We have released new features for tags in the GraphQL Content API that will help you query assets and entries across content types that share a common tag.

• The ContentfulMetadata type has been added and is accessible from the Asset type as well as from all types using the Entry interface. It can be used to select public tags associated with an entity. Read all about the new type here in our Developer docs.
• You can now query a root entryCollection field with which you can fetch entries across content types. Read more about it here in our Developer docs.
• You can also query content (entries or assets) by specific tags using the new contentfulMetadata field available in the collection filters. See all available filter fields here in our Developer docs.

For apps, we have exposed tag methods in the App SDK and made the resource accessible for backend apps. This allows you to build and customize your own workflows when using tags.

You can read more about the GraphQL API or Apps in our developer docs.