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All posts →Context Engineering — Managing the Model's Working Memory
Prompt engineering tuned one message; context engineering designs the whole information flow around a finite window. It's the discipline behind agents that survive step 30 — and the sibling to harness and loop engineering. Here's the mental model, the failure mode (context rot), and the four moves that keep the window lean.
Loop Engineering — Stop Prompting, Start Designing the System
Direct prompting still works. But the practitioners closest to the frontier — Boris Cherny at Anthropic, Peter Steinberger, Addy Osmani — have all landed on the same shift: their job is to write loops that prompt the model, not to prompt the model themselves. Loop Engineering is the layer above harness engineering, and it changes what ‘shipping with an agent’ looks like.
Skills vs Subagents vs MCP — A Decision Tree
The three extension points look interchangeable at first glance. They aren't. Skills package knowledge, subagents package isolated reasoning, MCP servers package external access. Pick the wrong one and you'll end up rebuilding it — here's a decision tree and three worked scenarios.