Everything published in April 2026.

Articles from April 2026

• Evaluation and Security Apr 30, 2026 ·10 min read

  Guardrails as Policy Enforcement, Not Keyword Blocking

  Building layered input, action, and output controls that remain testable when language and threats change.

• Evaluation and Security Apr 21, 2026 ·10 min read

  Threat Modeling an AI Application End to End

  Assets, trust boundaries, model-specific attacks, tool abuse, data leakage, and concrete mitigations for deployed AI systems.

• Evaluation and Security Apr 12, 2026 ·14 min read

  Prompt Injection Defense in Depth

  Why delimiters are not a sandbox, how indirect injection reaches agents, and which architectural controls actually reduce impact.

• Retrieval Apr 3, 2026 ·10 min read

  Embedding Systems: Models, Indexes, and Semantic Drift

  Selecting representations, constructing embedding inputs, migrating indexes, and detecting when semantic neighborhoods stop serving the product.