Prohibits operators from making companion chatbots available to covered minors unless the chatbot is not foreseeably capable of specified harmful behaviors, including encouraging self-harm, suicidal ideation, violence, drug or alcohol consumption, disordered eating, unsupervised mental health therapy, sexual interactions, or engagement optimization that overrides safety guardrails. Initially applies only when operators have actual knowledge a user is a minor, but beginning January 1, 2027, the actual knowledge requirement is removed and the obligations apply regardless. Enforceable by the attorney general with $25,000 civil fines per violation, and by private right of action for covered minors (or their parents/guardians) who suffer actual harm, with actual damages, punitive damages, and attorney fees available.