Til is very opinionated

Very.

One space only

The number of spaces does count. Not counting indentation, it should always be one.

io.out "Starting"  #  1 space = ok
exec   ls /        #  Why? WHY WOULD YOU DO THAT???

See this post to know more.

No tabs

Do not indent code using “tab”.

No uppercase on NameAtoms

Every name must use snake case. Always. Because nobody wants to know what are the rules to write “has gRPC API URL”. It should be obvious: has_grpc_api_url.