GitHub Actions Mainline Health Audit

Use this skill to detect unstable workflows on protected branches (main/master/release) before they silently degrade delivery confidence.

What this skill does

• Reads GitHub Actions run JSON exports
• Filters to mainline/protected branches (configurable regex)
• Groups by repository + workflow + branch + event
• Scores risk using:
• failure rate
• current consecutive failure streak
• days since last successful run
• Flags warning/critical groups based on configurable thresholds
• Emits text or JSON output for CI checks and ops dashboards

Inputs

Optional: - RUN_GLOB (default: artifacts/github-actions/*.json) - TOP_N (default: 20) - OUTPUT_FORMAT (text or json, default: text) - MIN_RUNS (default: 2) - MAINLINE_BRANCH_MATCH (default: ^(main|master|release.*)$) - WORKFLOW_MATCH (regex, optional) - WORKFLOW_EXCLUDE (regex, optional) - EVENT_MATCH (regex, optional) - EVENT_EXCLUDE (regex, optional) - REPO_MATCH (regex, optional) - REPO_EXCLUDE (regex, optional) - HEAD_SHA_MATCH (regex, optional) - HEAD_SHA_EXCLUDE (regex, optional) - CONCLUSION_MATCH (regex, optional) - CONCLUSION_EXCLUDE (regex, optional) - RUN_ID_MATCH (regex, optional) - RUN_ID_EXCLUDE (regex, optional) - RUN_URL_MATCH (regex, optional) - RUN_URL_EXCLUDE (regex, optional) - FAIL_WARN_PERCENT (default: 20) - FAIL_CRITICAL_PERCENT (default: 40) - STALE_SUCCESS_DAYS (default: 7) - WARN_SCORE (default: 30) - CRITICAL_SCORE (default: 55) - FAIL_ON_CRITICAL (0 or 1, default: 0)

Collect run JSON

gh run view <run-id> --json databaseId,workflowName,event,conclusion,headBranch,headSha,createdAt,updatedAt,startedAt,url,repository 
  > artifacts/github-actions/run-<run-id>.json

Run

Text report:

RUN_GLOB='artifacts/github-actions/*.json' 
MAINLINE_BRANCH_MATCH='^(main|release/.*)$' 
HEAD_SHA_MATCH='^[a-f0-9]{7,40}$' 
CONCLUSION_EXCLUDE='^(success)$' 
RUN_ID_MATCH='^50(0[1-5])$' 
MIN_RUNS=3 
bash skills/github-actions-mainline-health-audit/scripts/mainline-health-audit.sh

JSON output with fail gate:

RUN_GLOB='artifacts/github-actions/*.json' 
OUTPUT_FORMAT=json 
FAIL_ON_CRITICAL=1 
bash skills/github-actions-mainline-health-audit/scripts/mainline-health-audit.sh

Run with bundled fixtures:

RUN_GLOB='skills/github-actions-mainline-health-audit/fixtures/*.json' 
bash skills/github-actions-mainline-health-audit/scripts/mainline-health-audit.sh

Output contract

• Exit 0 in report mode (default)
• Exit 1 when FAIL_ON_CRITICAL=1 and one or more groups are critical
• Text mode prints summary + ranked mainline-risk groups
• JSON mode prints summary + scored groups + critical group details