RPC parameter list

Is there full documentation of all parameters/arguments available in rpc calls?

Ex. Let’s say I have a function called hello.
When I call that function. In the body of the function what arguments are available for me automatically?

I am trying to build an api for my app and want to put it together well but am having a hard time figuring out what’s there and what isn’t. I know I can get user id, but can I also get information about the machine that initiated the call like user agent, url, etc?
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