Garry Tan Unveils Gstack at SXSW, Faces Sharp Backlash
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- Garry Tan told a SXSW audience he has "cyber psychosis" and sleeps only four hours a night, joking during an onstage interview with Bill Gurley about his obsession with AI coding agents.
- Tan released "gstack" on GitHub on March 12 as open source, initially including six opinionated Claude Code "skills" — prompt files that instruct the AI to act as CEO, engineer, code reviewer, and designer, simulating an engineering org structure.
- The gstack repository has since grown to 13 skills, accumulated nearly 20,000 GitHub stars and 2,200 forks, and Tan's launch tweet went viral on X and trended on Product Hunt.
- Critics pushed back sharply: vlogger Mo Bitar called it "a bunch of prompts" in a text file and titled his takedown "AI is making CEOs delusional," while startup founder Sherveen Mashayekhi said it only got traction because Tan runs YC.
- A CTO friend's claim that gstack was "god mode" that instantly found a security flaw in his company's code sparked calls for the CTO to be fired, with one founder posting that "Garry should be embarrassed for tweeting this."
- ChatGPT, Gemini, and Claude all gave positive reviews when queried, with ChatGPT noting the real insight is that "AI coding works best when you simulate an engineering org structure. Not when you just ask: 'build this feature.'"
Why it matters: The gstack debate crystallizes the hype-versus-skepticism divide around AI coding tools: a high-profile VC CEO generated 20,000 GitHub stars for what critics call a collection of prompt files, yet even ChatGPT's review identified the genuine insight — simulating an engineering org with distinct roles. For the 2,200 developers who forked it, the test is whether that org-simulation structure actually produces better output than ad-hoc prompting, or whether the buzz is really just YC's brand.
