api-design

Designs an interface other people will depend on — REST endpoints, RPC methods, library functions, CLI commands, event payloads. Use this whenever the user is adding a public endpoint, designing a library's surface, defining a message contract, or asking how something should be called. Also use before implementing anything other teams or external users will consume, because the cost of changing it later is the whole point. For implementing against an existing interface, use feature-implementation.