When Y Combinator issued a callout earlier this year for more founders building so-called "agentic" AI — software that can essentially think and perform tasks on its own — entrepreneurs were all ears. Of the 144 companies in YC's spring 2025 batch, 70 build agents, according to the accelerator's startup directory. Many of the spring batch startups showed off their technology at YC's Demo Day on Wednesday. Each batch brings together a few hundred early-stage startups for a three-month sprint of p...