Assume the guardrail fails The best-scoring open guard model answers 91% correctly on public benchmark prompts and 33.8% on ones it has not seen. That gap should change how you build, not which model you pick. 2026 AWS Blocks and the hard 20% A framework that makes local RAG feel like magic, until you deploy. Where the abstraction held, where it leaked, and what I'd reach for it for. 2026 Making an AI agent reliable Three times building one agent, the same bug bit me. Each time the fix was the same principle: never let the model hold a value that has to be exact. 2026