So did Lynn agree to work with Tobias (and be a spy)? It seems so, but they never said it outright.
I can’t remember which episode—I think it was a couple back, maybe—Jefferson and Lynn were having a conversation, apologizing to each other, and he said something along the lines of “I think you should do it, because Tobias is always a step ahead of us, and this way, we could know what he is planning, etc.”
S04.E06: The Book of Ruin: Chapter Two: Theseus's Ship
in Black Lightning
I can’t remember which episode—I think it was a couple back, maybe—Jefferson and Lynn were having a conversation, apologizing to each other, and he said something along the lines of “I think you should do it, because Tobias is always a step ahead of us, and this way, we could know what he is planning, etc.”