431da946_ToolConfigSyntax___Galaxy_Wiki__required
[attribute] id [values] a string * [details] Must be unique across all tools; should be lowercase and contain only letters, numbers, and underscores. It allows for tool versioning and metrics of the number of times a tool is used, among other things. [example] id="sort1" [required] 
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Admin/Tools/ToolConfigSyntax - Galaxy Wiki
required