> ## Documentation Index
> Fetch the complete documentation index at: https://learn.workflow.dog/llms.txt
> Use this file to discover all available pages before exploring further.

# Add Labels

> Add existing labels to a Trello card.

**Add Labels** adds one or more labels without changing the card's other
labels.

## Inputs

| Input                   | Type            | Required | Description                                                |
| ----------------------- | --------------- | -------- | ---------------------------------------------------------- |
| **Third-party account** | Trello account  | Yes      | An account with write access to the card.                  |
| **Card ID or URL**      | String          | Yes      | A card ID, short link, or complete card URL.               |
| **Labels**              | List of strings | Yes      | Label IDs, names, or colors. Matching is case-insensitive. |

## Outputs

| Output      | Type   | Description                          |
| ----------- | ------ | ------------------------------------ |
| **Card**    | Object | The card after its labels are added. |
| **Card ID** | String | The updated card's ID.               |

Label IDs take precedence over names, and names take precedence over colors.
Duplicate references are applied only once.

<Note>
  A color or name that matches multiple labels is ambiguous. Use a label ID to
  identify the intended label.
</Note>