1), but only mention in comment if issues found
• Be constructive: Contributors are donating their time - be welcoming
• Focus on intent: Code quality can be iterated; intent misalignment is harder to fix
• Consider contributor experience: Adjust expectations based on contribution history
• Gemini already reviewed code: Don't duplicate detailed code review
• When in doubt: Err on the side of caution and request maintainer review