Kirmond went over twice in a five-try first half that effectively settled the contest to send his side 30-0 ahead just before the break. London threatened a comeback when they scored 14 unanswered points either side of the interval but Kirmond completed his hat-trick on 66 minutes to ensure his side were able to coast to keep them in touch with the top eight.
"(Danny) Kirmond is in great form. Even though the intensity slipped away from our game for a bit it didn't slip away from his," Agar said. "He's been in great form and I've said it before that he has really responded well to the captaincy."
Peter Fox, Richard Mathers and Paul Sykes all followed Kirmond over the whitewash in the opening period as a procession of home points loomed likely.
The Broncos got on the board just before half-time when Liam Colbon collected an excellent offload from debutant Harry Little before a Kieran Dixon double made it 30-14, but Kirmond steadied the ship for Wakefield and when Frankie Mariano and Kyle Wood also touched down, added to 14 points from the boot of Lee Smith, Agar had little to complain about.
"It's definitely a case of job done. The first-half performance set up the win nicely," he said. "Undoubtedly the intensity dropped out of our game for a 20-minute period in the second half.
"We regained that intensity towards those latter stages and we came on strong late on which was pleasing. There are a couple of guys in there that believe they lost their way a bit during the game which puts a little bit of a dampener on it.
"We set off well in the first half and we made some good inroads. Some of the tries were fairly simple close-range efforts but the build-up was great."
Despite the defeat, London head coach Tony Rea saw the positive from a game in which nine London-born players were selected, and the visitors showed resilience in the second half to fightback briefly.
"You have got to put this game in perspective for the guys that are out there. The first period was difficult because they were trying to find themselves as a team," Rea said. "At the end of the day we started without our first-choice halves, front-rowers and back-rowers. That's a fair bit for a young side to go without, and Wakefield were simple and clever with the way they played."