Start with the mechanism
Three steps to keep in mind
- 1
Reserve output space
A system must leave enough capacity for the answer it wants to generate.
- 2
Prioritize the input
Instructions and relevant evidence compete with history and supporting material.
- 3
Handle overflow
Applications may truncate, summarize, retrieve selectively, or reject oversized input.
Try it yourself
The lab isolates this mechanism with a small, transparent simulation. Everything runs locally in your browser.
Open “Build a context window”Keep these three ideas
Go deeper when you need it
Technical detailWhat the short version leaves out
Attention lets positions exchange weighted information, but it does not mean every token influences the output equally.
A KV cache speeds up repeated decoding calculations; it is not durable user memory.
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