TypeSpec is a new tool for API documentation that provides a declarative syntax to define HTTP, REST, and gRPC-based APIs, offering an alternative to OpenAPI. It simplifies the API design process by allowing developers to model types, schemas, and interfaces, thereby streamlining API creation and maintenance while supporting established standards like OpenAPI and gRPC. TypeSpec stands out for its high-level, type-centric language, enabling reusable models across APIs, which fosters consistency in larger ecosystems. It can generate multiple output formats from a single source, including OpenAPI and JSON Schema, making it a versatile tool for organizations focused on API standardization and automation. While still developing its ecosystem, TypeSpec is heavily utilized by Microsoft and fits well into the design, delivery, and documentation stages of the API lifecycle, promoting API-first design principles. The tool is particularly advantageous for teams managing large API portfolios by facilitating modularization and sharing of definitions, though it remains largely developer-centric.