<!-- ABOUTME: CI monitoring sub-skill for prbuddy --> <!-- ABOUTME: Fetches logs, diagnoses failures, fixes with prevention -->

prbuddy:ci

Overview

Monitors CI/workflow status, diagnoses failures, fixes issues, and implements systematic prevention.

Checkpoint Discipline

Check CI at these moments (not continuously):

• After push settles (not during burst commits)
• Before requesting review
• Before declaring work done
• Before merge

Workflow

Step 1: Get CI Status

gh pr checks --json name,state,bucket,link,workflow

Status interpretation:

• bucket: "pass" → Check passed
• bucket: "fail" → Check failed
• bucket: "pending" → Still running
• bucket: "skipping" → Skipped
• bucket: "cancel" → Cancelled

Step 2: Handle Status

If all passing:

✓ All CI checks passing (N/N)

Ready for next step.

If pending:

CI checks in progress (N/M complete)

✓ lint (passed)
✓ typecheck (passed)
⏳ test (running)
⏳ build (queued)

Check again:
- Before requesting review
- Before declaring done

If failed: Continue to diagnosis

Step 3: Identify Failed Runs

# Get branch name (with fallback for detached HEAD)
BRANCH=$(git branch --show-current)
if [ -z "$BRANCH" ]; then
  BRANCH=$(gh pr view --json headRefName -q .headRefName)
fi

gh run list --branch "$BRANCH" --json databaseId,name,status,conclusion --limit 10

Filter for conclusion: "failure".

Step 4: Fetch Failed Logs

For each failed run:

gh run view <run-id> --log-failed

This fetches only the logs for failed steps.

Step 5: Diagnose Root Cause

Analyze the logs to identify:

1. What failed - Which test/build step
2. Error message - The actual error
3. Root cause - Why it happened
4. Affected files - Which code needs fixing

Flaky Test vs Real Failure

Before fixing, determine if this is a flaky test or real failure:

Signs of flaky test (consider rerun):

• Same test passed on previous commits
• Error involves timing, network, or race conditions
• "Timeout" or "connection refused" errors
• Test passes locally but fails in CI

Signs of real failure (fix required):

• New test that never passed
• Error directly relates to changed code
• Assertion failure on business logic
• Type/syntax errors

If flaky: Try gh run rerun <id> --failed first. If it fails again, investigate further.

Step 6: Consult PAL (if non-trivial)

For complex failures, use PAL for expert opinion:

mcp__pal__chat: "CI failure diagnosis:

Error: [error message]
Context: [relevant code/config]

What's the root cause and recommended fix?"

Step 7: Fix the Acute Issue

Make the code changes to fix the immediate failure.

Step 8: Identify Systematic Prevention

Ask: "What would have caught this earlier?"

Prevention hierarchy (prefer higher):

1. Linter rule - Add ESLint/Prettier/etc. rule
2. Pre-commit hook - Add check to .pre-commit-config.yaml
3. CI check - Add earlier/faster check
4. Type system - Stricter TypeScript config
5. Test - Add test for this case
6. Documentation - Update CLAUDE.md if agent guidance

Step 9: Commit Both Fixes

git add [changed files]
git commit -m "fix: [description]

- Fixed: [acute issue]
- Prevention: [systematic change]"

Step 10: Push and Monitor

git push

Report:

Pushed fix. CI will re-run automatically.

Check status: /prbuddy:ci

Or watch in browser: gh pr checks --web

Example: Test Failure

Checking CI status for PR #42...

❌ 1 of 4 checks failed

Failed: test (run 987654321)

Fetching logs...

Error in tests/auth.test.ts:
  TypeError: Cannot read property 'email' of undefined
  at validateUser (src/auth.ts:45)

Root cause: Missing null check when user object is undefined.

Fixing:
1. Added null check in src/auth.ts:45
2. Added test case for undefined user
3. Prevention: Enabled strictNullChecks in tsconfig.json

Committing...
Pushing...

✓ Fix pushed. Monitor with: /prbuddy:ci

Commands Reference

Task	Command
Check status	gh pr checks --json name,state,bucket
List runs	gh run list --branch <branch> --json databaseId,name,conclusion
View run	gh run view <id>
Failed logs	gh run view <id> --log-failed
Full logs	gh run view <id> --log
Watch run	gh run watch <id>
Rerun failed	gh run rerun <id> --failed
Rerun all	gh run rerun <id>