founder diffusion.io, former co-founder & CTO @StrongDM

Redwood City, CA
"You are here" That's how you read the dot in the logo. We're getting to the steep part now, all of us. It's better if we ride the curve together. Come visit me and the team at our first center, Diffusion Silicon Valley. Diffusion Europe and Diffusion India coming soon. diffusion.io/blog/launch/
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Muse and Copilot will diffuse the Grok Bot Feeling broadly
The motivation behind the new Copilot: intelligence is accelerating fast. Now we need to diffuse it everywhere.
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Because so much of the feeling comes from “give the loop a persistent computer” - getting nostalgic feels
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Agree on full attention utilization, and that what we’re doing retains the qualities of engineering. One uber driver delivered me to an airport, and now two pilots are carrying a few hundred of us across a continent. 737 is a transportation amplifier, but requires a lot more rigor and checklists to use it right.
I think the "difficulty" of software engineering is essentially constant no matter what abstraction level you move to, because human cognition adapts to new tools until it can fully utilize itself. Tools are only affordances, not a magic wand that makes work disappear. Great software engineering was immensely challenging before. It is still immensely challenging now, despite very different workflows.
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Justin McCarthy retweeted
Don't measure the AI transformation on costs, says @BuiltByJustin on AI:AM — costs are in the lamplight, too easy. Revenue and market share are the conversation. And a catch: many customers are full of software already. You can't feed them more. nitter.net/i/broadcasts/1qKVmyRRN…
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congrats on teh launch @rshanreddy
America is banning AI in schools. China is using AI to create geniuses. Introducing Aristotle: The AI tutor that solves America’s broken education system. heyaristotle.com
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intent compression
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Very much true. Fixing this is presumably an imperative, and when it unlocks the RSI vibes will be woah
A funny thing is that LLMs are not particularly good building agentic systems. For the moment, you need human expertise to do it well.
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Justin McCarthy retweeted
Autonomy isn't the ability to act without human supervision. It's the ability to *learn* without human bottlenecks in the process. A system that is fully dependent on human training data and RL environments is only an imprint of human knowledge.
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Justin McCarthy retweeted
Product Management as a function and a career is changing so fast. Even at the biggest companies. I often tell people: The gap between PM 2026 and PM 2025 is greater than PM 2025 to PM 2005
I checked in with my friends at Meta to see how AI is reshaping the PM team. What I found is a story I usually only hear at hot startups: endless meetings, reviews, and docs giving way to PMs coding, less process, and far more opinion than I saw in my four years there. So I asked my good friend @jagjitchawla to discuss on the the Skip podcast. A ton of great insights: ◆ VPs used to spend hours reviewing status. Now an AI agent he wrote reads every code change, email, and doc overnight and hands him a punch list before the team logs on ◆ The products got better too — agents triage tens of thousands of bug reports a day and ship the fixes ◆ AI broke things too — site incidents climbed, so they built safeguard agents to vet changes before they ship ◆ Ideas got cheap, so judgment is the bottleneck ◆ The generalists are back — his strongest PMs are economists and physicists, not ex-engineers ◆ It's all homegrown — no vendor, no mandate, built by the teams themselves, some in a single evening ◆ The rollout was deliberate — Meta canceled a full week of meetings, then named "AI captains" by function ◆ Zero-to-one still starts at the whiteboard ◆ What AI doesn't replace: people fall in love with people, not projects You can replicate most of this with little budget and not much effort. Jagjit and I go deep on the latest episode of The Skip: Write-up on Skip: open.substack.com/pub/theski… piped.video/5y3kx8TTsaI
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Justin McCarthy retweeted
Replying to @Steve_Yegge
OpenAI will have their answer soon enough. The main difference with fable is just that it is more determined to reach a goal. It's just a training tweak. Basically the just made /goal no longer a harness feature.
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re: closing loops - @sdianahu has a really dense & correct explanation - re-watch it every morning until you're loop-pilled piped.video/watch?v=EN7frwQI…
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over the weekend I was asked if I had a control systems background; apparently I can't stop talking about self-stabilization through feedback :)
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Justin McCarthy retweeted
Yes! From every.to/guides/compound-eng… AI assistance doesn’t scale if every line requires human review. You need to trust the AI. Trust doesn’t mean blind faith. It means setting up guardrails such as tests, automatic review, and monitoring, that flag issues so that you don’t have to watch every step. When you feel as if you can’t trust the output, don’t compensate by switching to manually reviewing the code. Add a system that makes that step trustworthy, such as creating a review agent that flags issues.
the thing about loops is that you need to build trust first. a low trust loop is just a waste of tokens. and if you don't apply engineering taste, the slop really compounds. but you can become a quality loop enjoyer too with pstack as a starting point: github.com/cursor/plugins/tr… use these skills to write automations that automatically triage, repro, fix, and verify their own work while you touch grass. use them to prototype new ideas and refactor your code and trust that they'll do things the right way
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Justin McCarthy retweeted
Here’s your monthly reminder that you shouldn’t be prompting coding agents anymore. You should be designing loops that prompt your agents.
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Nathan has dedicated himself to the intersection of AI and writing in many forms (Lex, Thoughtful etc). Another one, for the markdown moment
Introducing Roughdraft! A new open source project designed to make collaboration with agents better. The idea is to bring commenting and suggested changes to markdown (e.g. plan docs) in a nice interface. Free, local, etc. 👉 roughdraft.md 👈
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