Run Multiple Claude Code Sessions in Parallel

Claude Code isn't a single-threaded tool. You can have four, five, six sessions running at once — each tackling a different task, each completely independent.

The workflow looks like this: open multiple terminal windows (Ghostty, iTerm2, or any tabbed terminal), and start a fresh claude session in each one. Assign each session a distinct job.

Window 1: Planning a new feature
Window 2: Implementing a different completed plan
Window 3: Debugging a production issue
Window 4: Writing tests for something just built

While one session is spinning up a plan or running long tests, you switch to another and make progress there. You're never waiting — you're rotating.

To make this practical, you need a few things:

Bypass permissions so sessions run autonomously without asking you every step of the way. Set "defaultMode": "bypassPermissions" in ~/.claude/settings.json so each window can operate on its own.

Use git worktrees so parallel sessions don't clobber each other on the same files:

git worktree add ../project-feature-auth feature/auth
git worktree add ../project-bugfix bugfix/login

Give each session its own worktree and they stay completely isolated.

Finally, use focused plan files. Each session gets its own plan.md describing what it's working on, so you can check in, read the plan, and understand the state at a glance.

Parallel sessions turn Claude Code from a tool into a team.