Karpathy: CLI Is the Native Language of Agents — How "Legacy" Tech Became the Best Way In

Karpathy says CLIs are exciting precisely because they're "legacy" tech: AI agents can use and combine them natively. Using the new Polymarket CLI, Claude built a terminal dashboard in about 3 minutes. His challenge to anyone shipping a product: Are your docs exportable as markdown? Have you written Skills? Can it be used via CLI or MCP? It's 2026. Build. For. Agents.