I disagree with the point Machavity makes in his answer. Just because it's never explicitly stated that Palpatine is being duplicitous, that doesn't mean he isn't being duplicitous. The show tends to portray Palpatine's double-agent nature in a subtle manner, showing him undermining the Jedi's efforts without telling you that he's doing so.
For example, at the end of Season 3's "Citadel" arc, Ahsoka and Captain Tarkin return to Coruscant, each carrying one half of the coordinates for a secret hyperspace lane that could turn the tide of the war. Ahsoka intends to tell the Jedi Council the coordinates, but she and Tarkin are told to deliver them to Palpatine instead. While it's never stated, and we never see him do it, the obvious implication is that once Palpatine learns the coordinates, he's then going to turn them over to the Separatists, so that both sides have them.
Similarly, the obvious implication of the Umbaran arc is that Palpatine recalled Anakin in a deliberate attempt to sabotage the invasion, and made up some kind of excuse so that the Jedi Council would agree to it. This was my immediate instinct upon watching the arc, and while it's never confirmed, it's never contradicted either.
