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@skip and @include directives can be applied to query fields. They allow you to skip or include a field based on the value of the if argument passed to the directive.

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@skip

In the query below, we fetch posts and decide whether to fetch the title for them or not based on the skipTitle GraphQL variable. GraphQL query 
query ($skipTitle: Boolean!) {
  queryPost {
    id
    title @skip(if: $skipTitle)
    text
  }
}
GraphQL variables 
{
  "skipTitle": true
}

​
@include

Similarly, the @include directive can be used to include a field based on the value of the if argument. The query below would only include the authors for a post if includeAuthor GraphQL variable has value true. GraphQL Query 
query ($includeAuthor: Boolean!) {
  queryPost {
    id
    title
    text
    author @include(if: $includeAuthor) {
      id
      name
    }
  }
}
GraphQL variables 
{
  "includeAuthor": false
}