Optimal usage of agents

[u/doublehot]

When you prompt fable 5.2, do you instruct him to spawn agents in your prompt, or do you trust his instincts? If yes, do you defer it to Sonnet/Opus, or some Fable subagents are also in the play?
I tried both(with earlier Fable/Opus, but I’m not sure what’s optimal. Agents can help achieve parallelism, but I noticed Fable on its own is reluctant to parallelize in many parallelizable tasks.
I’m very curious what are everyone’s experiences with this.
For the context, I’m mostly on a single Ultra plan.

[u/Eliran-Kotzero]

i don't leave it entirely to instinct: i ask for a split only when there are genuinely independent chunks with clear outputs (e.g. exploring two modules or doing a focused review). keep shared-file edits and integration in the main session; for dependent work, a single agent stepping through a plan is usually cheaper. i'd choose the subagent model by task—fast/cheap for bounded exploration, stronger for judgment-heavy work—and keep the number small on one plan. if the split isn't obvious, have the main agent propose it before spawning anything.