> Choosing a strict contract is only sustainable if a single project maintains all tools You're obviously not working in the web space, where literally hundred

> Choosing a strict contract is only sustainable if a single project maintains all tools You're obviously not working in the web space, where literally hundreds of thousands of sites have somehow successfully standardized on interoperating via JSON input/output for their HTTP API endpoints despite using many, many different technology stacks, over the last 10 years or so. It isn't perfect, but it's easy to use and common and the tooling is mature.