Role Plus XML Is a Boundary System
Design role and XML sections that separate responsibilities and reduce prompt ambiguity.
Most prompt ambiguity is really boundary ambiguity. What role plus XML actually does A role prompt gives the model a job identity. XML tags give the prompt internal architecture. That makes it easier for the model to distinguish instructions, examples, context, and live input. Why advanced stacks need it Few-shot blocks should be learn-from-this material, not evidence. Chain-of-thought scaffolds should describe the reasoning process, not become part of the final answer. Prompt chaining often passes structured outputs from one step to the next, and XML tags make those handoffs much more reliable. Design rule Use tags that correspond to real…
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