Best AI Agents for B2B Marketing in 2026: Evaluated by Buying Stage, Not Feature Lists
TLDR * An AI agent isn't a tool with AI features; it's a system that perceives context, decides on actions, and executes them autonomously. Most vendor lists get this wrong. * Evaluate agents on capability (autonomy depth, tool-calling range, context persistence) and operational cost (token economics, observability, guardrails)