llms.txt Isn't the End, but It Might Be the Front Door for Next-Gen Docs

While building AgentPort, one thought kept coming back: we used to write docs with humans as the default reader. For the next few years, more and more of those readers will be agents.

I first treated llms.txt as a minor feature. Now I see it more as a signal.

It was proposed on September 3, 2024, and as of March 2026 it is still mostly a de facto community standard, not a formal ISO or IETF standard. That does not make it less useful.

Its value is practical: it helps the model know where to start and what to read first.

Why this matters: agent workflows are changing from “read this page for a person” to “call information and tools directly inside a running flow.”

When that shift happens, model inference is not the biggest cost. The bigger costs are integration and reliability. If every website needs one-off integration work, this will never scale.

So this is the conclusion I trust more now: the future is not only stronger models. It is infrastructure that helps models retrieve correct information reliably.

• llms.txt is the entry layer.
• MCP and APIs are the invocation layer.
• Continuous updates and traceability are the foundation.

Whoever connects these three layers well gets closer to a truly usable agent era.