This IEEE Spectrum article explores how the rise of autonomous AI agents, software that can search, make decisions, and carry out tasks for users, is poised to transform the online economy, especially in advertising. What’s changing is who the advertisers need to persuade. Instead of directly targeting people, marketers may soon be trying to win the “attention” of agents acting on people’s behalf.
These agents use tools and APIs to fulfill complex user requests such as booking travel, doing deep research, and ordering products. As people increasingly rely on them, the structure of browsing, searching, and discovery shifts. Traditional search engines and social media platforms earned revenue because humans browsed; advertisers could place ads in the feed, search results, etc. But now those interfaces may bypass human interaction, with agents deciding what content to fetch or which product to suggest.
Key technological enablers include things such as the Model Context Protocol (MCP) from Anthropic, which helps agents interact with external tools and databases. Also under discussion is how agents might choose between multiple services for each subtask, e.g., selecting a hotel provider, a map service, and booking platform, based on user preferences. Providers will compete to be in the shortlist that the agent considers.
Advertising models will need rethinking. Instead of bidding for human eyeballs, companies may pay to have their services included in an agent’s context window, the data and tools the agent works with as it completes tasks. Search Engine Optimization (SEO) may evolve beyond keywords to optimizations for semantic meaning or embedding in agents’ internal representations.
There are open questions: How will agents choose which services to use? How will trust, transparency, and control work? Users may want to constrain their agents to services they trust. And privacy or bias issues may become more complex.
Overall, the article argues we’re moving from a human-centric Web to one where autonomous agents act as intermediaries. This shift changes who gets seen, who gets paid, and what the rules of engagement will be.