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There isn't a comment syntax for snippets. It looks like @ is used in the 'def' snippet for 'module' context for Python. I think it would only make sense if you set up a variable that is filled from an environment variable. Then it causes the value that is auto-entered to wrap, as you'ld want for a docstring. Some of the snippet syntax predates implementation of filling in the values inline, and @ was probably more relevant before that change, a very long time ago now!