Be candid, not the cruel, Sagittarius...You dislike boundaries in your work, and you may lack them in conversation, too. You aren't afraid to speak your mind. You feel things would run a lot more efficiently if everyone did!
You tell the straight scoop to boss and co-worker alike. No one wonders where they stand with you because you tell them - and then wonder why they're miffed!
On the upside, you don't know how to lie. On the downside, you don't know how to lie, or at least sweeten the truth in a diplomatic candy coating.
Candid opinions are valuable. Take a page from Libra's book and take care that truth-telling doesn't sound to co-workers like meanness and you will be just fine.