What problem does it solve? Security is often skipped or checked only at the end of development. This Skill embeds security engineering into every phase of the Claude Code workflow — threat modeling before code is written, reviews while code changes, full audits before releases, and prompt-injection scanning before installing third-party skills. ## Core Features & Use Cases - DESIGN mode: STRIDE threat modeling with DREAD risk scoring (1-10) during planning, producing prioritized security requirements. - REVIEW mode: OWASP Top 10:2025 checks against code diffs, language-specific secure code patterns (JS/TS, Python, Go, Rust, Java, PHP, C/C++, Bash), secrets detection, and security header audits. - AUDIT mode: Full-project scans covering dependencies, configuration, attack surface mapping, and Agentic AI security (OWASP ASI01-ASI10). - SKILL-SCAN mode: Detects prompt injection attacks in external SKILL.md files across 8 attack categories (override, exfiltration, privilege escalation, destructive actions, settings manipulation, indirect injection, hidden instructions, social engineering) before installation. - Use Case: Before installing a skill from GitHub, run a SKILL-SCAN to verify it does not read your SSH keys, modify CLAUDE.md, or contain hidden instructions. ## Quick Start Ask Claude to run a security review of your recent code changes or scan a skill before installing it.