[dotancohen]

Here, found it:

  > Use XML tags to structure your prompts

  > There are no canonical “best” XML tags that Claude has been trained with in particular, although we recommend that your tag names make sense with the information they surround.

https://docs.anthropic.com/en/docs/build-with-claude/prompt-...

[justsomehnguy]

My guess would be there is enough training materiel what a mere tagging sometging is enough to have a bigger SNR.