[krackers]

All system prompts are already wrapped in specific role markers (each LLM has its own unique format), so I'm sure every lab is familiar with the concept of delimters, in-band vs out-of-band signalling and such.

It'd not clear why within any section XML markers would do better than something like markdown, other than claude being explicitly post-trained with XML prompts as opposed to markdown. One hypothesis could be that since a large portion of the training corpus is websites, XML is more natural to use since it's "learned" the structure of XML better than markdown. Another could be that explicit start/end tags make identifying matching delimiters easier than JSON (which requires counting matching brackets) or markdown (where the end of a section is implicitly defined by the presence of a new header element).