The syntax of code completion snippets is not defined inside the protocol. I know that there is documentation at https://github.com/Microsoft/vscode/blob/master/src/vs/editor/contrib/snippet/browser/snippet.md
However, as this syntax is not versioned along with the protocol, the syntax is effectively undefined. I ran accross the case where the syntax documentation has changed while I'm trying to implement it.
Can we please move snippet definition inside the protocol?