Daniel Lopes

Anatomy and Architectures of Open-Source Agents

Study Guide: deep dive into how production and open-source coding agents work. Execution loops, tool calling, context management, memory systems, and…

Oct 12 • Daniel Lopes

What Is an Agent Harness? Parts, Architecture, and What to Know Before Building One

Study guide: learn what an AI agent harness is, how its runtime loop works, and key architectural decisions for building one that turns models into…

Oct 11 • Daniel Lopes

September 2026

Trunk-based development, feature branches, and what teams running agents actually do

A study guide to trunk-based development, feature branches, and what teams are doing now that AI agents write most of the code.

Sep 5 • Daniel Lopes

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August 2026

Apple history, behind the scenes: 50 stories from the people who built the Mac, NeXT, iPod and iPhone

Fifty stories from the CHM oral histories: how they got stuck, who said no, and what it cost to ship.

Aug 30 • Daniel Lopes

Apple History: how a failed company saved Apple

Apple bought NeXT for its operating system, not its CEO. Within a year the acquired company was running the acquirer.

Aug 30 • Daniel Lopes

Apple History in Their Own Words: A Guide to Oral Histories and Archival Footage

Every recorded interview with the people who rebuilt the company

Aug 29 • Daniel Lopes

Spec-driven development: what it is and how we do it differently

Definition + how we approach SDD here at GrowthX

Aug 28 • Daniel Lopes

How to define your Ideal Customer Profile (ICP)

An in-depth study guide to ideal customer profiles: what they are, what they aren't, and how to build one.

Aug 24 • Daniel Lopes

Paul Graham's essays, as audio

A collection of Paul Graham's essays, converted to audiobook for listening on the go.

Aug 24 • Daniel Lopes

Highlights from Hartmut Esslinger's Oral History

A Computer History Museum oral history, converted to audio: 85 minutes with the designer behind Apple's industrial design before Jony Ive.

Aug 22 • Daniel Lopes

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August 2025

EDD: Evals Driven Development

The ideal LLM-dev environment that I wish was easier to do…

Aug 10, 2025 • Daniel Lopes

December 2024

Prompt engineering in 2026: what still holds up

Role prompting lost its accuracy claim, self-consistency collapsed, chain-of-thought got narrower. Re-scoring 58 techniques against two years of…

Dec 22, 2024 • Daniel Lopes

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