Human Approval as a System Boundary

Design human approval around an exact operation, with reviewable payloads, durable decisions, expiry, and execution checks that survive retries.

September 6, 2026 · 13 min · Lukas Walter

Trust Boundaries Around AI Features

How to keep model proposals separate from trusted application behavior with authorization, approval policy, current-state checks, and least privilege.

August 9, 2026 · 20 min · Lukas Walter

Indirect Prompt Injection Is a Trust Boundary Problem

Indirect prompt injection is a trust-boundary failure; treat retrieved content as untrusted data, isolate it from instructions, and validate actions before execution.

March 23, 2026 · 7 min · Lukas Walter