Context Engineering: Rebuilding Agent Windows from Multi-Source Memory
Roger_M_Taylor · x · 2026-08-29
An agent's context window is rebuilt every time it interacts with the LLM by combining several distinct components from different memory systems:
- System prompt: How to behave
- Message history: What just happened
- User facts: What it knows about you
- Retrieved facts: Relevant knowledge
- Tool schemas: What it can do
The key takeaway is that Context Engineering is the specific layer responsible for deciding which pieces are assembled and sent to the model. This highlights the technical complexity of integrating multi-source memory in agent architectures.
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