When I published “The Camino Ingles” back in 2017, Amazon book marketing was pretty simple. You’d load your title with keywords—”Camino Santiago Pilgrimage Walking Spain Guide”—upload your manuscript, and wait for readers to find you through the search bar.

That approach is mostly dead now.

If you’ve checked your dashboard lately and something feels off about how your books are surfacing, you’re not imagining it. Amazon has deployed two AI systems—Rufus (recently rebranded as Alexa for Shopping in the US) and COSMO—that have changed how travel books, memoirs, and adventure guides get discovered.

The New Sheriffs in Town

These aren’t search upgrades. Rufus is the conversational layer—the AI assistant that over 250 million customers now use to ask things like “What’s a good walking book for beginners?” or “I want to read about spiritual journeys.” COSMO is the reasoning engine underneath, using contextual logic to figure out what readers actually mean by vague searches.

When I dug into my Camino book’s performance over the past year, I found that most new readers weren’t arriving through traditional keyword searches anymore. They were asking Rufus things like “books about walking adventures in Spain” or “pilgrimage stories for inspiration.” The discovery path had quietly shifted.

So What Exactly Are These Things?

Think of them this way: Rufus is the friendly face, COSMO is the brain.

Rufus is the conversational AI assistant that over 250 million customers are now chatting with. Instead of typing “romance books,” they’re asking full questions like “What’s a good enemies-to-lovers romance that won’t make me cry?” Much more specific, much more telling about what they actually want.

COSMO is the sophisticated algorithm working behind the scenes. It’s using what Amazon calls “common sense knowledge” to figure out what readers actually mean when they search. When someone types “books for small apartments,” COSMO knows they probably want organization guides, not novels set in tiny homes.

They’re Not Attack Dogs—They’re Picky Curators

Here’s the thing that blew my mind as a tech writer: these aren’t simple keyword-matching bots anymore. They’re analyzing patterns—what people buy after specific searches, what books get purchased together, how readers behave after they click on your listing.

They’re building what’s called a “Knowledge Graph” around your book. Essentially, they’re creating a detailed profile of who your ideal reader is, when they’d want your book, and why they’d choose it over others.

This explains so much. Ever wonder why a book with fewer obvious keywords is outranking you? It’s because COSMO decided that book was a better “semantic fit” for what readers actually needed.

The Metadata Sniffing Operation

Unlike the old search system that just looked for keyword matches, this duo is reading between the lines of your entire listing. They’re analyzing:

• Your cover design and what genre it signals
• The emotional tone of your description 
• How your keywords relate to actual reader behavior
• Whether people who view your book actually buy it
• What other books your readers typically purchase

The crazy part? They’re doing this in real-time, constantly updating their understanding of your book based on new data.

What This Means for Your Books Right Now

Remember how we used to stuff titles with every possible keyword, hoping something would stick? That strategy is not just ineffective now—it’s actively hurting you.

The AI can’t figure out what your book is actually about if your metadata is a confused mess of every popular keyword. It needs clear, consistent signals about who your book serves and what problem it solves for readers.

Example: Instead of “Romance Enemies Lovers Billionaire CEO Small Town Second Chance”

Try: “A second-chance romance perfect for fans of emotional small-town stories”

See the difference? One is keyword soup, the other tells the AI exactly what kind of reader experience you’re delivering.

The Big Shift: Intent Over Keywords

This is the fundamental change every author needs to understand: Amazon’s AI doesn’t care about matching words anymore. It cares about matching intent.

When someone searches for “fast-paced thriller,” the AI isn’t looking for books that mention “fast-paced” the most times. It’s looking for books that readers actually describe as fast-paced, books that keep people turning pages, books with certain plot structures and pacing patterns.

Your job as an author has shifted from keyword optimization to intent optimization. You need to clearly communicate not just what your book is, but what experience it delivers and what kind of reader will love it.

What’s Coming Next

In my next post, I’ll break down exactly how to optimize for this new system—because there are specific strategies that work with AI curation vs. traditional keyword matching.

But here’s your homework for now: Look at your current book descriptions. Are they talking about your book, or are they talking about your reader’s experience? The AI can tell the difference, and it’s making decisions about your visibility based on that distinction.

Have you noticed changes in how your books are being discovered lately? Drop a comment and let me know what you’re seeing in your dashboard.