gha

name	gha
description	Analyze GitHub Actions failures and identify root causes. Use when asked to investigate a CI/CD GitHub Actions failure and recommend a fix.
argument-hint	<url>
disable-model-invocation	true

Investigate this GitHub Actions URL: $ARGUMENTS

Use the gh CLI to analyze this workflow run. Your investigation should:

1. Get basic info & identify actual failure:

   • What workflow/job failed, when, and on which commit?
   • CRITICAL: Read the full logs carefully to find what SPECIFICALLY caused the exit code 1
   • Distinguish between warnings/non-fatal errors vs actual failures
   • Look for patterns like "failing:", "fatal:", or script logic that determines when to exit 1
   • If you see both "non-fatal" and "fatal" errors, focus on what actually caused the failure

2. Check flakiness: Check the past 10-20 runs of THE EXACT SAME failing job:

   • IMPORTANT: If a workflow has multiple jobs, you must check history for the SPECIFIC JOB that failed, not just the workflow
   • Use gh run list --workflow=<workflow-name> to get run IDs, then gh run view <run-id> --json jobs to check the specific job's status
   • Is this a one-time failure or recurring pattern for THIS SPECIFIC JOB?
   • What's the success rate for THIS JOB recently?
   • When did THIS JOB last pass?

3. Identify breaking commit (if there's a pattern of failures for the specific job):

   • Find the first run where THIS SPECIFIC JOB failed and the last run where it passed
   • Identify the commit that introduced the failure
   • Verify by checking: does THIS JOB fail in ALL runs after that commit? Does it pass in ALL runs before?
   • If verified, report the breaking commit with high confidence

4. Root cause: Based on logs, history, and any breaking commit, what's the likely cause?

   • Focus on what ACTUALLY caused the failure (not just any errors you see)
   • Verify your hypothesis against the logs and failure logic

5. Check for existing fix PRs: Search for open PRs that might already address this issue:

   • Use gh pr list --state open --search "<keywords>" with relevant error messages or file names
   • Check if any open PR modifies the failing file/workflow
   • If a fix PR exists, note it in your report and skip the recommendation section

Write a final report with:

• Summary of failure (what specifically triggered the exit code 1)
• Flakiness assessment (one-time vs recurring, success rate)
• Breaking commit (if identified and verified)
• Root cause analysis (based on the ACTUAL failure trigger)
• Existing fix PR (if found - include PR number and link)
• Recommendation (skip if fix PR already exists)