Multi-agent coding starts with task boundaries.

Parallel work is useful when tasks can progress independently and their outputs have clear boundaries. Research, documentation, isolated tests, and changes to separate modules may be easier to coordinate than several agents editing the same central file.

If one task depends on another decision, keep the dependency explicit and sequence it. Starting every agent at once can create rework instead of speed.

Write one shared brief, then make each assignment small enough to review. State what files an agent owns, what it must leave untouched, what evidence it should return, and who will integrate its work.

Every extra agent adds context to review. More sessions do not mean more independent capacity when they edit the same files, depend on a shared decision, or produce work one person cannot inspect.

ProofStack's Swarm gives a five-agent squad one brief with named roles, task assignments, and a live feed for messages. You approve a launch and can follow what each agent reports. That visibility helps coordination, but it does not isolate file edits or guarantee a conflict-free merge; set ownership and review changes yourself.