I have a google home speaker, and I can issue commands like what's the time or play some music, but I'd like to be able to define my own responses to certain commands, like
how many appointments do I have today
or
are there any cancellations
I would like the above commands to a run a script where I can either run a web-service, or pull information from my SmartThings hub (that bit is optional) and respond with an appropriate response.
I've done a bit of research, and it seems that IFTTT, can do something similar, but I don't really want to be dependent on a 3rd party app, and if this can be done directly with Google.
I guess I'm looking for something similar to Groovy for SmartThings, where I can write Smart Apps.
The API to develop your own commands is known as Actions on Google. Broadly speaking, Actions will send JSON to a webhook that you control, and you can have it do whatever you wish at that point.