GitHub Actions Permission Scope Audit

Audit GitHub Actions workflow permission scope drift to enforce least-privilege token access.

Use this skill to detect over-broad GITHUB_TOKEN permissions and scope drift across GitHub Actions workflows.

What this skill does

• Reads workflow YAML files
• Detects explicit broad permission grants (write-all, contents: write, etc.)
• Flags risky patterns like pull_request_target workflows with write permissions
• Identifies workflows with no explicit permissions policy
• Emits text or JSON for CI triage and policy gates

Inputs

Optional:

• WORKFLOW_GLOB (default: .github/workflows/*.y*ml)
• TOP_N (default: 20)
• OUTPUT_FORMAT (text or json, default: text)
• WARN_SCORE (default: 2)
• CRITICAL_SCORE (default: 5)
• FLAG_MISSING_PERMISSIONS (0 or 1, default: 1)
• FLAG_WRITE_ALL (0 or 1, default: 1)
• FLAG_WRITE_SCOPES (0 or 1, default: 1)
• WORKFLOW_FILE_MATCH / WORKFLOW_FILE_EXCLUDE (regex, optional)
• EVENT_MATCH / EVENT_EXCLUDE (regex, optional)
• PERMISSION_MATCH / PERMISSION_EXCLUDE (regex, optional)
• FAIL_ON_CRITICAL (0 or 1, default: 0)

Run

Text report:

WORKFLOW_GLOB='.github/workflows/*.yml' \
bash skills/github-actions-permission-scope-audit/scripts/permission-scope-audit.sh

JSON output + fail gate:

WORKFLOW_GLOB='.github/workflows/*.yml' \
OUTPUT_FORMAT=json \
FAIL_ON_CRITICAL=1 \
bash skills/github-actions-permission-scope-audit/scripts/permission-scope-audit.sh

Run against bundled fixtures:

WORKFLOW_GLOB='skills/github-actions-permission-scope-audit/fixtures/*.yml' \
bash skills/github-actions-permission-scope-audit/scripts/permission-scope-audit.sh

Output contract

• Exit 0 in report mode (default)
• Exit 1 when FAIL_ON_CRITICAL=1 and one or more workflows are critical
• Text mode prints summary + ranked workflows
• JSON mode prints summary + ranked workflows + critical workflows