Day 12 of 21
Multi-Clauding — run two sessions at the same time and double your speed
Goal: Today you run two Claude Code sessions simultaneously, each building something different, and experience what it feels like to have two AI builders working for you at once.
What to do
Create two branches
Open GitHub Desktop. Create two branches: one called "day-12-session-1" and one called "day-12-session-2". Switch to "day-12-session-1" to start.
Open Terminal window 1 and start Session 1
Open a terminal window. Navigate to your project. Type "claude" and press Shift + Tab once for accept edits. If your account clearly exposes auto mode later and you know you want it, you can try that after this run. Give Claude Code a substantial task:
Build a complete resources page at /resources with three sections — Tools, Guides, and Templates. Each section has a heading and three placeholder cards. Match the existing site design exactly. Do not change any other files.Open Terminal window 2 and start Session 2
Open a SECOND terminal window — keep the first one open and running. How to do it: on Mac, press Command + N to open a new Terminal window (or Command + T for a new tab). On Windows, right-click the Command Prompt icon in the taskbar and click "Command Prompt" or "PowerShell" to open a second one. In the second window, navigate to the same project folder — use the same "cd" command you used in the first terminal. Then type "claude" to start Session 2.
Give Session 2 a different task
In the second terminal window, type:
Write five headline options for my homepage hero section. Each should be under 10 words and speak to a non-technical founder. Warm and encouraging tone.Review both results and merge what you want
Wait for both sessions to finish. Check the resources page in your browser. Pick your favourite headline from Session 2. Merge whichever branch results you want to keep into main.
Expected result
You ran two Claude Code sessions simultaneously. Both produced results. You now build twice as fast as before.
Key takeaway
- Open a second terminal window, start a second Claude Code session, give it a different task. One rule: never edit the same file from two sessions at once. Use separate branches. You go from one builder to two — for free.