How Claude Code’s Creator Runs 1000+ Agents: Here's How To Do It Too
Boris Cherny doesn't prompt Claude anymore. Here's his entire setup.
Boris Cherny created Claude Code at Anthropic. A few weeks ago he mentioned (almost in passing) that he hadn’t opened his IDE in a month. Uninstalled it.
What replaced it: loops.
Automated workflows that prompt Claude on a schedule, evaluate the output, act on it, and start over. Five to ten running interactively during the day. A few thousand agents overnight. Managed from his phone.
Every primitive he’s using shipped publicly in the last six months. /loop, Routines, dynamic workflows, /batch, Skills, the ant CLI. None of it is gated to Anthropic engineers. It’s in your Claude Code right now.
On June 8th he posted the five rules that make it all work:
His five rules, with my read on each:
1. Auto mode for permissions: the difference between an agent that runs overnight and one that’s been waiting on a click since 2am.
2. Dynamic workflows: stop writing prompts. Describe the job. Let Claude write the orchestration.
3. /goal or /loop: forces Claude to actually finish. Without this, agents complete 60% and declare victory.
4. Claude Code in the cloud: close your laptop. The work continues. This is what Routines are for.
5. End-to-end self-verification: the one most people skip. If Claude can’t verify its output against a real environment, every overnight run is a gamble. You’re not reading results in the morning. You’re doing damage control.
📚 By the end of this issue you’ll have everything you need to run this yourself, the three-tier architecture, the actual slash command files, working cron expressions, and the patterns that stop your agents from cheating.
In this issue 🔥
1. The Three-Tier Architecture: why most agents feel like toys, and how composing /loop, Routines, and dynamic workflows gets you to thousands of agents running overnight
2. The 7 Loops: full slash command files you paste into your repo today. Run one command and you have a junior engineer watching your PRs around the clock
3. The 8 Overnight Routines: copy-paste cron expressions, the timing trap that silently breaks your schedule, and the one Routine that makes your agent smarter every single week
4. The Three Ways Agents Fail: agentic laziness, homework grading, goal drift. The six patterns that kill each one before they cost you
5. The 800-Agent Workflow: full code. You describe the job, Claude writes the harness, 800 agents run in parallel
6. Skills — Stop Starting From Zero: the knowledge layer that stops every loop and Routine from starting from zero on every run
7. The ant One-Liner: your merged PRs summarized and posted to Slack from a cron job. No framework. No server. Just pipe
8. What to Build First: the two things that make everything else worth running, and the exact order to build them in
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