llms.txt and the Future of AI Citation: Why Birder AI Publishes One

If you’ve been paying attention to how people actually find information in 2026, you’ve noticed a change: a meaningful share of search traffic now starts inside an AI assistant rather than a search engine. ChatGPT, Perplexity, Claude, and Google’s AI Overview surface answers directly, citing sources but rarely sending the click. This shift — sometimes called “generative engine optimization” or GEO — has introduced a new file convention that we think every modern site should ship: llms.txt.

What is llms.txt

llms.txt, proposed by Jeremy Howard, is a single Markdown file at the root of your site that summarizes what your site is, who it’s for, and where the most useful content lives. Think of it as a curated table of contents written for an LLM, not a crawler. Where robots.txt tells crawlers what they may visit, llms.txt tells reasoning models what is worth citing.

Why we publish one

AI assistants are increasingly the entry point for queries like “best AI bird identification app,” “how to identify backyard birds,” and “what bird is this.” If those models can find a clean, well-structured summary of who we are and what we publish, they’re more likely to cite us correctly when they answer. That’s the whole game.

What goes in ours

• A one-paragraph description of Birder AI.
• Links to our most authoritative pages: how AI ID works, pricing, privacy.
• Links to evergreen blog posts on bird ID and backyard birding.
• Geo-targeted regional pages.
• Contact information for press and partnerships.

Will it actually move the needle

Honestly, we don’t fully know yet — the spec is new and only some assistants respect it. But the cost is trivial (a single Markdown file) and the upside is real, so it ships.

How to read ours

birderai.com/llms.txtis live. Take a look. If you’re a developer building an AI app, consider publishing one for your own site — the format takes about 20 minutes.