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Systems and developer-tools engineer at Cloudflare as of 2026, on durable infrastructure for AI agents; worked on React and PartyKit before that. Writes at sunilpai.dev.

• It’s been 2 hours and I can already tell this is going to be my most popular post. See the replies. And I’m getting so many DMs from people who went through the same, I’m glad it’s connecting. 2 quick things - - please consider the solution!! it’s counterintuitive and no one considers it but it’s super effective - I hope managers see this too and use it as a tool to help their reports
  Quoting@threepointonenew post: the senior engineer death spiral https://t.co/xzgU1jVBRh a friend just started a big job and asked for some advice. so I braindumped a monologue about a super common failure mode I see with engineers and posted it here, hope it helps whoever it can.

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Writes The Pragmatic Engineer, the software-engineering newsletter, and wrote The Software Engineer's Guidebook. Formerly an engineering manager at Uber, and at Microsoft/Skype and Skyscanner before that.

• So many people in the replies saying it's overcomplicated, and no proof that this works And then plenty other folks saying that at their startup/company they built this the below pretty much, and then a few new things Different speedlanes when it comes to agents + pipelines
  Quoting@GergelyOroszHere's what OpenAI's agentic software factory looks like, today. Details: https://t.co/UUZufLxG2r (thanks to all the OpenAI folks who explained how it works! And Perf Factory looks especially interesting to me)

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• today an engineer found a bug where we over-billed some event types, and made a fix Modem pinged him - a customer flagged this 2 weeks ago, but it got lost in the noise he had no idea! so he followed-up & let them know it was addressed 5 mins of setup → never miss a follow-up

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Writes Hyperdimensional, a newsletter on AI policy and governance. A White House AI policy adviser in 2025; joined OpenAI on 6 July 2026 to lead its Strategic Futures team.

• op deleted his tweet (thanks I guess) but I get a ton of questions about why I sometimes limit replies, and if you’d like to know the answer you can look below.
  Quoting@deanwball@sponkostonko I limit my replies when it occurs to me to do so to make it slightly harder for people to threaten me and my family with violence, which happens frequently in my life now. It still happens, but at least with replies limited my wife is less likely to see it.

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Deep-learning researcher and Turing Award laureate; founder of the Mila institute.

• Over the past few days, I've taken the time to summarize my thoughts on the recent incidents involving agents’ misaligned behavior. We don't know with certainty what comes next, but we know where these issues originate, and this can help us plan the path forward. Please feel free to ask your questions in the replies, and I’ll try to answer some of them in the coming weeks.

  yoshuabengio.org

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Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.

• RE: https://climatejustice.social/@chu/117242750410634529 I love this toot and all the replies.

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Writer of the newsletter bookbear express, on psychology, relationships, non-attachment and taste; based in San Francisco.

• just realized replies to my substack posts to have been going to spam for, oh, about a year. SORRY IF YOU EMAILED ME 💔💔💔

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Developer and podcaster; created Instapaper and Overcast, co-founded Tumblr, and co-hosts the Accidental Tech Podcast.

• RE: https://infosec.exchange/@clayton/117175171619298911 It's OK. This feature is awesome, and one I use heavily. Every social network needs a few mutes here and there. Nobody inherently deserves anyone’s attention. If someone replies in a way that makes me think, "I'd rather not hear from this person again,” I just mute forever. No aggressive block, no report or feedback, no way for them to know. It's not meant to send a message, get revenge, or influence anyone else — just tailor my feed for me.

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Software engineer and founder of Block Party; previously an engineer at Pinterest and Quora, and a co-founder of the non-profit Project Include and the tech diversity data project Where are the Numbers?

• i'm always so excited to see that there are new replies to my slack threads until i realize it's just claude (sorry claude)

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Writes jvns.ca, turning "hard and scary" topics — networking, debugging, Linux internals — into plain explanations and hand-drawn comics. Publishes Wizard Zines, illustrated programming zines. Software developer based in Montreal.

• how do you think about how SSH public key authentication works (versus passwords) and what about your mental model makes you trust it? please only answer if you _don't_ understand the math of how RSA (or elliptic curves etc) works, I'm interested in exploring what it means to understand the interfaces around public key authentication without actually learning number theory (also obviously do not try to explain the math to me, also don't explain to folks in replies unless specifically asked)

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Designer and engineer; formerly principal research engineer at GitHub Next; writes at wattenberger.com.

• there's something rotten in the air when >90% of the replies to a tweet like this are mean spirited sure, it might not be your thing and it's easy to forget this box doesn't go straight into the void. but can we try to bring more kindness into the world?
  Quoting@WattenbergerI look away for one week and VSCode got cute?!

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Labour politician. Prime Minister of the United Kingdom from July 2024 to June 2026, and MP for Holborn and St Pancras from 2015 until standing down in 2026. Director of Public Prosecutions before entering Parliament.

• With Keir 2-year anniversary special: Replying to your comments one last time

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Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.

• Cloudflare on their vulnerabilty discovery harness • Recon: Read the codebase, return an architecture doc • Hunt: ~50 agents look for bugs concurrently • Validate: Independent agents try to disprove findings • Gapfill: Areas that need a 2nd pass are flagged • Dedup: Findings with the same root cause combined • Trace: Confirms if attacker input reaches the bug • Feedback: If reachable, becomes new hunt tasks • Report: Write report with predefined schema

  blog.cloudflare.com

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Programmer and writer on computer architecture, performance, and software reliability. He has worked on CPU design at Centaur Technology and on software at Google and Microsoft, and writes long-form technical essays at danluu.com.

• Can someone at OpenAI help me with an account issue? I'm doing non-security testing and constantly getting flagged for doing "cybersecurity" work. I did the approval / ID scan on my personal account, but my work account is in an infinite loop and I can't use codex/GPT at work.

  OpenAIRelated

Writes on effective altruism, energy and the arithmetic behind arguments people repeat — including how much electricity a chatbot query actually uses.

• To be clear, I do understand how sound works

  Replying to a criticism of my last post

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Hosts the Lex Fridman Podcast — long, unhurried conversations with scientists, engineers and public figures. Several of the interviews quoted elsewhere on this site are episodes of it.

• It was an honor to hang out with Jensen Huang, CEO of @nvidia, and do a long-form podcast with him. Really fun & fascinating technical deep-dive conversation on & off the mic. One of the most brilliant & thoughtful human beings I've ever met. NVIDIA is the most valuable company in the world by market cap and is the engine powering the AI revolution. Podcast probably out tomorrow (Monday) unless I get stuck in too many interesting conversations while running around in SF ;-) PS: I haven't checked my messages in days. Sorry for slow replies 🙏 Trying to stay deeply focused at in overwhelmingly…

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Mathematician and maker of the 3Blue1Brown YouTube channel, which explains mathematics through animation. Creator of the open-source Manim animation library and founder of the Summer of Math Exposition.

• Welp, somewhat embarrassingly, yesterday this account was briefly compromised and someone posing as me promoted a crypto project supposedly "tokenizing" manim. Thank you to those of you who quickly flagged it as spam and alerted me to the problem. For future reference, it's a safe bet that you'll never see me creating and promoting a meme coin.

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Research scientist at Anthropic; co-creator of the Variational Autoencoder and, with Jimmy Ba, of the Adam optimizer, two of the most widely used tools in deep learning.

• Funny how the replies reveal that many people can't actually shape rotate in their mind
  Quoting@ylecunTo people who claim that "thinking and reasoning require language", here is a problem: Imagine standing at the North Pole of the Earth. Walk in any direction, in a straight line, for 1 km. Now turn 90 degrees to the left. Walk for as long as it takes to pass your starting point. Have you walked: 1.…

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