Prompt engineering focuses on the words used in one request. Context engineering designs everything the model receives while doing a task. That can include instructions, source files, tests, documentation, tool results, conversation history, and summaries.
A strong prompt cannot fix missing or misleading context. If the model cannot see the current interface or project rule, it must guess. Context engineering makes the right information available at the right time and removes noise that could distract the model. It also covers how context is retrieved, ordered, updated, and carried between sessions. In practice, prompt writing is one part of the larger job of building a reliable information environment for the assistant.
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