As far as I'm aware, the func host start command currently requires a directory structure in which the function.json files reside in directories that are siblings to the host.json - or the function project root. So, currently a directory structure something like ..

project-root/ host.json function-one/ function.json function-two/ function.json 

I'm familiar with the two config options for specifying script location and entry point, but those two still require that the function host can discover the function.json.

Would it be possible to add a config option to allow the function host to discover functions that are nested deeper than one directory? Perhaps something that might let me structure a directory like ...

project-root/ host.json src/ account/ get-all/ function.json get-single/ function.json create/ function.json client/ get-all/ function.json 

... and so on.

With this, in combination with the already existing options to specify script location, you could pretty much structure a more complex functions app in any way you want. It'd work great with multi-function typescript projects, where the compiled output goes into a lib folder, as well.