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Why Garry Tan’s Claude Code setup has gotten so much love, and hate

Y Combinator’s famed CEO Garry Tan told a SXSW audience that he’s got “cyber psychosis” and is barely sleeping because he’s so excited to be working with AI agents.

“I sleep, like, four hours a night right now,” he told his interviewer, fellow VC Bill Gurley, during an onstage interview Saturday. “I have cyber psychosis, but I think a third of the CEOs that I know have it as well,” he joked about his current AI obsession. (At least, we hope he was joking. AI-induced psychosis can actually be a dangerous condition.)

“Once you try it, you’ll realize: It’s like I was able to re-create my startup that took $10 million in VC capital and 10 people, and I worked on that for two years, and I took anti-narcoleptics — I remember, you know, sort of being on modafinil,” he described, referencing the sleep-preventing drug that’s popular with the startup hustle-culture crowd. (Tan sold his Y Combinator-backed blogging startup Posterous to Twitter back in 2012.)

But now, his psyche is so amped working with AI agents, it’s a natural insomnia.

“I don’t need modafinil with this revolution. Like, I’m up. I slept at 4 a.m. I woke up at 8 a.m.,” he said. “I wanted to sleep more, but I couldn’t because: Let’s see what’s going on with the 10 workers. I’ve got like three different projects going right now.”

He’s so excited about his agents that on March 12, just two days before the interview, he proudly, freely shared his Claude Code (CC) setup on GitHub under an open source license. The setup included six “opinionated” Claude Code skills he developed. Skills are reusable prompts stored in special “skill.md” files that instruct the AI how to behave in specific roles or tasks.

“I’ve been having such an amazing time with Claude Code, I wanted you to be able to have my *exact* skill setup,” he posted on X. He called his Claude Code setup “gstack.”

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Since then he’s added several more skills. The gstack GitHub repository currently lists 13, but it seems like every hour Tan tweets about something new.

In one post, he gave an example of how his setup works. First, he gets Claude’s opinion on whether a startup idea or feature is a good idea using a skill where Claude acts like CEO. He uses another skill to have Claude write the feature as an engineer, and another to review its own work for bugs and security issues as a code reviewer. Other skills cover design, documentation, and so on.

The love for gstack began immediately: His tweet went viral on X and trended on Product Hunt. It’s accumulated nearly 20,000 stars on GitHub with 2,200 “forks,” meaning people who have taken the files to modify for themselves.

But shortly after releasing gstack, Tan posted a tweet that caused a heap of hate, too.

He wrote that a CTO friend told him gstack was “god mode” that instantly found a security flaw in his company’s code and predicted it will be widely used.

To quote just a few of the many hater comments that followed: One founder posted to X: “(1) Garry should be embarrassed for tweeting this. (2) If it’s true, that CTO should be fired immediately.”

Vlogger Mo Bitar did a take on gstack called “AI is making CEOs delusional” in which he pointed out that the project was essentially “a bunch of prompts” in a text file. The vlogger summarized the common complaint: Developers who use Claude Code already have their own versions of this.

Added one person on Product Hunt, “Garry, let’s be clear and honest: if you weren’t the CEO of YC, this wouldn’t be on PH.”

So who’s right? Is gstack a uniquely useful way to work with Claude Code? Or unremarkable? To find out, I asked the experts, including Claude (which, not surprisingly, absolutely loved it). I also queried ChatGPT and Gemini, both of which were surprisingly positive.

Gstack is a group of “reasonably sophisticated prompt workflows, but they’re not ‘magical,’” ChatGPT opined. “The real insight here is that AI coding works best when you simulate an engineering org structure. Not when you just ask: ‘build this feature.’”

Gemini called the setup “sophisticated,” adding that “gstack is essentially a ‘Pro’ configuration. It is less about making coding easier and more about making it correct.”

Claude called gstack “a mature, opinionated system built by someone who actually uses it heavily,” adding, “It’s one of the better examples of Claude Code skill design out there.”

We’ll take that as a thumbs-up from an expert on the topic.

On Monday, Tan explained in another X post, “I took modafinil just to stay awake longer to be able to turn the momentary crystalline structures I had in my brain into lines of code before sleep or human distraction turned it to grains of sand. I love coding but I love coding with AI even more. I speak it listens and we create. I see the structure and it is built. There is no more powerful an experience to me than that.”

Tan did not respond to multiple requests for comment.


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Amazon working on new smartphone with Alexa at its core, report says

Looks like Amazon’s getting back into the smartphone game. More than 11 years after the e-commerce giant pulled the plug on its failed first effort, the Fire Phone, the company is now developing a new smartphone codenamed “Transformer,” Reuters reported, citing anonymous sources.

The device is being developed by the company’s Devices and Services division, and it would feature personalized features that would make it easier to use Amazon’s suite of apps, including Amazon Shopping, Prime Video, and Prime Music, the report said.

The smartphone would also support Alexa, the smart home assistant that Amazon has been investing heavily in, adding AI chops and expanding support to work with most of the company’s devices. AI features are said to be a big focus for the smartphone, which is being seen internally as a way to encourage Amazon customers to use its AI products, Reuters reported.

The smartphone is said to be developed by a relatively new unit within the Devices division called ZeroOne, which is led by J Allard, a former Microsoft executive who helped create the Xbox.

The news comes as Amazon has been going all-in on AI, investing $50 billion into OpenAI recently, and projecting $200 billion in capital expenditures toward its AI, chips, and robotics efforts in 2026.

The company spent more than a year revamping its Alexa assistant with generative AI features, finally launching it this February as Alexa+. The assistant keeps its smart home chops, and can now do most things that other AI chatbots can — like planning an itinerary for a trip, updating a shared calendar, finding and saving recipes to a library, making movie recommendations, helping with homework, exploring a topic, and more.

Amazon declined to comment.

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Cyberattack on vehicle breathalyzer company leaves drivers stranded across the US

A cyberattack on a U.S. vehicle breathalyzer company has left drivers across the United States stranded and unable to start their vehicles.

The company, Intoxalock, says on its website that it is “currently experiencing downtime” after a cyberattack on March 14. Intoxalock sells breathalyzer devices that fit into vehicle ignition switches, and is used by people who are required to provide a negative alcohol breath sample to start their car.

Intoxalock spokesperson Rachael Larson confirmed to TechCrunch that the company had been hit by a cyberattack. Larson said the company took steps to “temporarily pause some of our systems as a precautionary measure.”

These breathalyzer devices need to be calibrated every few months or so, but the cyberattack has left Intoxalock unable to perform these calibrations. The company said customers whose devices require calibration may experience delays starting their vehicles.

Drivers posting on Reddit say that cars are unable to start if they miss a calibration, effectively locking drivers out of their vehicles.

According to local news reports across Maine, drivers are experiencing lockouts and some have been unable to start their vehicles. One auto shop in Middleboro told WCVB 5 in Boston that it has had cars parked in its lot all week due to the cyberattack.

News reports from across the United States show drivers are affected from New York to Minnesota, and drivers have been unable to drive because their vehicle-based breathalyzers cannot be immediately calibrated.

Intoxalock would not say what kind of cyberattack it was experiencing, such as ransomware or if there was a data breach, or whether it had received any communications from the hackers, including any ransom demands. The company’s technology is used in 46 states, its website says, and it claims to provide services to 150,000 drivers every year.

Intoxalock did not provide an estimated timeline for its recovery.

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AI startups are eating the venture industry and the returns, so far, are good

Well, the data is out. AI startups accounted for 41% of the $128 billion in venture dollars raised by companies on Carta last year — a record-high annual share. In a sense, though, we knew that. Investors last year were voracious in deploying capital to AI startups, to the point that 10% of startups accounted for half of the funding. 

Those startups included Anthropic, OpenAI, and xAI, which raised double-digit billions last year at sky-high valuations. Actually, they are still raising at an even more astounding velocity. In January, xAI raised a $20 billion Series E. In February, OpenAI snagged a $110 billon round, one of the largest private rounds ever raised, bringing the company closer than ever to a $1 trillion valuation. 

Size-wise, in between OpenAI and xAI was Anthropic, which raised a $30 billion Series G last month at a $380 billion valuation. OpenAI and Anthropic accounted for a heavy chunk of the $189 billion in global venture capital raised last month and, alongside xAI, have teased IPOs for later this year that have left investors foaming at the mouth. 

The state of the venture market is now K-shaped — or bifurcated — in which capital remains concentrated in a select few firms that then back a handful of companies, while everyone else is, well, kinda just there. 

“While funding rounds have gotten slightly harder to raise, the capital for each round has increased,” Peter Walker, head of insights at Carta, told TechCrunch. “So fewer bets, but more capital. AI startups are raising bigger rounds not because they have lots of employees — they don’t — but because the cost of running AI models is high.” 

The latest Carta data also shows that funds raised in 2023 and 2024 (after the launch of ChatGPT in late 2022) have posted the highest internal rate of return (IRR), compared with the declining IRR of funds raised between 2017 and 2020. The report views the increased IRR over the past few years as a positive indicator for the funds backing some of the leading startups emerging from this AI moment. 

“It’s promising that the younger funds have seen IRR start strong,” Walker said, adding, however, that there were a few factors to consider. For one, he said, newer funds might look like they are doing well on paper because if they invested in a seed round, for example, and that company went on to raise a Series A at a higher valuation, then on paper it looks like the investor made high returns in a short time period. 

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“This pushes IRR up,” Walker said. “It is also likely that the portfolios of the more recent vintage funds are full of AI-native startups in a way that the portfolios of 2021/2020 funds are not.” 

Time will tell if this early enthusiasm will translate into real returns for investors via exits like blockbuster IPOs or big-dollar acquisitions, or if we are merely in the hype phase of a bubble that will eventually pop.

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