Run Multiple Claude Code Sessions in Parallel on Independent Tasks
Claude Code sessions are independent processes. Nothing stops you from running several at the same time, each tackling a different task in your project.
# Terminal 1
claude -p "fix the failing tests in tests/Feature/Auth"
# Terminal 2
claude -p "add input validation to the UserController endpoints"
# Terminal 3
claude -p "write missing docblocks for all public methods in src/Services/"
Each session reads the codebase independently and makes its own changes. As long as the tasks touch different files, they won't conflict — just like two developers working on separate features.
For the best results, keep the tasks isolated:
# Good — different files, no overlap
Session 1: "refactor the payment module"
Session 2: "add tests for the notification system"
Session 3: "update the API documentation"
# Risky — same files, potential conflicts
Session 1: "refactor UserController"
Session 2: "add validation to UserController"
If two sessions do edit the same file, the second one to save will overwrite the first. Treat it like a merge conflict — review the results and reconcile if needed.
You can also use worktrees for true isolation:
# Each session gets its own copy of the repo
git worktree add ../project-tests feature/fix-tests
git worktree add ../project-docs feature/add-docs
cd ../project-tests && claude -p "fix all failing tests"
cd ../project-docs && claude -p "generate API documentation"
Combine with --max-turns and --output-format json to run batch jobs that report results without supervision.
One Claude Code session is productive. Three running in parallel is a development team.
via Claude Code
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When Claude starts referencing files you've since deleted, remembering old code you've already changed, or getting confused by contradictory instructions from a long session — type /clear to wipe the slate clean. Unlike /compact which preserves context, /clear gives you a true fresh start without restarting the CLI.
Not every task needs deep reasoning. Type /fast to switch Claude Code into fast mode — same model, faster output — for quick edits, simple questions, and routine changes. Toggle it off when you need Claude to think harder on complex problems.
Long sessions eat through your context window as conversation history piles up. Type /compact to summarize the conversation so far and reclaim space — keeping Claude's understanding of what you're working on while freeing up room for more work.