Why TypeScript Won the AI Application Layer

One Type System from Tool Schema to React/Astro UI

Model training happens in Python, but 95% of production AI engineering is I/O orchestration, streaming UI state, authentication, and typed tool execution.

export interface AgentToolResult<T> {
  toolName: string;
  latencyMs: number;
  data: T;
}

Production Architecture Takeaway

Sharing a single TypeScript definition between your MCP tool output and your frontend component prevents runtime serialization bugs.