I’m running Blades on rpol (which is play by post) and it does require a bit of adjustment to play smoothly in that format.
First off, players need to understand and be comfortable with a level of engagement that is not just the GM describing things. They need to be interested in the game and willing to add to the story/build in the setting and not just react to what you describe for them.
Two, when playing, it’s very helpful for the GM to give a general position/effect at the end of their descriptions and trust the players to not abuse it. E.g., you might describe the scoundrels entering a rooftop window to jump down to a gantry below, and like with an engagement roll, let them know that they’re at risky/standard in general. The players need to know the game well enough to offer changes and suggestions to that, like - The Fist doesn’t have a lot of Prowl, so he just jumps straight down. Probably a Fortune roll to see how much noise he makes.
Also, have a list of Devil’s Bargains ahead of time and post some general ones in when describing a complication. E.g., there’s a steaming whistling Hull stomping your way. It’s going to take you all apart with its sledgehammer hands. Devil’s Bargains - Burn yourself in the steam its releasing [2 Harm], Break a blade on its steel skin, It’s weight starts to buckle the floor (Clock 1/4). And then let the PCs choose them as they play (or come up with different ones) rather than just have them ask and wait for your response.