IDEAS, DECISIONS & LESSONS

Journal

Notes on AI, architecture and building useful products.

917 articles

26 Aug 2026 · 4 min read

agentic engineering

You Can't Ship Agents on Vibes — Evals for Agentic Systems

A one-line prompt tweak can silently break an agent, and you won't notice until a user does. My fix is an eval harness: a golden set of inputs and checks, run against every agent and workflow on every change. Here's the anatomy — deterministic checks, LLM-as-judge, run-on-change regression, and grading multi-agent workflows.

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25 Aug 2026 · 4 min read

agent architecture

Don't Choose Your Coding Agent — Make It a Plug-In

I already run a self-hosted autonomous engineer. When I wanted Cursor's cloud agents too, I didn't pick one — I made the executor swappable. Here's the integration architecture that turns any hosted coding agent into a first-class engine behind my own surface, in four small pieces.

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