Build notes

Learning in public, one system at a time.

Clear explanations of the practical AI systems, product decisions, and engineering lessons I am studying while building TryDeputize.

6 notes · newest first

Agentic AI

MCP from First Principles: What It Is, Why It Exists, and How I Built a Wikipedia Research Assistant

MCP is a standard protocol connecting AI applications to tools, data and context. I built a small Wikipedia research assistant to find out what it does underneath the abstractions, and this is everything I learned while building it.

24 September 2026 · 30 min readRead the note

SpeechSynthesis: Crash CourseSpeechSynthesis is the text-to-speech half of the Web Speech API. It ships in every major browser, needs no key and no server, and this is the working set: the utterance, the global queue, voices and how they load, the events you can rely on, and the patterns that hold up in production.9 September 2026 · 16 min read
AWS EC2: Crash CourseEC2 gives you a virtual server in AWS to run your application on. This is the working set of concepts around it, from AMIs and security groups up to VPCs, load balancers and auto scaling, with the diagrams to hold them together.4 September 2026 · 6 min read
Agent Orchestration: A Complete GuideAgent orchestration is the coordination of multiple agents, tools and workflows toward one goal. It decides who works, on what, when, and how the results come back together.8 August 2026 · 8 min read
Loop Engineering: A Complete GuideLoop engineering is the design of the recurring control system around agent work. It replaces repeated manual prompting with a bounded, observable, verifiable process that directs agents toward a goal and knows when to stop.4 August 2026 · 19 min read
Harness Engineering: Complete GuideHarness engineering is the design of the complete environment around an AI model. It turns raw model capability into a system that can act, verify its work, recover from failure, and stop safely.29 July 2026 · 28 min read

Build notes go deep on one system at a time. The guides are the short, practical ones.

the tools these came from