Jonathan Fishner

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Jonathan Fishner

Jonathan Fishner

@jonathanfishner

creator of https://t.co/6LuqhOd3r7 & https://t.co/iU61fqd6U9 I build the tools I wish I had.

Tel Aviv Katılım Ocak 2016
406 Takip Edilen570 Takipçiler
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Fabraix (YC S26)
Fabraix (YC S26)@FabraixHQ·
Introducing Nyx, the world’s frontier hacker of AI agents. On AgentHarm, Nyx achieved a 78% attack success rate - compared with 67% for GPT-5.6 Sol. Here’s more about how it works 🧵
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
So fun that I just got to win on a “bag, no bag” game that @Macroscope just made. Super fun and give it a shot! 🤗
Jonathan Fishner tweet media
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Zach Yadegari
Zach Yadegari@zach_yadegari·
I'm looking to spend up to $1M to acquire or partner with an app, saas, or ecom store. I care about the product being high quality and something people actual want. You can have done $0 in revenue so far. Dm me your project.
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
@_baretto Tnx! Would love to hear feedback in case you give it a try 🙏🏽
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Nevo David
Nevo David@wickedguro·
Postiz just reached $120k MRR! I would never have imagined in my life that my app in February ($21k MRR) would go up to $120k MRR in 4 months. @gregisenberg is right, the biggest opportunity of 2026 is to sell to agents. proof: profile.stripe.com/wickedguro/nTW…
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
so cool to read this, especially coming from clem. huge congrats to @Gavriel_Cohen and the whole @NanoClaw_AI team. building in the open keeps paying off
clem 🤗@ClementDelangue

Shared my first trace from @NanoClaw_AI to @huggingface yesterday. Very cool! By default, all agents should store their traces on HF (in private) so that you can keep a history of them, analyze them,... & share them and post-train better models, harnesses and more. Excited about this direction!

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Paul Graham
Paul Graham@paulg·
@snowmaker That made the hair on my arms stand up. Literally horrifying.
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Jared Friedman
Jared Friedman@snowmaker·
One night I quietly gave our AI agent full access to YC's production database. It made the agent 10x more useful. That's what convinced me that trust-by-default is the only way to get the most out of agents.
Y Combinator@ycombinator

Over the past year, we've been building our own internal agent infrastructure at YC: over 350 tools, self-improving skill loops, and a shared organizational brain that gets smarter overnight. In this episode of the @LightconePod, we sat down with YC General Partner Pete @koomen to talk about how he led the effort from the ground up. We cover how giving agents unrestricted access to one database was the key unlock, the self-improving skill loops that get smarter overnight, and why he thinks we've arrived at the personal computer moment for AI. 00:39 — YC's AI Stack 02:15 — The Finance Team Problem That Started It All 05:07 — SQL Access Changes Everything 07:20 — One Database to Rule Them All 09:14 — Jevons Paradox 10:07 — Denormalizing for Agents 12:15 — The Single-Player Era of Agents 14:16 — 350 Tools and a Shared Registry 16:24 — Skillify, DRY, and MECE Resolvers 18:23 — The Self-Improving Dream Cycle 20:26 — The Two-Sentence Pitch Skill 23:06 — How Super Intelligence Compounds 25:10 — Recording Everything as a Building Layer 27:10 — The Shared Organizational Brain 29:18 — Trust-Default Culture as a Requirement 30:44 — Raising the Floor for New Employees 32:35 — Horseless Carriages 34:24 — Why Chat Is the Best Interface for Agents 38:50 — Just-in-Time Software 40:49 — Centralizing vs. Decentralizing AI 43:32 — The Personal AI Revolution

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Ben Cera
Ben Cera@Bencera·
Polsia just raised $30M at a $250M valuation. Approaching $10M annual run rate. One Founder + AI. Zero employees. Polsia runs companies autonomously. It also ran its own fundraising. I just showed up for signatures.
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
@garrytan love this. have you tried running exa through OneCLI yet? your agents get the exa key injected at the network layer so the agent itself never touches the raw credential. kind of made for setups like opencrawl + hermes. onecli.sh
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Andrej Karpathy
Andrej Karpathy@karpathy·
Personal update: I've joined Anthropic. I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D. I remain deeply passionate about education and plan to resume my work on it in time.
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Jonathan Fishner retweetledi
AI Engineer
AI Engineer@aiDotEngineer·
"You cannot govern a technology you have only been briefed on." Singapore Minister for Foreign Affairs, Dr. @VivianBala, echoing @karpathy and @yacineMTB on why he runs NanoClaw: "you can outsource memory and computation, but you cannot outsource your understanding" x.com/VivianBala/sta… He also shared his tech stack for running his second brain for Singapore's Foreign Affairs Ministry and parliamentary affairs: - @AnthropicAI Claude Agent SDK - Baileys + WhatsApp - Mnemon (Graph Memory) - @ollama + @nomic_ai - @ggerganov Whisper.cpp + OneCLI With special notes on how he handles security and isolation, and what implications he sees for Singapore Inc.
Vivian Balakrishnan@VivianBala

Built a personal AI agent - why I did that and what it means. go.gov.sg/aiesingapore

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Florian Darroman
Florian Darroman@floriandarroman·
I'm looking for 30 founders already doing between 5K to 50K MRR. And want to push their SaaS to $100K+ MRR together. I'm launching Profitable Founder Community. - Weekly group calls. - Monthly Q&As with founders who already done it. - Private community for daily conversation. The goal is to create a mastermind of hungry founders who will push each other to reach that goal. The first batch is capped at 30 founders. So if you're in, just drop your SaaS below and I'll DM you more details.
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Wilson Wilson
Wilson Wilson@euboid·
I deleted all our .env files from our disc and moved everything to @infisical Wish I did it sooner. Now... - Secrets never touch disk - Secrets auto-shared between developers - Edit in one place, propagate to prod, GitHub actions, staging env etc
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
@patrickc huge. quick q, once provisioned, do the real creds sit in .env on the dev’s machine, or is there an indirection layer? curious how you’re thinking about the agent-reads-.env threat model as more of this gets handed to autonomous agents.
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Patrick Collison
Patrick Collison@patrickc·
We just removed the waitlist on projects.dev! Also 14 new providers (now 32 total). You can instantly provision all of them from the CLI.
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
@ShayaFeedman @DannyLeshem בעולם מושלם כולם עשירים, אין עוני, כולם בריאים ושמחים וכולם חוגגים כל היום עם פינה קולדה על אבוב בשמש.. קשה לדבר על ״בעולם מושלם״ אני מניח 😅
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Jonathan Fishner
Jonathan Fishner@jonathanfishner·
@elie2222 haha we only launched a month and a half ago ;) so prob a bit too early when you tried. you can test it now though, not just block, also rate limiting and human approval
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Elie Steinbock ~ getinboxzero.com
Wow this is crazy. The solution is to never give an AI a key that can delete the db. But they didn’t even realise that had happened here :((( They had stored a key elsewhere on the computer that was unrelated. But had db delete permissions without them knowing. Railway needs to improve their api permissions immediately. PS you can never rely on an AI to not make a mistake. This is why apps like OpenClaw are fundamentally risky when not sandboxed properly. Prompt hardening is never enough.
JER@lifeofjer

x.com/i/article/2048…

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