Agentic Coding 09: Security & Design Upstream

The two most expensive decisions in any build — security and visual design — are cheapest to get right before a single line of application code exists. Learn how to red-team your own architecture in a fresh, dedicated session, lock the visual target as a throwaway HTML mockup, and keep separate concern sessions open as cheap insurance against lost context.

Where you'll use it

• Red-teaming an AI-generated architecture before any code is written
• Creating a visual mockup to lock UI design while iteration is free
• Keeping separate Claude sessions per concern to preserve context
• Running security reviews as a design-time gate rather than a post-build audit
• Fixing architecture vulnerabilities in batch after ranked review