{'keyword_id': '980629022311',
'text': '[+foo +bar +baz]',
'match_type': 'BROAD',
'final_urls': [],
'quality_score': 3,
'adgroup_id': '110075945014',
'adgroup_name': 'Foo bar baz'},
In the Ads UI, this keyword is displayed as "+foo +bar +baz"
This only is happening with some individual keywords; most broad match keywords are returned by the API correctly without the brackets.