Context engineering versus prompt engineering
Quality depends on which evidence, state, and tools enter each turn, not only on prompt wording.
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The ideas to retain
First, what does “context” mean here?
The word context is overloaded. In this chapter, it means the effective input available to one specific inference.
Prompt engineering is one part of the problem
Prompt engineering still matters. Ambiguous, contradictory, or excessively prescriptive instructions can degrade behavior even when the rest of the system is sound.
Context is a snapshot, not the full application state
This distinction prevents a particularly dangerous mistake in agent systems: treating “the system knows X” as equivalent to “the model can use X now.”
Key moments
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