I saw these a couple of days ago, thought I'd post here. I don't know if this is relevant for the forum, but generally speaking it seems like a good idea.
Make your website accessible to LLM agents by serving plain Markdown when they request text/plain or text/markdown. Save tokens and improve agent experience with this simple Astro and Cloudflare Workers implementation.
www.skeptrune.com
Lightweight tool that converts traditional HTML pages to Markdown when being invoked by AI Agents to reduce token usage and improve readability. - thekevinm/HTML-to-MD-AI
github.com
Edit: I should have clarified that my thought was that perhaps XenForo have a plugin that serve Markdown instead of HTML if the content is being consumed by a bot. If not, perhaps they would be willing to make one, assuming there is interest from their customers.