Check out Claude Code Team Orchestration [1].

Set an env var and ask to create a team. If you're running in tmux it will take over the session and spawn multiple agents all coordinated through a "manager" agent. Recommend running it sandboxed with skip-dangerous-permissions otherwise it's endless approvals

Churns through tokens extremely quickly, so be mindful of your plan/budget.

1. https://code.claude.com/docs/en/agent-teams

git checkout four copies of your repo (repo, repo_2, repo_3, repo_4) within each one open claude code Works pretty well! With the $100 subscription I usually don't get limited in a day. A lot of thinking needs to go into giving it the right context (markdown specs in repo works for us)

Obv, work on things that don't affect each other, otherwise you'll be asking them to look across PRs and that's messy.