Context Engineering: Deciding What Goes Into the Window
Article summary
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A language model has access to exactly one thing: the tokens sitting in its context window on this call. It does not remember your last session, it cannot see your database, and it has no idea what a tool returned unless that text is in the prompt right now. Everything the model appears to know is there because some part of your system decided to put it there. Context engineering is the discipline of making that decision well, on every request, under a hard token budget. It has quietly become…
1Key Takeaways
- A language model has access to exactly one thing: the tokens sitting in its context window on this call.
- It does not remember your last session, it cannot see your database, and it has no idea what a tool returned unless that text is in the prompt right now.
- Everything the model appears to know is there because some part of your system decided to put it there.
- Context engineering is the discipline of making that decision well, on every request, under a hard token budget.
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that a language model has access to exactly one thing: the tokens sitting in its context window on this call.
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