san francisco
Joined August 2025
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I'm excited to be speaking about how we use @e2b sandboxes at @getlark! Make sure you swing by the event!
What does building agents look like inside fast-growing YC startups?
Next Tuesday, hear from the founders of Lark, Runtime, Replicas, 21st, and Paper Instruments about how they're building with AI in production.
ALT E2B's Built by Agents event on August 4th on how YC startups are building on the agentic stack.
Nationalize utility companies
Nearly 50,000 people in the Lake Tahoe area have been told that their utility will stop providing power to them, because it's redirecting that power to data centers.
NV Energy, the Nevada utility that has supplied most of Lake Tahoe’s electricity for decades, says that next year it will stop servicing homes in the area, and instead direct that electricity to the growing demand from Nevada data centers.
Northern Nevada is one of the fastest-growing data-center corridors in the country.
fortune.com/2026/05/12/lake-…
Readers added context they thought people might want to know
“This does not mean the power is shutting off,” said Eric Schwarzrock, president of Liberty Utilities in Lake Tahoe. “Energy companies, utilities, [and] large customers change energy supply frequently.”
sfgate.com/renotahoe/arti…
Jack Brown retweeted
E2E tests shouldn’t break every time your UI evolves.
Today, one of Lark’s own E2E tests failed after we shipped a UI change. Lark summarized the failure, identified it as a test issue rather than an app bug, and repaired the test automatically.
The test has been passing consistently since.
AI solving a 60-year-old math problem is impressive. what's more impressive is that most teams can't get their AI to reliably fill out a form. the gap between research demos and production workflows is still enormous.
the test suite that takes 45 minutes to run is the one nobody fixes broken tests in. speed is a feature, and in CI it's the only feature that affects whether engineers actually trust the output.
Jack Brown retweeted
Over 100 QA reports generated since launch.
We’re seeing real issues uncovered across SDKs, APIs, and dashboards—helping teams catch and fix problems before users report them.
Fast, structured, reproducible.
We just shipped QA Reports.
Deploy AI agents to test your product, uncover issues, and get back a structured report with reproducible test cases.
We ran it on the Vercel Sandboxes API. It mapped test areas, executed flows, and surfaced real issues in minutes.
Try it: getlark.ai
Example report (Vercel Sandboxes API): tests.getlark.ai/a/kiwi/qa-r…
Jack Brown retweeted
OpenAI just added support for popular sandbox providers in their Agents SDK — using a “harness separate from compute” model.
At @getlark, we take a different approach: “harness in compute.”
We want agents to behave more like local Claude or Codex — fully embedded, with everything running inside the compute environment.
That’s why we open-sourced runtimeuse.com — an agent-agnostic framework for running long-lived agents in any sandbox.
Works with @e2b, @daytonaio, @vercel, @modal, and more.
Jack Brown retweeted
We just shipped QA Reports.
Deploy AI agents to test your product, uncover issues, and get back a structured report with reproducible test cases.
We ran it on the Vercel Sandboxes API. It mapped test areas, executed flows, and surfaced real issues in minutes.
Try it: getlark.ai
Example report (Vercel Sandboxes API): tests.getlark.ai/a/kiwi/qa-r…
The leaked claude code src has a real comment about optimizing launch timing for "sustained Twitter buzz" while being "gentler on soul-gen load"
We just launched Repairs at Lark.
Ship a UI change. End-to-end tests break. Lark's QA agents automatically fix them.
No more test maintenance bottlenecks. Just turn on auto-repairs and keep shipping.
Try it → getlark.ai
Jack Brown retweeted
fuck this administration
it does not matter your feelings on immigration at all, this is not how our legal system is intended to work
ICE detain mother at airport—traveling with young daughter.
First reported kidnapping at airport since Trump ordered ICE agents to report—refuse to show ID.
"I don't know who you are!" witness yells.
"You could be someone kidnapping her!"
Agent continue to refuse to show ID until bystanders agree they should call police to report a kidnapping.
Incident occurred at the San Francisco International Airport Gate E2 on March 22, 2026, at 10pm. #DemsUnited