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The Add Label action applies an existing Gmail label to a message. Use it to categorize processed mail, route inbox work, or mark a workflow stage.

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Inputs

Label names are matched after trimming whitespace and ignoring capitalization. Supplying an exact Gmail label ID also works.
This action has no output. A successful run means Gmail accepted the label update.

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Example

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Troubleshooting

The action does not create labels. Create the label in Gmail first, then use its visible name or exact ID.