<p>An API operation for adding one or more tags (key-value pairs) to a resource.</p> <p>You can use the <code>TagResource</code> operation with a resource that already has tags. If you specify a new tag key for the resource, this tag is appended to the list of tags associated with the resource. If you specify a tag key that is already associated with the resource, the new tag value you specify replaces the previous value for that tag.</p> <p>Although the maximum number of array members is 200, user-tag maximum is 50. The remaining are reserved for Amazon Web Services use.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}