AI agents need five layers, not just prompt engineering
blaizedsouza · x · 2026-07-24
- The post argues that prompt engineering is only the innermost of five layers that determine whether an AI agent ships or stays a demo.
- The layers expand outward as: prompt (single call), context (what the model knows before it starts), harness (tools, retries, validation, routing, sub-agents), loop (moving the outer loop into the system so work continues without the user), and graph (coordinating an organization of agents).
- The image reframes the model as a commodity and says the real engineering lives in the system around it.
Related event: AI Agent Engineering Shifts to Layers and Loops(5 posts)→
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