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Practical AI workflows, prompts, and tools for founders and operators who want to compound an advantage every week

Newsletter · By Ruben Dominguez · English · Paid tier available · Official site

Indexed issues, last 90 days
24
Latest publication
Sep 30, 2026
Audience
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Earliest in this view
Aug 27, 2026

Latest issues

  1. Issue · Sep 30, 2026

    The 9 Bottlenecks Actually Deciding Who Wins in AI (opens the original)

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    The Boring Bottlenecks Running AIWhich camp do you fall into?Some think that artificial general intelligence is a year away. Others think the whole industry is a bubble waiting to pop.But what if none of that matters?The conversation should focus, right now, on where this technology is bottlenecked, where it’s genuinely delivering and where the mone

  2. Issue · Sep 28, 2026

    OpenAI Declared the AGI Era. Then Greg Brockman Moved 25% of Its Production Engineers to Defense (opens the original)

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    OpenAI’s president watched Astra work coherently for 24 hours straight, then reached for the word the industry has argued about for a decade.“We’re now in the AGI era,” Greg Brockman says on The a16z Show.What he describes next reads like an operations memo: a quarter of OpenAI’s production engineers moved onto defense, $1 billion pledged to frontline defenders, a product canceled, and a pen test he ran against his own website.The AGI label will get the headlines, while the decisions underneath

  3. Issue · Sep 27, 2026

    Your AI Agent Might Be Paying $11,000 a Month to Answer Yes or No (opens the original)

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    Here’s a two-minute exercise that usually ruins someone’s weekend.Open your agent’s logs and count two things: the sentences it wrote for a human, and the decisions it made for itself.The second number wins every time. Which worker runs next. Whether a source is relevant. Whether the tool call worked, whether the task is finished, whether to retry or stop. Each of those questions has three or four possible answers, and most stacks still send every one of them through the same frontier model that

  4. Issue · Sep 26, 2026

    Shorter Prompts Are Making Your AI Agents More Expensive (opens the original)

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    Is There a Right Way to Use AI?Almost everyone I know is using it wrong.They treat it like Google. They ask it to change one sentence in a 2,000-word article. A friend of mine picks actual fights with his Claude Cowork. Then they wonder why they’re spending hundreds of dollars a month on tools that were supposed to make life cheaper.<a class="image-link image2 is-viewable-img" href="https://substackcdn.com/image/fetch/$s_!SG3-!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-

  5. Issue · Sep 25, 2026

    Your AI Agents Are Aging (opens the original)

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    The Agent Lifespan ProblemAn agent that has been on the job for three months is not the same agent that was deployed three months ago.It still answers quickly and still sounds certain. Somewhere along the way it has started reaching for a rule meant for a different client, or quietly choosing the cheaper option because someone once mentioned a budget.It doesn’t mean something has failed. There was no bad update and no attacker in the picture</sp

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