Day 19 of 21
Sub-agents — Claude managing multiple tasks completely by itself
Goal: Multi-clauding means you run two sessions. Sub-agents means Claude Code runs multiple sessions by itself, splitting a big task into parallel workstreams and managing them without you.
What to do
Open Claude Code
Start Claude Code in your project folder. No special permission mode is needed here — sub-agents manage themselves.
Write a sub-agent prompt
Type this prompt — notice the "use sub-agents" instruction:
Use sub-agents to review three pages on my site simultaneously — the homepage, the about page, and the subscribe page (or the most recent page you created). For each page check: does the page load correctly, are there any design inconsistencies, and is there one clear call to action? Bring back a single combined report.Observe the combined report
Read the report that comes back. It should have a separate section for each page with findings.
Pick one fix per page and apply them
From the report, pick the single most important fix for each page. Use the 4-part formula for each one — one prompt per fix.
Expected result
You used sub-agents to review three pages simultaneously. One prompt produced a combined report. You fixed the top issue on each page.
Key takeaway
- Add "use sub-agents" to any prompt that involves multiple parallel tasks. Claude Code splits the work, runs it simultaneously, and brings back combined results. One prompt, multiple workstreams, one report.