llms.txt was a proposal, not a standard. No major lab had committed to reading it in production, and the honest case against building it was that we’d be shipping support for a file nobody consumed.
I argued the file was not the point. Writing a structured, accurate, machine-readable description of your own product is a discipline, and the teams that could do it would be ready for whatever format won. So we generated it automatically for every customer rather than making it a checkbox somebody had to find.
Fourteen months later, still no major lab has committed to reading llms.txt. Google has said publicly it doesn’t use it. The prediction I made in the essay at the time was that the format might not last while the discipline would, and that’s roughly where things sit. I count the call as right and the file as still unproven, which are two different things.
I wrote the whole thing up, including what we got wrong.