Dex, an AI engineer, introduces the 12 Factor Agents methodology, a set of principles for building reliable, scalable, and maintainable LLM-powered software. The framework, inspired by 12 Factor Apps,…
Dex Horthy, CEO and cofounder of HumanLayer, coined the term 'context engineering' and shared lessons from building AI agents, including that shipping unread code leads to disaster within months after…
Engineers are shifting focus from model selection to harness engineering—the design of prompts, tools, and scaffolding around AI models—after observing that a decent model with a great harness outperf…
Context engineering has emerged as a critical discipline in AI development, moving beyond prompt engineering to manage an AI's working memory. Developers are grappling with the challenge that models l…
A developer argues that an AI agent is defined by its event history, or 'log', rather than by its model, runtime, or execution loop. The log, an append-only record of all user inputs, model outputs, t…
A developer has found that CLAUDE.md files exceeding 200 lines cause AI models to ignore most of the content, with the effective instruction limit being around 150 rules. The project's solution places…