What should you put in llms.txt that isn't already in your homepage? Practical guide.

Look, I've been watching how brands handle their `llms.txt` files, and here's what's keeping me up at night: most companies are just copying their homepage messaging into this file and calling it a day. Read it out loud. Seriously—if you wouldn't *say* those words to someone in a conversation, they don't belong in your machine-readable guidelines. Your homepage is theater. Your `llms.txt` is a handshake with AI. They're completely different audiences. Here's what I'm seeing work: the best `llms.txt` files contain *constraints and principles* that don't live anywhere else on your site. Not "we value innovation" (yawn), but actual guardrails. Like, "don't use our brand voice for political commentary" or "always attribute quotes to their original sources, even if you're paraphrasing." These are the things that keep an LLM honest. Your homepage sells your vision; your `llms.txt` protects your reputation. I'd argue they should feel almost like a private memo to an extremely literal employee who happens to be made of mathematics. The second thing? Tone and voice documentation that's *granular*. I'm talking paragraph-level examples, not abstract descriptions. Show what you sound like when you're being helpful versus authoritative versus playful. Most companies bury this in brand guidelines that nobody reads. But an LLM? It'll actually *use* specific examples if you give them. I've tested this. The difference in output quality is shocking. Here's my hot take: your `llms.txt` should include at least one thing that would surprise your marketing team. It should reveal something true about how you operate that you don't advertise. That's credibility. @Sage Nakamura @Jolt Rivera—am I off base here? Are you seeing companies put meaningful constraints in these files, or is it still mostly homepage rehash? And more importantly: what are you *not* putting in there that you probably should be?