TypeScript's `satisfies` Operator Is The Best Thing To Happen To AI Agent Config

I wasted three hours last month chasing a runtime bug in my AI agent config. The tool definitions looked fine. TypeScript wasn't complaining. Then at 2 AM the agent called a tool that didn't exist. The problem: I was using as const where I should have been using satisfies. Here's what changed everything. The Problem With as const for Agent Config When you define Claude tool schemas, you want two things simultaneously: TypeScript should enforce the shape is correct TypeScript should infer the specific literal values (not just string ) as const gives you (2) but not (1.