Google’s John Mueller responded to a question about whether Google’s search quality principles would change as AI agents increasingly crawl websites on users’ behalf. The answer may be more important to site owners than it seems at first glance.
Question about agent browsers and search quality principles
An SEO asked Mueller on Bluesky whether Google’s guidance on good user experiences, including principles around things like images and page design, would evolve as agentic AI tools gain the ability to navigate and retrieve information from websites autonomously.
The question reflects a growing concern in the SEO community as tools like Google Gemini become capable of crawling websites, performing tasks and returning answers to users without the user directly visiting a page.
They request:
“Hi John – Since computer use is now a built-in tool for Gemini 3.5 Flash, and as the agent becomes a “thing”, would you expect principles like “Images provide a satisfying experience” to evolve since the satisfying experience is an information agent? Any curiosities on your thoughts.”
Websites useful to humans will generally also work for agent browsers.
Mueller explained that most of Google’s existing quality principles will remain in place. A website that is useful to human users will generally also be useful to agent browsers.
He replied:
“I expect most of the principles will remain the same. A website that is useful for users will generally also be useful for agent browsers.”
Mueller’s answer means that it’s a good idea to continue making content useful to site visitors, which also involves the site’s layout, navigation, and internal links. AI agents do not change the fundamentals that Google’s algorithms continue to pick up on external user signals for ranking purposes, particularly signals that indicate the popularity of the site among users.
Blindly blocking agent browsers could become an SEO problem
Mueller’s response also included the observation that some details would evolve and that site owners should avoid blindly blocking agent browsers.
He said:
“Some details will undoubtedly evolve (and new basics – like… not blindly blocking agent browsers… will come into play), but ultimately it’s still the users.”
Mueller’s response draws a line between content quality and technical accessibility. A site can meet Google’s quality standards and still cause problems if AI agents can’t access or interact with its content.
In some ways, this is similar to how nofollow links became a problem for some sites when they were introduced many years ago. Some site owners blocked important sections of their websites in order to increase PageRank to pages they deemed important, giving no priority to truly important parts of a website like About Us pages.
The situation with agent browsers can follow a similar pattern, where technical decisions made for a single reason end up having unintended SEO consequences.
One way to think about it is that Google’s definition of a quality website is not being rewritten for the agentic era. The standards already in place were written for human users, and if AI agents serve human users, then satisfying those agents is arguably the same job. What’s changing are the technical considerations of hosting AI agents, not the underlying expectations of what a good website is.
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Featured image by Shutterstock/Mijansk786
