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Why Binary Audience Decisions Aren’t Fit For The Agentic Era

The article argues that traditional Boolean audience segments have become a bottleneck in the era of AI‑driven, millisecond‑level ad decisioning. As publishers, measurement firms, and first‑party data sources flood the bid stream with real‑time signals, the combinatorial possibilities outpace any pre‑built segment taxonomy. The proposed solution, User Context Protocol (UCP) or Agentic Audiences, replaces segment IDs with dense vector embeddings that fuse multiple signals at impression time. This vector‑based format enables agents to compute relevance scores instantly, eliminating the binary blind spot and unlocking higher ROI.