We discuss a significant shift in marketing outsourcing from process-based to outcome-based service delivery, primarily driven by advancements in artificial intelligence agents like Google's A2A and Anthropic's MCP. These AI agents enable automation and coordination across systems, allowing outsourcing agreements to focus on achieving measurable business results rather than specific tasks. This transition is analyzed through the lens of Holmström and Tirole's "Theory of the Firm," emphasizing the roles of incomplete contracts, reputation, and information flows in these evolving inter-firm relationships. The text explores the implications of this shift for the value proposition of outsourcing providers, client expectations, and the operational models of marketing firms. Ultimately, it argues that this AI-fueled outcome-based approach is transforming marketing outsourcing into a more strategic and accountable partnership.