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Series

Series

Multi-part builds, each one written in order: every part assumes the previous one and ends with code that runs.

3
series
31
parts
Series13 partsComplete

React Native → Swift

Native iOS for senior React Native engineers: what really changes in Swift, SwiftUI, state, navigation, data, concurrency, persistence, tooling and the App Store, and what you can only do in native.

Sep 2026≈ 3 h total read
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  1. 01Why a senior React Native developer should learn native in 20261 Sep · 17 min
  2. 02Swift for people who already master TypeScript: the five differences that change how you design2 Sep · 17 min
  3. 03SwiftUI is not React, even if it looks like it: body, identity, modifiers and layout3 Sep · 16 min
  4. 04State and architecture in SwiftUI: from Zustand and Redux to @Observable and TCA4 Sep · 16 min
Series8 partsComplete

Agent loop

Building a coding agent from scratch, one loop at a time, every part in runnable code.

Jun 2026 — Aug 2026≈ 3 h total read
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  1. 01What an agent loop is (and isn't): state, action, stop29 Jun · 12 min
  2. 02The simplest loop that works: a write-test-fix agent, step by step30 Jun · 24 min
  3. 03The sandbox in an agent loop: from the model's text to a reliable observation30 Jun · 21 min
  4. 04Who writes the agent's tests: three ways to define what's correct30 Jun · 24 min
Series10 partsIn progress

Deep Agents

Building a website auditor with deepagents, one harness layer per post: tools, filesystem, permissions, sandbox, context, skills, and delegation.

Latest · Part 017 Aug 2026
Start with part 01 →
  1. 01What an agent harness is (and when not to use one): deepagents vs LangGraph7 Aug · 14 min
  2. 02Your first deep agent: create_deep_agent with frontier and open-weight modelsComing soon
  3. 03Custom tools and MCP in deepagents: Python functions, LangChain tools, and MCP serversComing soon
  4. 04Threads, checkpointers, and human-in-the-loop in deepagents: approving tool calls before they runComing soon