This guide explores how agentic AI is transforming digital media sales by enabling autonomous AI agents to plan, negotiate, execute, and optimize advertising campaigns. It argues that publishers must move beyond traditional programmatic advertising and prepare for an AI-driven ecosystem built on unified first-party data, identity resolution, audience intelligence, and open standards. The report highlights the emergence of agent-to-agent advertising, where buyer and seller AI agents transact directly, creating opportunities for faster deal cycles, higher CPMs, improved audience targeting, and greater operational efficiency. To succeed, publishers need clean, AI-ready data, strong identity infrastructure, and participation in open frameworks such as the Ad Context Protocol (AdCP). While concerns around transparency, fraud, and over-automation remain, the guide concludes that publishers who invest now in agent readiness will be better positioned to compete, attract advertising demand, and thrive as AI reshapes the advertising marketplace.

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