The Karpathy Loop

March 8, 2026: Andrej Karpathy dropped a 630-line Python script, aimed an AI agent at his own training code with a single metric to chase, and went to bed. Two days later the agent had run 700 experiments, found 20 genuine improvements, and cut training time by 11%. It also found a bug in Karpathy’s attention implementation that he had missed — not because the agent is smarter, but because it tried more things faster without getting bored after the 15th failed attempt. ...

April 22, 2026 · Mario Martinez Jr.
Job application portal form with a suspicious line of text visible inside the resume input field.

193 Applications Taught Me That HR AI Agents Are an Unmonitored Attack Surface

I have submitted 193 job applications since January. 193 is a dataset. Confirmation emails arrive within seconds, denial letters on a schedule that matches no known business hours. The support chat deflection timing tells you which platform the company bought. After enough of them, you stop reading the message and start reading the system. HR AI agents are an injection surface that most organizations are not monitoring because they were not bought as security infrastructure. ...

April 13, 2026 · Mario Martinez Jr.