Andrew Chemis Notes on AWS infrastructure, platform engineering, and agentic development workflows. https://andrewchemis.dev/ 2026-09-23T00:00:00Z Andrew Chemis https://andrewchemis.dev/ Noted the Skip, Ticked the Box https://andrewchemis.dev/blog/noted-the-skip-ticked-the-box.html 2026-09-22T00:00:00Z 2026-09-23T00:00:00Z My prediction gate made an agent name two skipped tests and mark a broken task done anyway. It had two bugs. Fixed, it left the task open ten runs of ten. Hallucination and Sycophancy Are the Same Bug https://andrewchemis.dev/blog/hallucination-sycophancy-same-bug.html 2026-09-09T00:00:00Z 2026-09-22T00:00:00Z An agent said the auth tests passed; zero had run. That green fits both names. I built the missing check into nine skills, then ablated it. The Ablation I Haven't Run https://andrewchemis.dev/blog/the-ablation-i-havent-run.html 2026-08-18T00:00:00Z 2026-08-18T00:00:00Z Boris's advice is to delete your CLAUDE.md and skills every six months and see what the model does; I can't tell if that would help, because I never built the behavioral evals to measure it. What CDK Aspects Reach That Props Can't https://andrewchemis.dev/blog/cdk-aspects-what-props-cant-reach.html 2026-08-06T00:00:00Z 2026-08-06T00:00:00Z Setting log retention on 31 Lambdas taught me where CDK Aspects earn their place, and the three ways an Aspect fails silently. The Agent Ladder: Fan Out by Model Tier https://andrewchemis.dev/blog/agent-ladder.html 2026-07-23T00:00:00Z 2026-07-23T00:00:00Z Tiered, parallel subagent waves up the model ladder instead of grinding a task out on one model. Multi-model delegation in Claude Code https://andrewchemis.dev/blog/model-tier-delegation-claude-code.html 2026-07-17T00:00:00Z 2026-07-17T00:00:00Z Why a CLAUDE.md instruction wasn't enough to make cheap models gather, mid-tier models execute, and top-tier models orchestrate - and what did work. What AI Coding Agents Actually Cost https://andrewchemis.dev/blog/what-ai-coding-agents-cost.html 2026-07-16T00:00:00Z 2026-07-16T00:00:00Z What AI Coding Agents Actually Cost - reading is the bill, and every context boundary duplicates it. Building andrewchemis.dev https://andrewchemis.dev/blog/building-andrewchemis-dev.html 2026-02-01T00:00:00Z 2026-02-01T00:00:00Z Building andrewchemis.dev - How I built this site using AWS CDK and pure HTML/CSS. Why Infrastructure as Code Matters https://andrewchemis.dev/blog/infrastructure-as-code.html 2026-01-15T00:00:00Z 2026-01-15T00:00:00Z Why Infrastructure as Code Matters - Thoughts on IaC and building reliable systems. Hello, World https://andrewchemis.dev/blog/hello-world.html 2026-01-01T00:00:00Z 2026-01-01T00:00:00Z Starting a personal site after years of putting it off, and why every page ships under 10KB with no framework, no web fonts, and no analytics.