If you build agent harnesses, this is important. Should you avoid subagents, or can they be useful? My thoughts as a harness builder: I remember using subagents in Claude Code, and I mostly found them useful for parallelizing research. I didn't trust them for other things like coding. In fact, I think parallelization, monitoring/tracking, and better context management are two of the best arguments for using subagents. But are those reasons enough to justify the cost? It depends. For…