As organizations increasingly integrate AI agents and autonomous workflows, securing APIs for both human and machine users becomes essential, highlighting the importance of minimizing access scope for each API action. Progressive scoping ensures that API requests carry only necessary permissions, improving user experience and security by preventing excessive permissions that could be exploited if tokens are compromised. Ambiguous scope requirements lead to security vulnerabilities and poor Agent Experience (AX), as AI agents struggle with unclear permissions and error handling. A preferred solution involves defining scopes in machine-readable OpenAPI specifications, allowing AI agents and tools to intelligently request only necessary permissions. This approach, combined with effective token management systems like Descope, enhances security, reduces consent prompts, and improves AX by allowing seamless agent operation without user intervention. By embedding scope definitions into OpenAPI specs and employing systems like Descope for token management, organizations can create a secure, scalable API infrastructure that supports efficient and safe AI agent interactions, preparing for future AI advancements.