phase unphased
participant unphased:actor#1 "planner" steps=ask#1
participant unphased:actor#2 "critic" steps=ask#2
participant unphased:actor#3 "executor" steps=ask#3
handoff unphased:actor#1 -> unphased:actor#2
handoff unphased:actor#2 -> unphased:actor#3 types="string"
