skinnyandbald/repo-audit

Repo Audit

Audit GitHub repo security settings and hygiene. Detect drift, report findings, optionally auto-fix.

Invocation

/repo-audit                    # audit all active repos (default org: skinnyandbald)
/repo-audit <repo>             # audit one repo (e.g. skinnyandbald/cos-bot)
/repo-audit --fix              # audit + auto-fix what's fixable
/repo-audit <org>              # audit all active repos in a specific org
/repo-audit <repo> --fix       # audit one repo + fix

Workflow

Step 0: Preflight -- Token Permission Check

Before running any checks, verify the token has sufficient permissions:

# Check token is valid
gh api /user

# Check repo scope by testing vulnerability alerts on first repo
gh api repos/{first-repo}/vulnerability-alerts

If either call fails, warn the user and skip security settings checks (dependabot-alerts, dependabot-autofixes). Report clearly:

WARNING: Token permission check failed. Ensure your token has `repo` scope.
  Security settings checks will be skipped.

Continue with remaining checks (dependabot-config, semgrep-syntax, stale-prs, stale-branches, actions-pinned) that only require read access.

Step 1: Build Repo List

Single-repo mode: If a specific repo was provided (contains /), use that repo directly. Skip to Step 2.

Org mode: List all active repos for the org (default: skinnyandbald).

Active repos = non-archived repos with a push in the last 180 days.

CUTOFF=$(date -v-180d +%Y-%m-%dT%H:%M:%SZ)   # macOS; use `date -d '-180 days'` on Linux
gh repo list {org} --limit 200 --json nameWithOwner,isArchived,pushedAt --no-archived \
  --jq --arg cutoff "$CUTOFF" '.[] | select(.pushedAt > $cutoff) | .nameWithOwner'

Report the repo count before proceeding: "Found N active repos in {org}."

Step 2: Run All Checks

For each repo, run every check below. Collect all results into three buckets: Critical, Warning, Clean.

Rate limit awareness: If auditing 50+ repos, add a 1-second pause between repos (sleep 1).

---

Check Definitions

1. dependabot-alerts (Critical, Auto-fixable)

Verify vulnerability alerts are enabled at the repo level.

gh api repos/{repo}/vulnerability-alerts
# 204 = enabled, 404 = disabled

A 404 response means alerts are disabled.

2. dependabot-autofixes (High, Auto-fixable)

Verify automated security fixes are enabled.

gh api repos/{repo}/automated-security-fixes
# Check the response JSON -- `enabled` field

3. dependabot-config (High, Auto-fixable)

Verify .github/dependabot.yml exists in the repo.

gh api repos/{repo}/contents/.github/dependabot.yml
# 404 = missing

4. semgrep-syntax (High, Auto-fixable)

Scan all *.yml files under .github/workflows/ for any file that contains both semgrep ci and --config auto on the same line or in the same step.

# List workflow files
workflows=$(gh api repos/{repo}/contents/.github/workflows --jq '.[].name' 2>/dev/null)

# For each workflow file, fetch content and check
for wf in $workflows; do
  content=$(gh api repos/{repo}/contents/.github/workflows/$wf --jq '.content' | base64 -D)
  if echo "$content" | grep -q 'semgrep ci' && echo "$content" | grep -q '\-\-config auto'; then
    # Flag this file
    echo "FAIL: $wf contains semgrep ci with --config auto"
  fi
done

5. stale-prs (Low, Report only)

Find open PRs older than 30 days.

gh pr list --repo {repo} --state open --json number,title,createdAt,author \
  --jq '.[] | select(.createdAt < "'$(date -v-30d +%Y-%m-%dT%H:%M:%SZ)'")'

Report count and PR numbers/titles.

6. stale-branches (Low, Report only)

Find branches with tip commit older than 60 days, excluding:

• The default branch
• dependabot/*, renovate/*, release/* prefixes
• Any branch that has an open PR (source or target)

# Get all open PR source and target branches (to exclude them)
open_pr_branches=$(gh api repos/{repo}/pulls --jq '.[].head.ref, .[].base.ref' | sort -u)
default_branch=$(gh api repos/{repo} --jq '.default_branch')

gh api repos/{repo}/branches --paginate | jq -r '.[].name' | while read branch; do
  # Skip default branch
  [[ "$branch" == "$default_branch" ]] && continue
  # Skip dependabot/renovate/release branches
  [[ "$branch" =~ ^(dependabot|renovate|release)/ ]] && continue
  # Skip branches with open PRs
  echo "$open_pr_branches" | grep -qx "$branch" && continue

  # URL-encode branch name to handle slashes and special chars
  encoded_branch=$(python3 -c "import urllib.parse, sys; print(urllib.parse.quote(sys.argv[1], safe=''))" "$branch")

  # Check tip commit date
  committed_at=$(gh api "repos/{repo}/git/refs/heads/${encoded_branch}" --jq '.object.url' \
    | xargs gh api --jq '.commit.committer.date')

  # Flag if older than 60 days
  cutoff_60d=$(date -v-60d +%Y-%m-%dT%H:%M:%SZ)
  if [[ "$committed_at" < "$cutoff_60d" ]]; then
    echo "STALE: $branch (last commit: $committed_at)"
  fi
done

7. actions-pinned (High, Report only)

Scan workflow files for third-party GitHub Actions that are NOT pinned to a SHA.

A uses: line is flagged if ALL of these are true:

• The action owner is NOT actions/* or github/* (first-party exclusions)
• The ref after @ is NOT a 40-character hexadecimal SHA

This catches @main, @master, @v1, @v1.2.3, and any other non-SHA ref.

# For each workflow file, fetch and scan
for wf in $workflows; do
  content=$(gh api repos/{repo}/contents/.github/workflows/$wf --jq '.content' | base64 -D)
  # Find uses: lines with non-SHA refs for third-party actions
  echo "$content" | grep -E '^\s*uses:\s*' | while read line; do
    # Extract action ref (owner/repo@ref)
    action=$(echo "$line" | sed 's/.*uses:\s*//' | tr -d '"' | tr -d "'")
    owner=$(echo "$action" | cut -d'/' -f1)
    ref=$(echo "$action" | sed 's/.*@//' | cut -d' ' -f1)

    # Skip first-party actions
    [[ "$owner" == "actions" || "$owner" == "github" ]] && continue

    # Check if ref is a 40-char hex SHA
    if ! echo "$ref" | grep -qE '^[0-9a-f]{40}$'; then
      echo "UNPINNED: $wf uses $action"
    fi
  done
done

---

Step 3: Report

Format results as a markdown report with three sections:

## Repo Audit Results

### Critical Issues
| Repo | Check | Details |
|------|-------|---------|
| cos-bot | dependabot-alerts | Disabled |

### Warnings
| Repo | Check | Details |
|------|-------|---------|
| prompto | stale-prs | 3 PRs older than 30 days |
| dear-ben | actions-pinned | 2 unpinned actions in ci.yml |

### All Clear
dear-ben, SecondBrain, distil (12 repos clean)

**Summary:** 2 critical, 3 warnings, 12 clean

Map check severities to report sections:

• Critical Issues: dependabot-alerts (Critical severity)
• Warnings: dependabot-autofixes, dependabot-config, semgrep-syntax, actions-pinned (High severity), stale-prs, stale-branches (Low severity)
• All Clear: repos with zero findings

If --fix was NOT passed, remind the user: "Run /repo-audit --fix to auto-fix fixable issues."

---

Step 4: Auto-Fix (only with --fix flag)

If --fix was not passed, STOP here. Do not modify anything.

Auto-fixable checks fall into two categories:

Settings Fixes (API PUT, no git required)

dependabot-alerts:

gh api repos/{repo}/vulnerability-alerts --method PUT

dependabot-autofixes:

gh api repos/{repo}/automated-security-fixes --method PUT

Content Fixes (GitHub Contents API, no clone required)

dependabot-config -- create .github/dependabot.yml with the default template (see below).

Only push if the repo has a package.json (npm ecosystem) or .github/workflows/ (actions ecosystem). Skip repos with neither.

For new file creation, omit the sha field:

# Check for ecosystem markers before fixing
if ! gh api repos/{repo}/contents/package.json &>/dev/null && \
   ! gh api repos/{repo}/contents/.github/workflows &>/dev/null; then
  echo "Skipping {repo}: no npm or actions ecosystem found."
  continue
fi

# Write template to temp file
cat > /tmp/dependabot.yml << 'DEPBOT'
version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 10
    cooldown:
      default-days: 7
      semver-major-days: 14
      semver-minor-days: 7
      semver-patch-days: 3
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 5
    cooldown:
      default-days: 3
DEPBOT

gh api repos/{repo}/contents/.github/dependabot.yml \
  --method PUT \
  -f message="chore: add dependabot config" \
  -f content="$(base64 < /tmp/dependabot.yml)"

semgrep-syntax -- update each offending workflow file to remove --config auto.

Scan ALL *.yml files under .github/workflows/ (not just security.yml).

# Get current file content and SHA
sha=$(gh api repos/{repo}/contents/.github/workflows/{file} --jq '.sha')
content=$(gh api repos/{repo}/contents/.github/workflows/{file} --jq '.content' | base64 -D)

# Remove --config auto from the content
fixed_content=$(echo "$content" | sed '/semgrep ci/s/--config auto//g')

# Write fixed content to temp file
echo "$fixed_content" > /tmp/fixed-workflow.yml

# Push fix via Contents API
gh api repos/{repo}/contents/.github/workflows/{file} \
  --method PUT \
  -f message="fix: remove --config auto from semgrep ci" \
  -f content="$(base64 < /tmp/fixed-workflow.yml)" \
  -f sha="$sha"

Default Dependabot Template

version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 10
    cooldown:
      default-days: 7
      semver-major-days: 14
      semver-minor-days: 7
      semver-patch-days: 3
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 5
    cooldown:
      default-days: 3

Fix Report

After applying fixes, report what was changed:

## Fixes Applied
| Repo | Check | Action |
|------|-------|--------|
| cos-bot | dependabot-alerts | Enabled via API |
| cos-bot | dependabot-config | Created .github/dependabot.yml via Contents API |
| prompto | semgrep-syntax | Removed --config auto from security.yml |

---

Constraints

1. Never modify repo code. Only repo settings and config files under .github/.
2. Read-only by default. Only apply fixes when the --fix flag is passed.
3. Skip archived repos. The repo list query already filters these out.
4. Org-agnostic. Works with any GitHub org. Default to skinnyandbald if none specified.
5. Rate limits. If auditing 50+ repos, add sleep 1 between repos to avoid hitting GitHub API rate limits.
6. macOS date commands. Use date -v-Nd syntax (macOS). On Linux, use date -d '-N days' instead.
7. No cloning. All checks and fixes use the GitHub API directly. No git clone needed.
8. Confirm before fixing. When --fix is passed, show the audit report FIRST, then confirm with the user before applying fixes. List exactly what will be changed.