It was the Wildcats' first win over a top-eight team this year and, coming on the back of last week's win at Widnes, rekindled memories of last year's surge in the second half of the season which took them all the way to the finals series.
"It would be nice but I still think we've a lot of improving to do," Agar said. "We could have been a bit more ruthless but we've improved in the areas we needed to, especially in defence. To concede two tries is a good effort, so we are making some headway."
Winger Peter Fox and second rower Danny Kirmond scored two tries apiece and full-back Lee Smith kicked five goals from seven attempts, although the man-of-the-match award deservedly went to impressive centre Dean Collis.
"I was really pleased with most of it," Agar added. "I thought we started a little bit slow and we finished a bit scruffy. I think we got a bit excited when daylight began to appear between the teams.
"It was difficult playing into the wind and to come in at half-time with a lead was a good effort. It made it hard to shift the ball about at times.
"We showed some real good subtlety on attack in the second half and Tim Smith came up with some really good plays.
"I thought Dean Collis looked a threat every time he touched the ball. He's been in really good form for us all year."
Wakefield lost prop Justin Poore 13 minutes from the end but hope to have him available for next Friday's Challenge Cup tie at Hull.
"He's rolled his ankle but we're not concerned at this stage," Agar said.
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- Dean Collis