Great project, regarding the stricter type system we are currently working on a stricter JSON Schema version called TypeSchema which basically provides a strong type system following TypeScript. Through this you can use all tools which are currently working with JsonSchema but it is easily possible to generate code or build a binary representation. You can take a look at it here: https://typeschema.org/
https://www.fusio-project.org Fusio an open source API & AI management platform to build and manage APIs and MCP tools.
https://typehub.cloud TypeHub an open platform to design and version API specifications.
https://sdkgen.app SDKgen a tool to generate client SDKs and server stubs supporting multiple languages.