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World's Fair 2025

12-Factor Agents: Patterns of reliable LLM applications — Dex Horthy, HumanLayer

Dex Horthy

Overview

This talk proposes the "12-Factor Agents" pattern, drawing parallels to the 12-Factor App methodology for building reliable software. The core thesis is that building robust LLM applications requires applying established software engineering principles, focusing on modularity, control flow, and state management rather than solely relying on agentic capabilities. The approach emphasizes treating agents as software components that can be engineered for reliability and maintainability.

Who should watch

Key takeaways

Notable quotes

*Tool use is harmful.* (This is not about giving an agent access to the world, but rather the idea that tool use is a magical thing where an ethereal alien entity is interacting with its environment.)
*Agents are just software, so let's build software.*
*Everything in making agents good is context engineering.*

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Unofficial community note. Prefer the recording for nuance.