A researcher opened an npm package.
What he found broke the internet.
On March 31st 2026, Chaofan Shou noticed something nobody was supposed to see inside Anthropic's Claude Code package — the entire original TypeScript source code.
Publicly accessible.
Just sitting there.
That post hit 3.1 million views.
Within hours, someone archived it to GitHub.
1,100+ stars. 1,900+ forks.
Before Anthropic could even respond.
And the truly ironic part?
Buried inside that leaked code was a system called Undercover Mode — literally built by Anthropic to PREVENT internal secrets from leaking.
They built a leak-prevention system.
And leaked it.
✅Save this video, you'll be referencing this story for years.
Want the SOP? DM me.