Build notes, lessons learned, and technical essays by Aymeric Dijoux. Not a regular blog — I write when I have something worth sharing.
Based in Paris · Épinay-sur-Orge (Essonne) & Réunion Island
An entire access-control design rested on a line of code that doesn't exist. The code wasn't wrong — the ground was. Here's why a fabricated line number is an agent's most effective lie, and the guardrail that catches it.
Family apps are very good at filing a household's information. None of them change who has to think about it. Building Noan, I spent more time on that shift than on every feature combined — and on the tightrope it forces: making invisible work visible without keeping score.
42 sessions, 913 messages, 155 commits. The report doesn't show what I thought I was doing — it shows what I actually do: hand over broad missions, let them run, and correct mid-flight instead of specifying upfront. Here's the loop, and what it costs.
They say it takes 14 steps to become an agentic AI engineer. Spoiler: real transformations fit into 5 architectural patterns. Here's how I learned it's no longer about talking to the model, but building a system that decides.
Perplexity is pulling back from MCP internally, and their reasons are real. But token bloat and weak permissions are a wiring problem, not a protocol one. Here's a POC that exposes my tools once and grants each agent only its slice.