This will work (if you add more details):

"Have an agent investiate issue X in modules Y and Z. The agent should place a report at ./doc/rework-xyz-overview.md with all locations that need refactoring. Once you have the report, have agents refactor 5 classes each in parallel. Each agent writes a terse report in ./doc/rework-xyz/ When they are all done, have another agent check all the work. When that agent reports everything is okay, perform a final check yourself"

And you can automate all this so that it happens every time. I have an `/implement` command that is basically instructed to launch the agents and then do back and forth between them. Then there's a claude code hook that makes sure that all the agents, including the orchestrator and the agents spawned have respected their cycles - it's basically running `claude` with a prompt that tells it to read the plan file and see if the agents have done what they were expected in this cycle - gets executed automatically on each agent end.