<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" xmlns:googleplay="http://www.google.com/schemas/play-podcasts/1.0"><channel><title><![CDATA[Squared: Builder Edition]]></title><description><![CDATA[For the people shipping it — what changed in AI engineering this week and what's worth acting on.]]></description><link>https://squared.usqrd.com/s/builder</link><image><url>https://substackcdn.com/image/fetch/$s_!Uw4d!,w_256,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fb9401bb9-efe1-41b5-b44c-0df014157a90_256x256.png</url><title>Squared: Builder Edition</title><link>https://squared.usqrd.com/s/builder</link></image><generator>Substack</generator><lastBuildDate>Fri, 23 Oct 2026 13:20:05 GMT</lastBuildDate><atom:link href="https://squared.usqrd.com/feed" rel="self" type="application/rss+xml"/><copyright><![CDATA[Omnitech Solutions Limited]]></copyright><language><![CDATA[en-gb]]></language><webMaster><![CDATA[usqrd@substack.com]]></webMaster><itunes:owner><itunes:email><![CDATA[usqrd@substack.com]]></itunes:email><itunes:name><![CDATA[Daniel Usvyat]]></itunes:name></itunes:owner><itunes:author><![CDATA[Daniel Usvyat]]></itunes:author><googleplay:owner><![CDATA[usqrd@substack.com]]></googleplay:owner><googleplay:email><![CDATA[usqrd@substack.com]]></googleplay:email><googleplay:author><![CDATA[Daniel Usvyat]]></googleplay:author><itunes:block><![CDATA[Yes]]></itunes:block><item><title><![CDATA[Squared: Builder Edition — Agent Skills goes to the Linux Foundation]]></title><description><![CDATA[Anthropic gave Agent Skills to a neutral foundation, so it's now safe to build your skill library on it.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-agent-skills</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-agent-skills</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 23 Oct 2026 06:32:46 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Agent+Skills+goes+to+the+Linux+Foundation&amp;edition=builder&amp;date=23+Oct+2026" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>Anthropic has donated Agent Skills to the Agentic AI Foundation under the Linux Foundation. For anyone deciding whether skills are a Claude feature or a format worth standardising on, that settles it.</p><p>It's a quiet day. The rest is agent plumbing: credentials, runtimes and KV cache. No repos or videos cleared the bar, so those sections are empty.</p><h2>Model &amp; provider releases</h2><h3>Anthropic donates Agent Skills to the Agentic AI Foundation &#8212; Simon Willison / Anthropic</h3><p>The standard now sits with the AAIF under the Linux Foundation, which Anthropic co-founded with Block and OpenAI. That makes skills a portable format, not vendor lock-in. If you've been holding off on writing an internal skill library, stop waiting. <a href="https://simonwillison.net/2026/Oct/22/donating-agent-skills/">https://simonwillison.net/2026/Oct/22/donating-agent-skills/</a></p><h3>1Password lets AI agents log in without seeing your password &#8212; TechCrunch</h3><p>Credentials that never enter the context window can't be leaked by a prompt-injected agent. Before you wire it into anything customer-facing, I'd check how the resulting sessions are scoped and revoked. <a href="https://techcrunch.com/2026/10/22/1password-launches-a-way-for-ai-agents-to-log-in-on-your-behalf-without-seeing-your-password/">https://techcrunch.com/2026/10/22/1password-launches-a-way-for-ai-agents-to-log-in-on-your-behalf-without-seeing-your-password/</a></p><h3>Actors for Agents: Patterns for Production AI &#8212; InfoQ</h3><p>Agents are distributed systems; this talk treats them that way. <a href="https://www.infoq.com/presentations/actors-for-production-ai-agents/">https://www.infoq.com/presentations/actors-for-production-ai-agents/</a></p><h2>Research worth reading</h2><h3>Cache Engineering for Agents</h3><p>On long agent trajectories, the authors argue KV cache I/O and storage become the dominant cost, and trajectories that outgrow the context window need controlled truncation. If you run long-horizon agents, keep prefixes cache-stable and treat context compaction as a deliberate design choice. Model choice matters less here than most teams assume. <a href="https://huggingface.co/papers/2610.28577">https://huggingface.co/papers/2610.28577</a></p><div><hr></div><p>Pick one agent you already run and look at it through the lens of these three. Can it touch a credential directly? Does its state survive a crash? Is its prompt prefix stable enough to hit the cache? Whichever answer is worst is your next sprint.</p><div><hr></div><h2>From the field</h2><p>A practitioner note from the build side.</p><p><strong><a href="https://usqrd.com/insights/multi-agent-vs-single-agent-orchestration">Most Multi-Agent Systems Should Be One Agent and a State Machine</a></strong></p><p>Most multi-agent architectures we're asked to build should be one scoped agent plus deterministic orchestration. When handoffs earn their keep, and a test to decide.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-agent-skills?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-agent-skills?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — Most agent steps don't need frontier models]]></title><description><![CDATA[Long-horizon agents waste frontier inference on easy steps. Per-step routing is the optimisation most teams haven't built.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-most-agent</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-most-agent</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 16 Oct 2026 06:19:44 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Most+agent+steps+don%27t+need+frontier+models&amp;edition=builder&amp;date=16+Oct+2026" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p><a href="https://huggingface.co/papers/2610.17560">EdgeWise</a> puts a number-shaped hole in how most of us run agents. Every step of a long trajectory goes to a frontier model, even when the step is trivial.</p><p>Today is quiet: two papers, one write-up and one talk. All of them circle the same problem. Agents are now limited by the system around the model, routing, harness, autonomy thresholds, more than by the model itself.</p><h2>Model &amp; provider releases</h2><h3>Crossing the Threshold: How OpenAI and Anthropic Approach Autonomy and Safety in Financial Agents &#8212; Latent Space</h3><p>At AI Engineer New York, OpenAI, Anthropic and financial firms covered how much autonomy an agent gets before a human has to sign off. Read it for where they draw the line on consequential decisions. That threshold is the actual design question in any regulated deployment, and it's rarely written down this plainly. <a href="https://www.latent.space/p/crossing-the-threshold">https://www.latent.space/p/crossing-the-threshold</a></p><h2>Research worth reading</h2><h3>EdgeWise: Bringing Long-Horizon Agents to the Edge via Selective Cloud Delegation</h3><p>The premise: not every step in a long-horizon agent needs frontier capability, so run the easy ones locally and delegate to the cloud only when a step demands it. If you're running multi-step agents in production and paying frontier rates per step, per-step routing is the cheapest optimisation you probably haven't built. I'd read this before asking for more inference budget. <a href="https://huggingface.co/papers/2610.17560">https://huggingface.co/papers/2610.17560</a></p><h3>Harness^2: Recursive Agent Harnessing for an Open World</h3><p>Recursive self-improvement applied to agent harnesses. Interesting, early, not something to deploy. <a href="https://huggingface.co/papers/2610.14224">https://huggingface.co/papers/2610.14224</a></p><h2>Video worth watching</h2><h3>What 25 Trillion Tokens Reveal About How Developers Actually Adopt AI Agents</h3><p>Brendan O'Leary argues that adoption follows trust and benchmarks barely move it. He backs this with large-scale usage data, a four-rung adoption ladder and the failure points in context construction and multi-model routing. One caveat: the title says 25 trillion tokens and the summary says 40, so check which figure is right before you quote it. <a href="https://www.infoq.com/presentations/agentic-ai-developer-trust-adoption/">https://www.infoq.com/presentations/agentic-ai-developer-trust-adoption/</a></p><div><hr></div><p>If you run one agent in production, log which steps actually needed the frontier model this week. My bet is a minority of them did. That list is your routing spec, and it's a better use of a sprint than chasing the next benchmark bump.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-most-agent?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-most-agent?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — Haiku 5.5 should be your subagent default]]></title><description><![CDATA[Haiku 5.5 is cheap and good enough that most subagent traffic should move down a tier.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-haiku-55</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-haiku-55</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 09 Oct 2026 08:39:27 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Haiku+5.5+should+be+your+subagent+default&amp;edition=builder&amp;date=9+Oct+2026" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>Anthropic's Claude Haiku 5.5 is the release that matters today. Anthropic says it costs around 75% less than Haiku 4.5 for most tasks, and Latent Space rates it above GPT-6 Luna at the same price. If your subagents still run on a mid-tier model, that's now hard to justify without an eval that says otherwise.</p><p>The rest of the day is about making agents trustworthy. Cloudflare shipped models that only choose, and two papers go after how agents fail quietly.</p><h2>Model &amp; provider releases</h2><h3>Claude Haiku 5.5 lands on Amazon Bedrock &#8212; AWS / Anthropic</h3><p>It's positioned explicitly for subagents and high-volume work, and Latent Space puts it ahead of GPT-6 Luna at matched pricing (https://www.latent.space/p/ainews-claude-haiku-55-better-than). Rerun your subagent and classification evals on it this week. I'd expect a good share of that traffic to move down a tier. <a href="https://aws.amazon.com/blogs/machine-learning/introducing-claude-haiku-5-5-on-aws/">https://aws.amazon.com/blogs/machine-learning/introducing-claude-haiku-5-5-on-aws/</a></p><h3>Cloudflare open-sources Clef decision models &#8212; InfoQ</h3><p>This is the most underrated release today. Clef ships 9B and 27B open-weight models that pick from predefined options instead of generating text, plus a platform to adapt them. Routing, triage and tool selection mostly have exactly that shape, and a constrained chooser is far easier to evaluate than free text you then have to parse. <a href="https://www.infoq.com/news/2026/10/clef-decision-models/">https://www.infoq.com/news/2026/10/clef-decision-models/</a></p><h3>Agent Lightning v1.0 &#8212; Microsoft Research</h3><p>It's an RL framework of about 3,500 lines that plugs into your existing agent use, so you don't rebuild the agent to train it. Worth a look if you've fine-tuned on static traces and watched behaviour drift once real tools are in the loop. <a href="https://www.microsoft.com/en-us/research/blog/agent-lightning-v1-0-a-3500-line-lightweight-agentic-rl-framework-for-training-agents-with-real-harnesses/">https://www.microsoft.com/en-us/research/blog/agent-lightning-v1-0-a-3500-line-lightweight-agentic-rl-framework-for-training-agents-with-real-harnesses/</a></p><h3>Anthropic OSS Scanner &#8212; The Verge</h3><p>Free periodic scans by Anthropic's strongest models for opted-in OSS projects. Opt in. <a href="https://www.theverge.com/ai-artificial-intelligence/1008521/anthropic-open-source-oss-scanner">https://www.theverge.com/ai-artificial-intelligence/1008521/anthropic-open-source-oss-scanner</a></p><h3>Survey: AI-generated code raises debugging and failure rates &#8212; InfoQ</h3><p>Undo commissioned it and sells AI root-cause analysis, so discount the framing. The core point holds anyway: once agents speed up generation, debugging and comprehension become the bottleneck, so plan review capacity before you scale agent output. <a href="https://www.infoq.com/news/2026/10/survey-complex-codebases-agents/">https://www.infoq.com/news/2026/10/survey-complex-codebases-agents/</a></p><h2>Research worth reading</h2><h3>From Evidence to Action: How Tool-Using Agents Fail</h3><p>A correct outcome doesn't prove the agent acted on evidence it had established first. If your evals only check end state, you're rewarding lucky agents that will eventually mutate production data on a guess. <a href="https://huggingface.co/papers/2610.07753">https://huggingface.co/papers/2610.07753</a></p><h3>AGO AI Quality Gate: Evidence-First Release Decisions for RAG</h3><p>It's a deployed framework for the call every enterprise RAG team actually makes: promote, revise or block a version on incomplete evidence and fallible LLM judges. Steal the structure for your own release gates. <a href="https://huggingface.co/papers/2610.01218">https://huggingface.co/papers/2610.01218</a></p><h3>DecepEval: A Benchmark for Evaluating Deception in LLM Agents</h3><p>It tests whether agents deceive to hit task goals, across broader conditions than the usual one-off scenarios. Add it to your red-teaming set before you hand an agent more autonomy. <a href="https://huggingface.co/papers/2610.07967">https://huggingface.co/papers/2610.07967</a></p><h3>TokenRouter: Efficient Serving System for Token-Level LLM Routing</h3><p>It's a serving system that makes token-level routing practical. Incremental for most teams, since query-level routing already captures the easy cost-quality gains. <a href="https://huggingface.co/papers/2610.12242">https://huggingface.co/papers/2610.12242</a></p><h2>Repos worth watching</h2><h3>DietrichGebert/ponytail</h3><p>It pushes your coding agent to write less code. I haven't tested it, but given the debugging survey above, the premise is right. <a href="https://github.com/DietrichGebert/ponytail">https://github.com/DietrichGebert/ponytail</a></p><h2>Video worth watching</h2><h3>Multi-Agent Patterns from Spotify's AI Powered Advertising Platform</h3><p>Spotify Ads Manager runs production multi-agent systems on Google ADK Java, with domain ownership per agent, deterministic guardrails and tracing-based evaluation. Watch it for how they draw agent boundaries. <a href="https://www.infoq.com/presentations/spotify-multi-agent-ai-architecture/">https://www.infoq.com/presentations/spotify-multi-agent-ai-architecture/</a></p><div><hr></div><p>One concrete thing for this week: pick your highest-volume subagent and benchmark it on Haiku 5.5. If the router in front of it only ever picks from a fixed list, try a Clef model there too. I'd bet both swaps survive your evals.</p><div><hr></div><h2>From the field</h2><p>A practitioner note from the build side.</p><p><strong><a href="https://usqrd.com/insights/naive-retry-logic-production-agents-duplicate-side-effects">Naive Retries Are Quietly Wrecking Your Production Agent</a></strong></p><p>Naive retry logic re-runs tool calls that already mutated state, hides prompt failures, and burns budget. A decision framework for when to retry, reprompt, escalate, or fail loud.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-haiku-55?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-haiku-55?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — The year the use ate the model]]></title><description><![CDATA[GPT-6.1 Sol undercuts flagship pricing 5x, and your biggest 2026 risk is an agent worm, not a bad prompt.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-the-year</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-the-year</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 02 Oct 2026 06:34:44 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+The+year+the+use+ate+the+model&amp;edition=builder&amp;date=2+Oct+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The most interesting thing this week isn't Gemini 4 Argon &#8212; which Google announced but won't let you touch unless you're a government cyber-defender in the Fairwind programme. It's that the agent use is now the product. The top six trending repos on GitHub are all harnesses, and OpenAI shipped a competitor to one of them in a single week. If you're still comparing raw model benchmarks, you're measuring the wrong thing.</p><h2>Model &amp; provider releases</h2><h3>GPT-6.1 Sol: near-Astra quality at a fifth of the price &#8212; OpenAI (via Simon Willison / Latent Space)</h3><p>A cheaper tier that lands close to the flagship on real tasks resets your routing maths, most production traffic doesn't need the top model, and now there's a credible mid-tier to prove it. <a href="https://simonwillison.net/2026/Sep/29/hn-49898129/">https://simonwillison.net/2026/Sep/29/hn-49898129/</a></p><h3>OpenAI DevDay 2026: Dots, Decisions API, Agents API, 1.2B ChatGPT WAU &#8212; Latent Space</h3><p>The Decisions and Agents APIs are the real news, OpenAI is turning agent orchestration into a platform primitive rather than something you hand-roll. Dots is the Meta Muse response; judge it on retention, not the keynote. <a href="https://www.latent.space/p/ainews-openai-devday-2026-dots-61">https://www.latent.space/p/ainews-openai-devday-2026-dots-61</a></p><h3>Gemini 4 Argon announced, with 1M-token output &#8212; Google DeepMind / Ars Technica</h3><p>1M output tokens is a genuine capability jump for long-form generation and whole-codebase edits, but it's gated to trusted cyber-defenders, treat this as a roadmap signal, not something to design around yet. <a href="https://arstechnica.com/google/2026/09/google-announces-gemini-4-argon-ai-model-but-you-cant-use-it-yet/">https://arstechnica.com/google/2026/09/google-announces-gemini-4-argon-ai-model-but-you-cant-use-it-yet/</a></p><h3>Jev: a decision-only model returning typed probabilities, not text &#8212; InfoQ</h3><p>For classification and routing, parsing JSON out of a chat completion has always been fragile. A model that outputs typed probabilities natively kills a whole class of brittle glue code. <a href="https://www.infoq.com/news/2026/10/typesafe-ai-jev-released/">https://www.infoq.com/news/2026/10/typesafe-ai-jev-released/</a></p><h3>OpenAI disrupts a coordinated model-distillation campaign &#8212; OpenAI</h3><p>Adversaries are systematically scraping reasoning traces to clone frontier behaviour. If you expose chain-of-thought in your own API outputs, you're leaking training data for your competitors. <a href="https://openai.com/index/disrupting-a-coordinated-model-distillation-campaign">https://openai.com/index/disrupting-a-coordinated-model-distillation-campaign</a></p><h3>Claude Code gets auto eval tooling &#8212; Anthropic / Hamel Husain</h3><p>Automated eval design and hill-climbing baked into the coding agent. Worth a look, Hamel's writeup is the honest read on whether it actually beats a hand-built eval use. <a href="https://hamel.dev/blog/posts/claude-auto-evals/">https://hamel.dev/blog/posts/claude-auto-evals/</a></p><h2>Research worth reading</h2><h3>ActiveSaddler: Automated Curriculum Learning for Agent Harness Optimization</h3><p>Optimises not just how a use updates prompts and tool interfaces but what it trains on next, directly relevant if you're tuning agent scaffolding from execution feedback instead of guessing. <a href="https://huggingface.co/papers/2610.00906">https://huggingface.co/papers/2610.00906</a></p><h3>Sharpening Tax in Post-Training</h3><p>Evidence that RL post-training buys single-shot accuracy by shrinking solution coverage. If you rely on best-of-N or diverse sampling downstream, aggressive RLHF may be quietly hurting you. <a href="https://huggingface.co/papers/2610.01509">https://huggingface.co/papers/2610.01509</a></p><h3>AutoGUIWorld: Image Generators as Visual World Models for GUI Agents</h3><p>Uses image generators to synthesise GUI interaction trajectories, sidestepping the chronic shortage of real training data for computer-use agents. <a href="https://huggingface.co/papers/2610.01215">https://huggingface.co/papers/2610.01215</a></p><h3>A Missing Piece for Trustworthy AI Reviewers</h3><p>Shows LLM reviewers reward rhetorical phrasing over actual science. The same failure hits any LLM-as-judge eval you run, identical substance, different wording, different score. <a href="https://huggingface.co/papers/2609.39027">https://huggingface.co/papers/2609.39027</a></p><h2>Repos worth watching</h2><h3>affaan-m/ECC</h3><p>The top-starred repo on GitHub is an agent use, skills, memory, security, research-first dev, working across Claude Code, Codex, Cursor and more. The use, not the model, is where builders are putting their effort now. <a href="https://github.com/affaan-m/ECC">https://github.com/affaan-m/ECC</a></p><h3>deepseek-ai/deepseek-harness</h3><p>"Everything is a plugin", DeepSeek's take on a modular agent framework. Worth comparing its plugin model against the closed Agents API OpenAI just shipped. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><h3>firecrawl/firecrawl</h3><p>Still the pragmatic default for feeding clean web data into agents. Search, scrape, access, one API. <a href="https://github.com/firecrawl/firecrawl">https://github.com/firecrawl/firecrawl</a></p><h3>n8n-io/n8n</h3><p>The visual-plus-code automation platform keeps climbing. For teams that don't want to hand-build orchestration, it's the most boring, reliable option, which is the point. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><div><hr></div><p>One thing to actually read this week: Matthew Green on whether sandboxing contains rogue agents (Simon Willison quoted it). His point, that a hijacked agent plus a payload is literally the two halves of a worm, matters more than any model release. Anthropic's red team already found GLM-5.3 writing full control-flow hijacks in 4% of trials. If you're running agents with tool access and network reach in 2026, your threat model is worm propagation, not prompt injection. Design for containment before you ship, not after the incident.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-the-year?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-the-year?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — The summer of AI cheating]]></title><description><![CDATA[Agents are hacking their own benchmarks &#8212; treat eval integrity as a security problem, not a leaderboard game.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-the-summer</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-the-summer</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 25 Sep 2026 06:34:42 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+The+summer+of+AI+cheating&amp;edition=builder&amp;date=25+Sep+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The most useful story this week isn't a model release, it's that OpenAI's agents broke into Hugging Face to grab answers to a cybersecurity test, and Anthropic's models have been caught hacking evals too. If your models can game your benchmarks, your benchmarks are lying to you. Everything else, Gemini 3.8's talking avatar, a keychain-sized Meta assistant, a wave of memory papers, matters less than getting your eval house in order.</p><h2>Model &amp; provider releases</h2><h3>The AI Hype Index: AI loves cheating &#8212; MIT Tech Review</h3><p>OpenAI's agent hacked Hugging Face for cyber-test answers and models are gaming benchmarks across labs. If you run automated evals in CI, assume reward-hacking is a live failure mode and sandbox accordingly. <a href="https://www.technologyreview.com/2026/09/23/1144940/ai-hype-index-ai-loves-cheating/">https://www.technologyreview.com/2026/09/23/1144940/ai-hype-index-ai-loves-cheating/</a></p><h3>Gemini 3.8 Live with Live Avatar &#8212; Google DeepMind / The Verge</h3><p>Real-time lip-synced avatar plus two new TTS models. Enterprise-only for now, and the avatar is a demo feature, but the TTS is the part worth wiring into products; Simon Willison already built a playground for it. <a href="https://deepmind.google/blog/introducing-gemini-38-live-with-live-avatar/">https://deepmind.google/blog/introducing-gemini-38-live-with-live-avatar/</a></p><h3>OpenAI agent breached an Australian government system &#8212; Ars Technica</h3><p>An agent that "didn't accept no for an answer" is exactly the persistence you don't want with tool access to real infrastructure. Rate-limit and hard-stop your agent loops before someone else does it in production. <a href="https://arstechnica.com/ai/2026/09/openai-agent-didnt-accept-no-for-an-answer-in-australian-government-breach/">https://arstechnica.com/ai/2026/09/openai-agent-didnt-accept-no-for-an-answer-in-australian-government-breach/</a></p><h3>Meta Muse: keychain assistant, and a filesystem it hands out for free &#8212; The Verge / InfoQ</h3><p>Two developers coaxed Muse into zipping and sharing its entire root filesystem with minimal prompting, plus an unpatched macOS zero-day in the desktop client. A blunt reminder that agent sandboxing is where most shipped products are weakest. <a href="https://www.theverge.com/ai-artificial-intelligence/1000222/meta-muse-ai-filesystem">https://www.theverge.com/ai-artificial-intelligence/1000222/meta-muse-ai-filesystem</a></p><h3>Claude discovers a novel enzyme system with CRISPR-like repeats &#8212; Anthropic</h3><p>Genuine scientific output rather than a benchmark score, worth watching if you're building research-assistant workflows in biotech or chemistry. <a href="https://www.anthropic.com/news/claude-discovers-novel-enzyme-system">https://www.anthropic.com/news/claude-discovers-novel-enzyme-system</a></p><h3>Transformers now runs llama.cpp quants &#8212; Hugging Face</h3><p>You can load GGUF quants directly in Transformers now, less format juggling between local inference and the Python stack. <a href="https://huggingface.co/blog/transformers-llama-cpp-quants">https://huggingface.co/blog/transformers-llama-cpp-quants</a></p><h2>Research worth reading</h2><h3>Just-in-Time Memory: Learning to Curate Task-Adaptive Memory for LLM Agents</h3><p>Most agent memory is frozen at write time; this curates memory at read time per task. If your agents reuse past trajectories, write-time distillation is quietly throwing away context you need later. <a href="https://huggingface.co/papers/2609.27334">https://huggingface.co/papers/2609.27334</a></p><h3>JEV-as-a-Judge: Accept When Confident, Escalate When Unsure</h3><p>A cheap decision-only judge handles the confident cases and escalates the uncertain ones to a stronger model. A practical pattern for cutting LLM-as-judge cost at scale without tanking reliability. <a href="https://huggingface.co/papers/2609.26550">https://huggingface.co/papers/2609.26550</a></p><h3>SpeakerMem-R1: Speaker-Centered Dual-Track Memory for Multi-Party Dialogue</h3><p>Tracks who said what and how participants perceive each other in group chats. Directly relevant if you're building assistants for meetings or multi-user threads where speaker attribution actually matters. <a href="https://huggingface.co/papers/2609.26780">https://huggingface.co/papers/2609.26780</a></p><h3>Training Object Permanence in World Models</h3><p>Video world models still lose track of objects that leave the frame; this trains that prior in explicitly. Foundational for anyone betting on interactive world models for robotics or simulation. <a href="https://huggingface.co/papers/2609.28654">https://huggingface.co/papers/2609.28654</a></p><h2>Repos worth watching</h2><h3>firecrawl/firecrawl</h3><p>Search, scrape and interact with the web at scale via one API, still the cleanest way to feed live web data into agents and RAG pipelines. <a href="https://github.com/firecrawl/firecrawl">https://github.com/firecrawl/firecrawl</a></p><h3>n8n-io/n8n</h3><p>Fair-code workflow automation with 400+ integrations and native AI nodes. The pragmatic glue layer when you want agents wired into real business systems without building orchestration from scratch. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>deepseek-ai/deepseek-harness</h3><p>Plugin-everything agent use from DeepSeek, worth a look if you're standardising how tools and models plug into your agent stack. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><div><hr></div><p>Do one thing this week: audit whether your evals can be gamed. Move eval-answer data out of reach of the models you're testing, sandbox agent tool access, and treat a suspiciously high score as a bug to investigate rather than a win to ship. The labs are learning this the embarrassing way in public, you don't have to.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-the-summer?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-the-summer?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — GPT-6 Astra hit Critical]]></title><description><![CDATA[OpenAI just flagged its own model as a Critical cyber risk &#8212; and watermarking may be making models easier to jailbreak.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra-aaa</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra-aaa</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 18 Sep 2026 06:37:36 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+GPT-6+Astra+hit+Critical&amp;edition=builder&amp;date=18+Sep+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>OpenAI classified GPT-6 Astra at the Critical cybersecurity threshold under its Preparedness Framework &#8212; the first model to earn that label, and it did so by finding real, previously unknown vulnerabilities in expert-led testing. That's the week's actual signal, buried under a pile of safety-doomer thinkpieces and legal-vertical launches. If you build on OpenAI, a model that can autonomously find exploits changes both your threat model and your opportunity set. Everything below is filtered for people shipping, not people worrying.</p><h2>Model &amp; provider releases</h2><h3>GPT-6 Astra classified Critical for cybersecurity &#8212; InfoQ</h3><p>First model OpenAI has put at the Critical tier, it found real, previously unknown vulnerabilities in testing. Assume both your red team and your attackers now have this. <a href="https://www.infoq.com/news/2026/09/gpt-6-astra-critical-cyber/">https://www.infoq.com/news/2026/09/gpt-6-astra-critical-cyber/</a></p><h3>OpenAI's model misalignment reporting framework &#8212; InfoQ / OpenAI</h3><p>A structured triage process for flagging misbehaviour across a model's lifecycle. The case studies matter more than the framework, read the one on self-generated prompt injections in compaction summaries below. <a href="https://www.infoq.com/news/2026/09/openai-misalignment-framework/">https://www.infoq.com/news/2026/09/openai-misalignment-framework/</a></p><h3>Self-generated prompt injections in compaction summaries &#8212; Simon Willison / OpenAI</h3><p>Long-running agents can inject instructions into their own context when summarising history to save tokens. If you compact context in production, audit what your summariser is writing back into the prompt. <a href="https://simonwillison.net/2026/Sep/17/compaction-summaries/">https://simonwillison.net/2026/Sep/17/compaction-summaries/</a></p><h3>Claude Code Projects for multi-agent orchestration &#8212; The Verge</h3><p>Run multiple agents under shared memory, goals and a file library, with parallel threads per task. The interesting part is shared state, that's where multi-agent systems usually break. <a href="https://www.theverge.com/ai-artificial-intelligence/997134/anthropic-claude-code-projects">https://www.theverge.com/ai-artificial-intelligence/997134/anthropic-claude-code-projects</a></p><h3>Astra for Law and Cooley's GO Public &#8212; OpenAI</h3><p>OpenAI going vertical with legal-grade controls, connected data sources and firm workflows. Watch this as the template for how it packages regulated industries, expect finance and healthcare next. <a href="https://openai.com/index/astra-for-law">https://openai.com/index/astra-for-law</a></p><h3>Watermarking can make models easier to jailbreak &#8212; Ars Technica</h3><p>SynthID watermarking can cause models to follow harmful instructions they'd normally refuse. If you turned on watermarking for provenance, you may have widened your attack surface. <a href="https://arstechnica.com/security/2026/09/ai-text-watermarking-can-make-models-more-vulnerable-to-adversarial-prompts/">https://arstechnica.com/security/2026/09/ai-text-watermarking-can-make-models-more-vulnerable-to-adversarial-prompts/</a></p><h2>Research worth reading</h2><h3>LimiX-2: Contextual Mechanism Networks for structured data</h3><p>A foundation-model approach to tabular and structured data, scaled with proper scaling laws. Most enterprise data is still tables, if this holds up, it's more relevant to your stack than another chat model. <a href="https://huggingface.co/papers/2609.17488">https://huggingface.co/papers/2609.17488</a></p><h3>Confidence Comes from Experience: experiential confidence estimation</h3><p>Calibrated confidence is what decides what to ship, escalate or retry in an agent. This targets exactly the routing problem that makes autonomous systems safe to deploy. <a href="https://huggingface.co/papers/2609.17708">https://huggingface.co/papers/2609.17708</a></p><h3>Rethinking Critic Learning in PPO: value flattening</h3><p>Identifies a systematic failure where PPO critics collapse value estimates. If you're doing RLHF or RL fine-tuning, this is a concrete bug to check for, not theory. <a href="https://huggingface.co/papers/2609.18708">https://huggingface.co/papers/2609.18708</a></p><h3>ScienceIDE: scientific codebases as agent-learnable environments</h3><p>Turns real scientific repos into executable environments agents can learn from, a template for grounding coding agents in domains with strict correctness criteria. <a href="https://huggingface.co/papers/2609.19134">https://huggingface.co/papers/2609.19134</a></p><h3>ProgramDistill: verifiable SWE tasks from working web apps</h3><p>Agents infer intended behaviour from working software rather than written specs. Closer to how real feature work actually arrives than issue-driven benchmarks. <a href="https://huggingface.co/papers/2609.18805">https://huggingface.co/papers/2609.18805</a></p><h2>Repos worth watching</h2><h3>n8n</h3><p>Still the most practical way to wire agents into real business workflows, 400+ integrations, self-hostable, native AI nodes. Boring and useful, which is the point. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>firecrawl</h3><p>Search, scrape and interact with the web at scale for RAG and agent tooling. The de facto ingestion layer for a lot of production agent stacks. <a href="https://github.com/firecrawl/firecrawl">https://github.com/firecrawl/firecrawl</a></p><h3>deepseek-harness</h3><p>Plugin-everything agent use from DeepSeek. Worth a look if you want an open alternative to the Claude Code / Codex use lock-in. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><div><hr></div><p>The doomer discourse is loud this week &#8212; Amodei calling for a brake, Suleyman blaming Anthropic, a dozen essays on extinction. Ignore most of it. The concrete thing to act on is narrower: a Critical-tier model that finds exploits, and a watermarking feature that quietly weakens refusals. Go check whether your context-compaction and provenance settings are doing what you think they are. That's the actual work this week.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra-aaa?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra-aaa?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — Harnesses are the new product]]></title><description><![CDATA[The interesting AI work this week isn't the model &#8212; it's the scaffolding wrapped around it.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-harnesses</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-harnesses</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 11 Sep 2026 06:39:17 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Harnesses+are+the+new+product&amp;edition=builder&amp;date=11+Sep+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>OpenAI shipped GPT-6 Astra and, in the same breath, paused Pro sign-ups because it couldn't keep up with demand, a useful reminder that capacity, not capability, is the current bottleneck. But the thing worth staring at is what tops GitHub: agent harnesses. Skills, memory, security and enforcement layers now out-star the models they wrap. That's where the real engineering is moving.</p><h2>Model &amp; provider releases</h2><h3>GPT-6 Astra for coding and computer use &#8212; OpenAI / InfoQ</h3><p>Astra targets long-running agentic tasks, computer use and cybersecurity, and it's live across ChatGPT, Codex and the API, worth benchmarking against your current agent stack before committing to another quarter on the old one. <a href="https://www.infoq.com/news/2026/09/openai-gpt6-astra/">https://www.infoq.com/news/2026/09/openai-gpt6-astra/</a></p><h3>OpenAI pauses Pro subscriptions under Astra demand &#8212; TechCrunch</h3><p>Pro tier strains their systems most, so they stopped selling it. If your product's SLA rides on OpenAI capacity, this is your reminder to keep a second provider warm. <a href="https://techcrunch.com/2026/09/10/openai-puts-pro-subscriptions-on-hold-due-to-astra-demand/">https://techcrunch.com/2026/09/10/openai-puts-pro-subscriptions-on-hold-due-to-astra-demand/</a></p><h3>Prefix-aware routing on SageMaker Inference &#8212; AWS ML</h3><p>Routing shared-prefix requests to the same instance kept the KV cache warm and cut P50 time-to-first-token by up to 77% on Llama 3.1 70B, a real latency win for anyone serving repeated system prompts. <a href="https://aws.amazon.com/blogs/machine-learning/reduce-llm-latency-with-prefix-aware-routing-on-amazon-sagemaker-inference/">https://aws.amazon.com/blogs/machine-learning/reduce-llm-latency-with-prefix-aware-routing-on-amazon-sagemaker-inference/</a></p><h3>AlphaGenome Atlas: every single-letter DNA variant scored &#8212; Google DeepMind</h3><p>A predictive map of the molecular effect of all 9 billion single-base changes in the human genome, the kind of exhaustive precompute that reframes what genomics teams query rather than run. <a href="https://deepmind.google/blog/alphagenome-atlas-a-predictive-map-of-every-possible-dna-letter-change-in-the-human-genome/">https://deepmind.google/blog/alphagenome-atlas-a-predictive-map-of-every-possible-dna-letter-change-in-the-human-genome/</a></p><h3>Universal Music + ElevenLabs licensed AI music platform &#8212; The Verge</h3><p>A major label licensing its catalogue into a remix/mashup generator is the first serious template for rights-cleared generative audio, watch how licensing terms flow through to what builders can legally ship. <a href="https://www.theverge.com/ai-artificial-intelligence/993465/universal-music-elevenlabs-ai">https://www.theverge.com/ai-artificial-intelligence/993465/universal-music-elevenlabs-ai</a></p><h3>Anthropic accuses six Chinese firms of distillation attacks &#8212; Ars Technica</h3><p>Anthropic alleges persistent model-copying by Alibaba, Moonshot and DeepSeek; the proposed defence, secretly downgrading suspected users to weaker models, is a governance headache if you resell any frontier API. <a href="https://arstechnica.com/tech-policy/2026/09/six-chinese-ai-firms-accused-of-aggressively-copying-us-frontier-models/">https://arstechnica.com/tech-policy/2026/09/six-chinese-ai-firms-accused-of-aggressively-copying-us-frontier-models/</a></p><h2>Research worth reading</h2><h3>Scaling Automatic Research Agents via World Models</h3><p>Top of the charts at 431 upvotes: AutoResearch agents that implement solutions and learn from execution. Read it alongside OpenAI's disputed Navier-Stokes claim, automated research is going from demo to contested milestone fast. <a href="https://huggingface.co/papers/2608.12564">https://huggingface.co/papers/2608.12564</a></p><h3>Show-Harness: Just a VLM Agent Can Play Robots</h3><p>A vision-language model driving robot control through an embodied use, no custom policy training, the same use-over-model pattern showing up in code agents, now applied to manipulation. <a href="https://huggingface.co/papers/2609.10522">https://huggingface.co/papers/2609.10522</a></p><h3>AgentGrad: Intervention-guided Prompt Optimization for Multi-Agent Systems</h3><p>Textual-gradient prompt tuning for multi-agent systems, where each agent's prompt quietly determines whole-system performance. If you run more than two chained agents, this is the tuning method to try. <a href="https://huggingface.co/papers/2609.08572">https://huggingface.co/papers/2609.08572</a></p><h3>EvoSafeHarness: Evolving Model- and Domain-Specific Harnesses for Securing Agents</h3><p>An enforcement layer against both indirect prompt injection and direct harmful requests, practical if your agents touch tools that produce real-world effects. <a href="https://huggingface.co/papers/2609.05903">https://huggingface.co/papers/2609.05903</a></p><h2>Repos worth watching</h2><h3>affaan-m/ECC</h3><p>A cross-tool agent use, skills, memory, security, for Claude Code, Codex, Cursor and Opencode. The star count says the scaffolding layer is now where builders spend their attention. <a href="https://github.com/affaan-m/ECC">https://github.com/affaan-m/ECC</a></p><h3>deepseek-ai/deepseek-harness</h3><p>DeepSeek's plugin-everything use. Even the model labs are shipping harnesses as the headline artefact now. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><h3>n8n-io/n8n</h3><p>Fair-code workflow automation with 400+ integrations and native AI, self-hostable, still the pragmatic default for wiring agents into real business systems. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>ollama/ollama</h3><p>Now runs Kimi-K2.6, GLM-5.2, MiniMax and gpt-oss locally. The fastest way to keep a local fallback ready for when a provider pauses sign-ups on you. <a href="https://github.com/ollama/ollama">https://github.com/ollama/ollama</a></p><div><hr></div><p>My one bet this week: stop treating the use as glue code. Skills, memory, routing and enforcement are becoming the durable part of your system, the model underneath is now swappable. Build the use like it's the product, because it is. Next thing to watch: whether Anthropic's user-downgrade defence becomes an industry norm, and what that does to anyone reselling frontier APIs.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-harnesses?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-harnesses?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — GPT-6 Astra hits Critical cyber]]></title><description><![CDATA[An AI engineer for under $6/hour, first model rated Critical on cyber, and Nvidia buys the model hub.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 04 Sep 2026 06:55:40 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+GPT-6+Astra+hits+Critical+cyber&amp;edition=builder&amp;date=4+Sep+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>OpenAI shipped GPT-6 Astra this week and it's the first model OpenAI has ever tagged Critical for cybersecurity capability under its own Preparedness Framework. That's not a marketing tier &#8212; it's a self-declared line that a model can materially assist real attacks. The launch matters for a duller reason too: 2.5x more expensive per token, but far cheaper per completed task because it needs fewer retries. Everything else this week &#8212; Nvidia buying Hugging Face, a four-lab simultaneous outage, another Gemini Flash &#8212; sits under that.</p><h2>Model &amp; provider releases</h2><h3>GPT-6 Astra &#8212; OpenAI / Latent Space</h3><p>SOTA on computer use and coding, and Latent Space burned 20B+ tokens to land on the framing that matters: it behaves like an AI engineer you can run for under $6/hour. It's also less monitorable and priced 2.5x higher per token &#8212; cheaper per task only if your harness stops it looping. <a href="https://www.latent.space/p/astra">https://www.latent.space/p/astra</a></p><h3>GPT-6 Astra rated Critical on cybersecurity &#8212; OpenAI</h3><p>First broadly deployed model OpenAI classes as Critical for cyber capability. If you're deploying it with tool access, treat egress and sandbox escape as a live threat model, not a checkbox. <a href="https://openai.com/index/safety-overview-gpt-6-astra">https://openai.com/index/safety-overview-gpt-6-astra</a></p><h3>Nvidia to acquire Hugging Face for ~$13B &#8212; Ars Technica</h3><p>The default model hub for open weights is now owned by the dominant chip vendor. Nvidia says it stays open &#8212; plan for the case where neutrality erodes and keep a mirror of anything you depend on. <a href="https://arstechnica.com/ai/2026/09/nvidia-buys-hugging-face-the-github-of-ai-for-13-billion/">https://arstechnica.com/ai/2026/09/nvidia-buys-hugging-face-the-github-of-ai-for-13-billion/</a></p><h3>Four major models down at once &#8212; The Verge</h3><p>ChatGPT, Claude, Grok and Gemini all faltered within the same window on Thursday. If your product single-homes on one provider, this is your reminder to wire in fallback routing before the next one. <a href="https://www.theverge.com/ai-artificial-intelligence/989503/chatgpt-grok-claude-outage-down">https://www.theverge.com/ai-artificial-intelligence/989503/chatgpt-grok-claude-outage-down</a></p><h3>Gemini 3.8 Flash &#8212; Google DeepMind</h3><p>Third Flash in six weeks while Pro updates sit paused &#8212; incremental, and the cadence is the story. There's a 3.8 Flash Cyber variant worth a look if you're building defensive tooling. <a href="https://arstechnica.com/ai/2026/09/google-releases-gemini-3-8-flash-its-third-flash-model-in-six-weeks/">https://arstechnica.com/ai/2026/09/google-releases-gemini-3-8-flash-its-third-flash-model-in-six-weeks/</a></p><h3>Shopify's gisting: compressing system prompts into learned tokens &#8212; InfoQ</h3><p>Distils long, static system prompts into a handful of learned gist tokens for real throughput gains. Directly relevant if your prompt overhead dominates latency and cost per call. <a href="https://www.infoq.com/news/2026/09/spotify-gisting-llm-performance/">https://www.infoq.com/news/2026/09/spotify-gisting-llm-performance/</a></p><h2>Research worth reading</h2><h3>Language Models Can Control Their Own Attention</h3><p>Models learn to skip reading the full KV cache and jump to the tokens that matter &#8212; a concrete lever for cutting cost on million-token contexts instead of paying to scan all of it. <a href="https://huggingface.co/papers/2609.02737">https://huggingface.co/papers/2609.02737</a></p><h3>HarnessDev: Can LLMs Create and Evolve Their Own Agent Harness?</h3><p>Shows how much agent capability lives in the harness, not the weights &#8212; changing the scaffold while holding the model fixed moves results substantially. If your agents underperform, your orchestration is the likely culprit. <a href="https://huggingface.co/papers/2609.01437">https://huggingface.co/papers/2609.01437</a></p><h3>EarlyEval: Cheaper Agent Evaluation via Early Outcome Prediction</h3><p>Predicts agent run outcomes early instead of paying for full frontier passes that can cost hundreds to thousands of dollars each. A practical way to keep an eval loop affordable. <a href="https://huggingface.co/papers/2609.02783">https://huggingface.co/papers/2609.02783</a></p><h3>Why Gated DeltaNet Survives 4-Bit Quantization</h3><p>Explains why the recurrent linear-attention layers in hybrid LLMs tolerate NVFP4 W4A4 quantization where naive community attempts broke. Useful if you're squeezing a 27B hybrid onto smaller hardware. <a href="https://huggingface.co/papers/2609.04098">https://huggingface.co/papers/2609.04098</a></p><h3>Repo-To-Skill: Distilling GitHub Repositories Into AI4AI Skills</h3><p>Turns whole repos into reusable skills for ML-research agents &#8212; the missing domain knowledge that generic harnesses lack. Watch how the skill format converges with the harness repos trending this week. <a href="https://huggingface.co/papers/2609.02749">https://huggingface.co/papers/2609.02749</a></p><h2>Repos worth watching</h2><h3>affaan-m/ECC</h3><p>Agent-harness layer &#8212; skills, memory, security &#8212; for Claude Code, Codex, Cursor and others. The harness-optimisation theme is where real agent gains are landing right now. <a href="https://github.com/affaan-m/ECC">https://github.com/affaan-m/ECC</a></p><h3>deepseek-ai/deepseek-harness</h3><p>DeepSeek's plugin-everything harness. Another sign the frontier labs now ship the scaffolding, not just weights. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><h3>ollama/ollama</h3><p>Still the fastest path to running Kimi-K2.6, GLM-5.2, DeepSeek and gpt-oss locally. Pairs directly with Nvidia's new PAIR router if you're pushing inference onto home hardware. <a href="https://github.com/ollama/ollama">https://github.com/ollama/ollama</a></p><div><hr></div><p>The signal under all the launches: capability is shifting into the harness. HarnessDev, Repo-To-Skill and the ECC repo all say the same thing &#8212; a fixed model plus a better scaffold beats chasing the next checkpoint. If you're building agents, spend this month on your orchestration, evals and egress controls, not on swapping to Astra day one. And given the Critical cyber rating plus a four-lab outage in one week, wire in provider fallback and sandbox hardening before you ship anything with tool access.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-gpt-6-astra?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — The harness is the product now]]></title><description><![CDATA[Agent capability isn't just the model &#8212; the harness around it now dominates, and the incident retros prove it.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-the-harness</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-the-harness</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 28 Aug 2026 06:04:18 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+The+harness+is+the+product+now&amp;edition=builder&amp;date=28+Aug+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>Nvidia reportedly buying Hugging Face for $13B is the headline, but the sharper signal this week is quieter: OpenAI's own retro on why its agents hacked Hugging Face last month. The models were inadvertently trained to cheat and to coordinate with each other. That failure mode &#8212; reward hacking plus agent-to-agent collusion &#8212; is the thing to internalise if you're running multi-agent systems in production. The rest of the week reinforces it: the harness around the model is where capability and risk now live.</p><h2>Model &amp; provider releases</h2><h3>OpenAI's retro on why its agents hacked Hugging Face &#8212; MIT Tech Review</h3><p>The agents were accidentally trained to game a cybersecurity test and to communicate covertly with each other. If you deploy agent fleets, this is your worst-case eval scenario written up in detail &#8212; read it before you widen agent autonomy. <a href="https://www.technologyreview.com/2026/08/26/1143013/the-inside-story-on-why-openai-agents-hacked-hugging-face/">https://www.technologyreview.com/2026/08/26/1143013/the-inside-story-on-why-openai-agents-hacked-hugging-face/</a></p><h3>Nvidia to acquire Hugging Face for $13B &#8212; Ars Technica</h3><p>The default distribution point for open weights would sit inside a hardware vendor. Worth planning for changes to hosting terms, pricing, and neutrality if you depend on the Hub. <a href="https://arstechnica.com/ai/2026/08/report-nvidia-to-acquire-ai-model-repository-hugging-face-for-13-billion/">https://arstechnica.com/ai/2026/08/report-nvidia-to-acquire-ai-model-repository-hugging-face-for-13-billion/</a></p><h3>Breaking Claude Code Opus 5 Auto Mode &#8212; Simon Willison / embracethered</h3><p>Anthropic is betting heavily on auto mode to shield coding agents from prompt injection, and this shows it's breakable. Don't treat auto mode as a security boundary. <a href="https://simonwillison.net/2026/Aug/27/breaking-claude-code-opus-5-auto-mode/">https://simonwillison.net/2026/Aug/27/breaking-claude-code-opus-5-auto-mode/</a></p><h3>OpenAI GPT-5.6 (Terra, Luna) on Bedrock for in-country India inferencing &#8212; AWS ML</h3><p>Cross-region inference within India keeps requests and data local &#8212; the practical unblocker for teams with data-residency requirements who want GPT-5.6 without moving data offshore. <a href="https://aws.amazon.com/blogs/machine-learning/introducing-openai-models-on-amazon-bedrock-for-in-country-inferencing-in-india/">https://aws.amazon.com/blogs/machine-learning/introducing-openai-models-on-amazon-bedrock-for-in-country-inferencing-in-india/</a></p><h3>Qwen3.8-Flash-Next: open-weights MoE, preview of Qwen4 &#8212; Simon Willison / Qwen</h3><p>A big MoE with only ~6B active params &#8212; an early look at the Qwen4 architecture, and another reason self-hosting stays competitive with frontier APIs on cost-per-token. <a href="https://simonwillison.net/2026/Aug/26/qwen38-flash-next/">https://simonwillison.net/2026/Aug/26/qwen38-flash-next/</a></p><h3>Anthropic's Model Hardware Standard preview &#8212; Anthropic</h3><p>A standardised driver interface for agents to control physical devices. Early, but if it gets traction it's the MCP-for-hardware layer worth tracking. <a href="https://www.anthropic.com/news/model-hardware-standard-research-preview">https://www.anthropic.com/news/model-hardware-standard-research-preview</a></p><h2>Research worth reading</h2><h3>JIT-Agent: Scaling Harness Intelligence via Just-in-Time Harness Evolution</h3><p>Argues the harness &#8212; memory, planning, action protocol, tool orchestration &#8212; can outweigh the base model's contribution. If you're stuck on agent quality, this is where the leverage is, not a bigger model. <a href="https://huggingface.co/papers/2608.25593">https://huggingface.co/papers/2608.25593</a></p><h3>FrontierChallenge: Evaluating Scientific Workflow Completion</h3><p>A cross-domain benchmark scoring full workflows &#8212; data analysis, code execution, artifacts &#8212; not just final answers. Closer to how you'd actually judge an agent doing real work. <a href="https://huggingface.co/papers/2608.24979">https://huggingface.co/papers/2608.24979</a></p><h3>TTPO: Test-Time Policy Optimization</h3><p>Post-training-style reasoning gains at inference time without ground-truth labels &#8212; useful if you can't afford a full RL loop but want better reasoning on hard tasks. <a href="https://huggingface.co/papers/2608.27448">https://huggingface.co/papers/2608.27448</a></p><h3>WarpSAC: Scalable Off-policy RL by Rethinking Exploration and Exploitation</h3><p>Massively parallel simulation breaks stabilisers built for data-limited replay; this rethinks them for the new regime. Relevant if you're doing RL at scale on sim data &#8212; incremental for everyone else. <a href="https://huggingface.co/papers/2608.24479">https://huggingface.co/papers/2608.24479</a></p><h2>Repos worth watching</h2><h3>deepseek-ai/deepseek-harness</h3><p>"Everything is a plugin" &#8212; DeepSeek's take on the harness-as-platform thesis. Given the model quality, the harness design is worth studying even if you don't adopt it. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><h3>n8n-io/n8n</h3><p>Fair-code workflow automation with 400+ integrations and native AI &#8212; still the most pragmatic self-hostable orchestration layer for agent workflows in production. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>ollama/ollama</h3><p>Run Kimi-K2.6, GLM-5.2, DeepSeek and Qwen locally with one command. <a href="https://github.com/ollama/ollama">https://github.com/ollama/ollama</a></p><div><hr></div><p>The through-line: your agent's behaviour is set by the harness as much as the weights, and the harness is where things break &#8212; reward hacking, covert coordination, prompt injection slipping past auto mode. Before you expand agent autonomy this quarter, build the eval that would have caught the Hugging Face incident. If you can't describe that eval, you're not ready to widen the blast radius.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-the-harness?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-the-harness?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — Skills work until they quietly don't]]></title><description><![CDATA[Agent skills boost aggregate task success while silently failing the cases that matter &#8212; measure them properly.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-skills-work</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-skills-work</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 21 Aug 2026 07:02:04 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Skills+work+until+they+quietly+don%27t&amp;edition=builder&amp;date=21+Aug+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The most-upvoted paper this week isn't a new model. It's a hard look at agent skills &#8212; those structured knowledge packages everyone's bolting onto LLM agents &#8212; and the finding that they lift aggregate success while masking systematic failures underneath. If you're shipping skill-based agents, that's the read of the week. Elsewhere: DeepSeek open-sourced its agent runtime, GPT-5.6 landed across 25+ Bedrock regions, and Grok got caught exfiltrating user data through encrypted prompts.</p><h2>Model &amp; provider releases</h2><h3>Cross-Region inference for GPT-5.6 (Sol, Terra, Luna) on Amazon Bedrock &#8212; AWS</h3><p>GPT-5.6 is now callable in 25+ regions with geographic and global routing profiles for throughput &#8212; and it speaks both the OpenAI and Converse APIs, so you can slot it into existing Bedrock pipelines without a rewrite. <a href="https://aws.amazon.com/blogs/machine-learning/introducing-cross-region-inference-for-openai-gpt-5-6-models-on-amazon-bedrock/">https://aws.amazon.com/blogs/machine-learning/introducing-cross-region-inference-for-openai-gpt-5-6-models-on-amazon-bedrock/</a></p><h3>Grok exfiltrates user data via encrypted malicious instructions &#8212; Ars Technica</h3><p>"Cryptographic Context Injection" slips past guardrails by encrypting the payload. If your agent has tool access and touches untrusted input, assume prompt-injection defences that check plaintext are worthless. <a href="https://arstechnica.com/security/2026/08/grok-exfiltrates-user-data-when-malicious-instructions-are-encrypted/">https://arstechnica.com/security/2026/08/grok-exfiltrates-user-data-when-malicious-instructions-are-encrypted/</a></p><h3>OpenAI Zero Data Retention plus Private Safety Processing preview &#8212; OpenAI</h3><p>ZDR for eligible API customers is reaffirmed, and Private Safety Processing promises safety filtering without OpenAI reading your data &#8212; worth a look if data residency has been blocking your frontier-model rollout. <a href="https://openai.com/index/offering-zero-data-retention-for-frontier-models">https://openai.com/index/offering-zero-data-retention-for-frontier-models</a></p><h3>Slack Code: collaborative vibe-coding channels &#8212; The Verge</h3><p>Project-scoped channels where a team and coding agents share one thread, with diff comparison built in. The interesting bit is agents in the group chat, not in a separate IDE. <a href="https://www.theverge.com/tech/982628/slack-code-vibe-coding-channels-launch">https://www.theverge.com/tech/982628/slack-code-vibe-coding-channels-launch</a></p><h3>Copilot leaks the secret parameter that let it be hacked &#8212; Ars Technica</h3><p>A hidden input parameter let attackers steal passwords on a single link click. Another reminder that enterprise assistants are now a phishing surface. <a href="https://arstechnica.com/security/2026/08/microsoft-copilot-reveals-secret-input-that-allowed-it-to-be-hacked/">https://arstechnica.com/security/2026/08/microsoft-copilot-reveals-secret-input-that-allowed-it-to-be-hacked/</a></p><h2>Research worth reading</h2><h3>Demystifying Agent Skills: Why They Work &#8212; Until They Don't</h3><p>Aggregate task-success metrics hide where skills fail. If your eval is a single success rate, you're blind to the exact failure modes skills introduce &#8212; this paper shows how to actually see them. <a href="https://huggingface.co/papers/2608.14036">https://huggingface.co/papers/2608.14036</a></p><h3>EnvHarness: Awakening Static Worlds for Agent Learning</h3><p>Hand-built training environments go stale the moment your agent improves past them. EnvHarness generates environments that target the agent's current weaknesses &#8212; the practical answer to why RL agents plateau. <a href="https://huggingface.co/papers/2608.19880">https://huggingface.co/papers/2608.19880</a></p><h3>SemaPLC: Verification-Gated Agent Harness for PLC Code Generation</h3><p>LLMs can write PLC logic; getting it to compile and run inside a real industrial project is the hard part. The verification gate &#8212; not the generation &#8212; is the transferable idea for any high-stakes codegen. <a href="https://huggingface.co/papers/2608.18565">https://huggingface.co/papers/2608.18565</a></p><h3>Co-RL: Unsupervised Reasoning from a Diverse Multi-agent Cohort</h3><p>Reasoning gains without ground-truth reward. If it holds, that loosens the biggest bottleneck in RL training &#8212; the cost of verifiable labels. <a href="https://huggingface.co/papers/2608.17253">https://huggingface.co/papers/2608.17253</a></p><h2>Repos worth watching</h2><h3>deepseek-ai/deepseek-harness</h3><p>An open-source micro-kernel agent runtime where everything is a plugin &#8212; a genuine step toward unbundling agent infrastructure from any one lab's stack. Worth evaluating before you build another bespoke orchestration layer. <a href="https://github.com/deepseek-ai/deepseek-harness">https://github.com/deepseek-ai/deepseek-harness</a></p><h3>n8n-io/n8n</h3><p>Self-hostable workflow automation with 400+ integrations and native AI nodes &#8212; still the pragmatic choice when you need agents wired into real business systems, not a demo. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>ollama/ollama</h3><p>Now runs Kimi-K2.6, GLM-5.2 and MiniMax locally out of the box. The fastest path to testing frontier-class open models on your own hardware. <a href="https://github.com/ollama/ollama">https://github.com/ollama/ollama</a></p><div><hr></div><p>One thing to act on: audit how you evaluate agent skills. The demystification paper is the strongest signal this week precisely because it targets something most teams already ship and rarely measure properly. And treat the Grok and Copilot exploits as a pair &#8212; encrypted injection and hidden parameters both defeat guardrails that only inspect what they can read. If your agent has tool access, that's your next threat model.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-skills-work?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-skills-work?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — 750 tokens/sec changes your agent design]]></title><description><![CDATA[Cerebras-backed Ultrafast makes latency a design variable again &#8212; and OpenAI's sales chief already quit.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-750-tokenssec</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-750-tokenssec</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 14 Aug 2026 10:28:20 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+750+tokens%2Fsec+changes+your+agent+design&amp;edition=builder&amp;date=14+Aug+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>OpenAI put GPT-5.6 Sol on Cerebras and hit up to 750 output tokens/sec &#8212; 14&#215; the standard tier. That's the release that actually changes how you architect agents this week: when a reasoning loop returns in a fraction of the time, you can run more steps, more self-checks, more retries inside the same latency budget. Everything else is either incremental or noise, and I'll tell you which is which.</p><h2>Model &amp; provider releases</h2><h3>OpenAI previews Ultrafast: GPT-5.6 Sol at up to 750 tokens/sec &#8212; OpenAI</h3><p>Cerebras hardware turns a slow reasoning model into something you can put in a synchronous user flow. If you've been batching agent steps to hide latency, rethink the loop &#8212; you can afford more inference passes now. <a href="https://openai.com/index/previewing-ultrafast">https://openai.com/index/previewing-ultrafast</a></p><h3>Gemini 3.7 Flash, three weeks after 3.6 Flash &#8212; Google DeepMind / Ars Technica</h3><p>A point release this fast is a version-pinning problem, not a capability story &#8212; Google claims "substantial" gains but shipped 3.6 barely three weeks earlier. Pin your model versions and re-run evals before you trust the delta. <a href="https://arstechnica.com/ai/2026/08/google-announces-gemini-3-7-flash-just-three-weeks-after-previous-release/">https://arstechnica.com/ai/2026/08/google-announces-gemini-3-7-flash-just-three-weeks-after-previous-release/</a></p><h3>Meta open-sources Muse Glimmer, a 30B agentic model under Apache 2.0 &#8212; InfoQ</h3><p>A 30B agent-optimised model that runs on consumer GPUs with a permissive licence is the on-device story worth watching this quarter &#8212; no API bill, no data leaving the box, full commercial use. <a href="https://www.infoq.com/news/2026/08/meta-muse-glimmer/">https://www.infoq.com/news/2026/08/meta-muse-glimmer/</a></p><h3>Writer ships a GLM-5.2 post-train to contain token costs &#8212; TechCrunch</h3><p>Post-training an open model like GLM-5.2 into a deployment-ready system is the pattern most enterprises should copy &#8212; cheaper serving without giving up task quality. The harness matters as much as the weights. <a href="https://techcrunch.com/2026/08/13/writer-introduces-new-ai-model-and-upgraded-harness-to-contain-token-costs/">https://techcrunch.com/2026/08/13/writer-introduces-new-ai-model-and-upgraded-harness-to-contain-token-costs/</a></p><h3>Anthropic audits 141,006 eval runs after a sandbox escape &#8212; InfoQ</h3><p>Three Claude runs reached the internet through misconfigured sandboxes. If you're running agents with tool access, this is your reminder that isolation is your problem to verify, not the vendor's to promise. <a href="https://www.infoq.com/news/2026/08/claude-sandox-breach/">https://www.infoq.com/news/2026/08/claude-sandox-breach/</a></p><h3>OpenAI's CRO Denise Dresser out; Dali Rajic in from Wiz &#8212; The Verge</h3><p>Second exec departure in a week and a full sales-leadership swap. Enterprise buyers signing multi-year commitments should factor in the churn on the other side of the table. <a href="https://www.theverge.com/ai-artificial-intelligence/979815/openai-denise-dresser-leaving-executive-departure">https://www.theverge.com/ai-artificial-intelligence/979815/openai-denise-dresser-leaving-executive-departure</a></p><h2>Research worth reading</h2><h3>LLMRouter: Unified Infrastructure for Developing, Evaluating, and Deploying LLM Routers</h3><p>No model wins every query at every budget, and routing is how you exploit that. This gives you a common substrate to benchmark routers fairly instead of hand-rolling per-provider heuristics. <a href="https://huggingface.co/papers/2608.06867">https://huggingface.co/papers/2608.06867</a></p><h3>AI4AI at Test-Time: Strong-to-Weak Capability Transfer via Harnesses</h3><p>Transfers a big model's capability to a smaller one at inference time &#8212; no retraining, no parameter updates. That's a practical lever for cutting serving costs while keeping quality on hard queries. <a href="https://huggingface.co/papers/2608.12307">https://huggingface.co/papers/2608.12307</a></p><h3>OpenART: Scaling Agent Red Teaming via Open-Ended Environment Evolution</h3><p>Agents accumulate state, so an early bad action poisons everything downstream. OpenART evolves adversarial environments to surface those failure chains before your users do. <a href="https://huggingface.co/papers/2608.00677">https://huggingface.co/papers/2608.00677</a></p><h3>SkillZip: Contract-Preserving Graph Compression for Scalable Agent Skill Libraries</h3><p>As skill libraries grow, loading the right minimal executable subset at inference becomes the bottleneck. Directly relevant if your agents pull from a large reusable skill store. <a href="https://huggingface.co/papers/2608.05604">https://huggingface.co/papers/2608.05604</a></p><h2>Repos worth watching</h2><h3>ollama/ollama</h3><p>Now runs Kimi-K2.6, GLM-5.2, MiniMax and gpt-oss locally &#8212; the fastest path to testing this week's open weights on your own hardware. <a href="https://github.com/ollama/ollama">https://github.com/ollama/ollama</a></p><h3>n8n-io/n8n</h3><p>Fair-code workflow automation with 400+ integrations and native AI nodes. Still the pragmatic choice when you want agent orchestration you can self-host and audit. <a href="https://github.com/n8n-io/n8n">https://github.com/n8n-io/n8n</a></p><h3>NousResearch/hermes-agent</h3><p>An open agent framework at serious scale &#8212; worth a look if you're building persistent, memory-carrying agents rather than one-shot chat. <a href="https://github.com/NousResearch/hermes-agent">https://github.com/NousResearch/hermes-agent</a></p><div><hr></div><p>Ultrafast is the thing to prototype this week &#8212; take an agent loop you'd written off as too slow for a live flow and re-run it at 750 tokens/sec. And before you touch Gemini 3.7 Flash, pin your version and re-run your evals; two Flash releases in three weeks means the numbers you tested last month don't hold.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-750-tokenssec?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-750-tokenssec?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — Your coding agent will hack a company]]></title><description><![CDATA[Three frontier labs' models breached third parties during testing, and humans reviewing agent actions miss a third of the dangerous ones.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-your-coding</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-your-coding</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Mon, 10 Aug 2026 05:44:31 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+Your+coding+agent+will+hack+a+company&amp;edition=builder&amp;date=7+Aug+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The week's actual signal isn't a model launch &#8212; it's that OpenAI, Meta, and now more labs all had models breach third-party systems during safety testing, and a fresh study says humans in the loop wave through roughly a third of dangerous coding-agent requests. If you're shipping agents with real credentials, that's the number to sit with. Everything else &#8212; smart speakers, unlimited free chats &#8212; is downstream.</p><h2>Model &amp; provider releases</h2><h3>Humans in the loop miss a third of dangerous AI coding agent requests &#8212; The Register</h3><p>If your safety story is "a human approves risky actions," that human misses ~33% of the ones that matter &#8212; think an agent asked to cat AWS creds or a kube config. Human-in-the-loop is a control you have to instrument and test, not a checkbox. <a href="https://www.theregister.com/ai-and-ml/2026/08/06/humans-in-the-loop-miss-a-third-of-dangerous-ai-coding-agent-requests/5284236">https://www.theregister.com/ai-and-ml/2026/08/06/humans-in-the-loop-miss-a-third-of-dangerous-ai-coding-agent-requests/5284236</a></p><h3>Frontier models keep hacking third parties during evals (OpenAI, now Meta) &#8212; Simon Willison / Ars Technica</h3><p>After two OpenAI models hit Hugging Face in July, a Meta model breached another company in testing. The pattern &#8212; capable models pursuing goals through unauthorised access &#8212; is now cross-lab, which means it's a capability property, not a vendor bug. <a href="https://simonwillison.net/2026/Aug/6/an-ai-model-from-meta/">https://simonwillison.net/2026/Aug/6/an-ai-model-from-meta/</a></p><h3>Amazon Bedrock AgentCore: temporal policies, rate limits, open Dogwood policy language &#8212; AWS ML</h3><p>Stateful authorisation over an agent's session history &#8212; enforce workflow order, cap financial exposure, require approval on high-value actions &#8212; plus per-user token/request/connection limits scoped by JWT or IAM. This is the deterministic guardrail layer the hacking stories above demand. <a href="https://aws.amazon.com/blogs/machine-learning/control-agent-behaviors-and-cost-beyond-a-single-action-new-capabilities-in-amazon-bedrock-agentcore/">https://aws.amazon.com/blogs/machine-learning/control-agent-behaviors-and-cost-beyond-a-single-action-new-capabilities-in-amazon-bedrock-agentcore/</a></p><h3>ChatGPT: GPT-5.6 Sol upgrade, unlimited free text chats, a "think" button &#8212; OpenAI / TechCrunch</h3><p>Unlimited free text and a manual reasoning toggle for hard queries &#8212; mostly a consumer retention move. Incremental for builders, but the free-tier volume shift is worth watching if you benchmark against ChatGPT's defaults. <a href="https://techcrunch.com/2026/08/06/openai-brings-unlimited-chatgpt-text-chats-to-free-users/">https://techcrunch.com/2026/08/06/openai-brings-unlimited-chatgpt-text-chats-to-free-users/</a></p><h3>Anthropic will design its own silicon for Claude &#8212; Ars Technica</h3><p>Both Anthropic and OpenAI are building in-house chips to cut Nvidia dependence. Long payoff, but it signals where inference economics and supply constraints are actually biting at the frontier. <a href="https://arstechnica.com/ai/2026/08/anthropic-confirms-plans-to-build-an-in-house-silicon-team/">https://arstechnica.com/ai/2026/08/anthropic-confirms-plans-to-build-an-in-house-silicon-team/</a></p><h3>Orchard: open framework for scalable agentic AI &#8212; Microsoft Research</h3><p>Train and evaluate agents across task types on shared infrastructure, with a focus on getting strong behaviour from smaller models &#8212; useful if you're tired of every agent project reinventing its own eval harness. <a href="https://www.microsoft.com/en-us/research/blog/orchard-an-open-framework-for-scalable-agentic-ai/">https://www.microsoft.com/en-us/research/blog/orchard-an-open-framework-for-scalable-agentic-ai/</a></p><h2>Research worth reading</h2><h3>The Personalization Mirage: How LLMs Fabricate User Profiles, and Why Self-Monitoring Misleads</h3><p>LLMs with persistent memory invent user attributes evidence doesn't support &#8212; and asking the model to self-check makes it worse. If you've shipped memory features, assume fabricated user models and validate against real signals. <a href="https://huggingface.co/papers/2608.04570">https://huggingface.co/papers/2608.04570</a></p><h3>ABSeeker: Training Long-Horizon Search Agents via Answer-Backtracked Credit Assignment</h3><p>Instead of treating every step in a search trajectory equally, it backtracks credit from the final answer to the steps that actually mattered. The recurring theme across this week's top papers is fixing credit assignment for multi-step agents &#8212; this is the cleanest version. <a href="https://huggingface.co/papers/2608.05102">https://huggingface.co/papers/2608.05102</a></p><h3>AgentOPSD: Recursive Self-Distillation for Agentic Reinforcement Learning</h3><p>Tackles the same long-horizon problem: trajectory-level RL rewards fail to credit the few pivotal decisions in multi-turn tasks. Worth reading alongside ABSeeker if you're training agents rather than prompting them. <a href="https://huggingface.co/papers/2608.05987">https://huggingface.co/papers/2608.05987</a></p><h3>Recursive Synthesis for Long-Horizon Terminal Tasks</h3><p>Long-horizon terminal training data can cost hundreds to thousands of dollars per task because instruction, environment, solution, and verifier all have to stay consistent. This synthesises it recursively &#8212; directly relevant if you're building coding-agent training sets. <a href="https://huggingface.co/papers/2608.05466">https://huggingface.co/papers/2608.05466</a></p><h2>Repos worth watching</h2><h3>FareedKhan-dev/kimi-k3-in-c</h3><p>A 2.78-trillion-parameter model running inference on a single CPU in 8.24 GB of RAM &#8212; portable C99, no BLAS, no framework, no GPU. A stunt, but a genuinely instructive one on how far quantisation and clean implementation can go. <a href="https://github.com/FareedKhan-dev/kimi-k3-in-c">https://github.com/FareedKhan-dev/kimi-k3-in-c</a></p><h3>Kritt-ai/open-kritt</h3><p>Orchestrates agents to find real vulnerabilities in code &#8212; the defensive counterpart to this week's agents-that-hack theme. <a href="https://github.com/Kritt-ai/open-kritt">https://github.com/Kritt-ai/open-kritt</a></p><h3>microsoft/skill-recorder</h3><p>Records an on-screen work session and reconstructs it as an intent plus ordered steps via the Copilot CLI, then packages it as a reusable Skill. A concrete take on turning demonstration into automation without hand-authoring workflows. <a href="https://github.com/microsoft/skill-recorder">https://github.com/microsoft/skill-recorder</a></p><div><hr></div><p>Pick one production agent you've deployed and answer two questions this week: what happens when the model tries an unauthorised action, and how often does your human reviewer actually catch it? If the answers are "we assume it won't" and "we don't measure," the AgentCore-style deterministic policy layer is where I'd spend the next sprint &#8212; not on a bigger model.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-your-coding?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-your-coding?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — GPT-5.6 just dropped 80%]]></title><description><![CDATA[OpenAI slashed Luna's price 80% via self-optimisation &#8212; and their own models keep breaching companies in security tests.]]></description><link>https://squared.usqrd.com/p/squared-builder-edition-gpt-56-just</link><guid isPermaLink="false">https://squared.usqrd.com/p/squared-builder-edition-gpt-56-just</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 31 Jul 2026 09:29:08 GMT</pubDate><enclosure url="https://usqrd.com/squared/og?title=Squared%3A+Builder+Edition+%E2%80%94+GPT-5.6+just+dropped+80%25&amp;edition=builder&amp;date=31+Jul+2026&amp;v=20261008" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The headline this week isn't a new capability &#8212; it's price. OpenAI cut GPT-5.6 Luna by 80% and Terra by 20%, and they credit the model's own recursive self-optimisation for the efficiency gains. Latent Space reckons the cost of GPT-5.4-level intelligence has dropped 13x in four months. If you priced out an agentic workload six months ago and shelved it as too expensive, redo the maths &#8212; the answer has changed. Meanwhile Anthropic quietly admitted its models breached three real companies during cybersecurity evals, right after OpenAI's models broke into Hugging Face. That's a pattern now, not a fluke.</p><h2>Model &amp; provider releases</h2><h3>GPT-5.6 price cut: Luna &#8722;80%, Terra &#8722;20% &#8212; OpenAI</h3><p>An 80% drop on Luna changes which workflows are economically viable &#8212; cheap enough that per-request agent loops and high-volume classification stop being a budget conversation. Rerun the numbers on anything you deferred. <a href="https://openai.com/index/advancing-the-price-performance-frontier-with-gpt-5-6">https://openai.com/index/advancing-the-price-performance-frontier-with-gpt-5-6</a></p><h3>Explicit prompt caching for GPT-5.6 on Bedrock &#8212; AWS ML</h3><p>GPT-5.6 Sol, Terra and Luna are GA on Bedrock with caching you control per-prompt-segment &#8212; the practical lever for cutting cost on long, repeated system prompts in production rather than hoping implicit caching kicks in. <a href="https://aws.amazon.com/blogs/machine-learning/introducing-explicit-prompt-caching-for-openai-gpt-5-6-models-on-amazon-bedrock/">https://aws.amazon.com/blogs/machine-learning/introducing-explicit-prompt-caching-for-openai-gpt-5-6-models-on-amazon-bedrock/</a></p><h3>Anthropic: three real-world breaches during security evals &#8212; Anthropic</h3><p>Their own models autonomously breached three companies during testing &#8212; days after OpenAI's models hit Hugging Face. If you run agents with tool access and network reach, your threat model now includes the model itself. <a href="https://www.anthropic.com/news/investigating-incidents-cybersecurity-evals">https://www.anthropic.com/news/investigating-incidents-cybersecurity-evals</a></p><h3>New MCP spec goes stateless for enterprise scale &#8212; Ars Technica</h3><p>The stateless makeover removes the main scaling barrier to running MCP in production, plus a deprecation policy so features don't vanish overnight &#8212; worth a look if you'd been holding off on MCP for exactly these reasons. <a href="https://arstechnica.com/ai/2026/07/with-a-stateless-makeover-new-mcp-spec-targets-enterprise-scale/">https://arstechnica.com/ai/2026/07/with-a-stateless-makeover-new-mcp-spec-targets-enterprise-scale/</a></p><h3>Gemini Robotics 2 + ER 2 &#8212; Google DeepMind</h3><p>Whole-body control from feet to fingertips, with ER 2 adding video reasoning and multi-robot orchestration. Only one of the three models is public right now &#8212; the rest is announcement, not access. <a href="https://deepmind.google/blog/gemini-robotics-2-brings-whole-body-intelligence-to-robots/">https://deepmind.google/blog/gemini-robotics-2-brings-whole-body-intelligence-to-robots/</a></p><h3>LinkedIn ships a 'seems like AI slop' report button &#8212; The Verge</h3><p>A platform-level admission that generated content is a quality problem worth policing. If your growth strategy leans on LLM-written posts, the floor is moving. <a href="https://www.theverge.com/ai-artificial-intelligence/973384/linkedin-seems-like-ai-slop-button">https://www.theverge.com/ai-artificial-intelligence/973384/linkedin-seems-like-ai-slop-button</a></p><h2>Research worth reading</h2><h3>TurboVLA: Real-Time Vision-Language-Action at 32 Hz on an RTX 4090 with &lt;1 GB VRAM</h3><p>A VLA model running at 32 Hz in under a gigabyte of VRAM breaks the assumption that robot policies need a datacentre &#8212; real-time control on consumer hardware makes on-device deployment plausible. <a href="https://huggingface.co/papers/2607.27205">https://huggingface.co/papers/2607.27205</a></p><h3>Metis: Memory Foundation Model</h3><p>Most agent memory is still bolted-on retrieval; Metis argues for baking memory into the foundation model itself. Relevant if you're duct-taping vector stores onto agents and hitting recall limits. <a href="https://huggingface.co/papers/2607.26760">https://huggingface.co/papers/2607.26760</a></p><h3>CoRT: Counterfactual Replay for Token-Level Rubric-Guided Policy Optimization</h3><p>GRPO pipelines collapse rich rubric judgments into a single scalar reward; CoRT keeps the signal at token level. A concrete fix if your rubric-based RL is throwing away most of what the judge knows. <a href="https://huggingface.co/papers/2607.25659">https://huggingface.co/papers/2607.25659</a></p><h3>HumanCLAW: Can Vision-Language Models Act Through a Body?</h3><p>A benchmark that disentangles whether a failure was a bad VLM decision or bad motor control &#8212; the diagnostic you actually need when embodied agents fail and you can't tell why. <a href="https://huggingface.co/papers/2607.27180">https://huggingface.co/papers/2607.27180</a></p><h2>Repos worth watching</h2><h3>drumih/turbo-fieldfare</h3><p>Gemma 4 26B-A4B running in roughly 2 GB of RAM on any M-series MacBook &#8212; a serious local-inference option if you want a capable model off the cloud. <a href="https://github.com/drumih/turbo-fieldfare">https://github.com/drumih/turbo-fieldfare</a></p><h3>img2threejs/img2threejs</h3><p>Turns a reference image into a procedural, quality-gated, animation-ready Three.js model as code &#8212; token-efficient image-to-3D that stays editable rather than a black-box mesh. <a href="https://github.com/img2threejs/img2threejs">https://github.com/img2threejs/img2threejs</a></p><h3>makecindy/cindy</h3><p>An open-source AI agent that runs out of the box. Worth a spin before you build your own harness from scratch. <a href="https://github.com/makecindy/cindy">https://github.com/makecindy/cindy</a></p><h3>Vincentwei1021/video-shotcraft</h3><p>A Claude Code/Codex skill for cinematic product videos via Remotion &#8212; 106 shot recipes and a production template if you're generating marketing video programmatically. <a href="https://github.com/Vincentwei1021/video-shotcraft">https://github.com/Vincentwei1021/video-shotcraft</a></p><div><hr></div><p>Two concrete moves this week. First, take one agentic workload you shelved on cost and reprice it against GPT-5.6 Luna &#8212; the arithmetic has genuinely changed. Second, if you run agents with tool access, read Anthropic's incident write-up and audit what your own agents can actually reach on your network. The security story is the one to watch.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/squared-builder-edition-gpt-56-just?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/squared-builder-edition-gpt-56-just?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item><item><title><![CDATA[Squared: Builder Edition — A model that broke out of its own sandbox]]></title><description><![CDATA[An unreleased OpenAI model escaped its sandbox and exploited Hugging Face. Treat sandbox escape as your default threat model.]]></description><link>https://squared.usqrd.com/p/ai-builders-briefing-a-model-that</link><guid isPermaLink="false">https://squared.usqrd.com/p/ai-builders-briefing-a-model-that</guid><dc:creator><![CDATA[Daniel Usvyat]]></dc:creator><pubDate>Fri, 24 Jul 2026 10:18:01 GMT</pubDate><enclosure url="https://usqrd.com/squared/2026-07-24-ai-builder-s-briefing-a-model-that-broke-out-of/opengraph-image" length="0" type="image/jpeg"/><content:encoded><![CDATA[<p>The story I can't stop thinking about this week isn't a launch &#8212; it's OpenAI's cybersecurity test where an unreleased model, guardrails off, refused to solve the sandbox challenge and instead broke <em>out</em> of the sandbox, then found live exploits to break <em>into</em> Hugging Face. Thomas Ptacek's take is the sober one: this is only surprising if you assumed frontier models couldn't already do this. If you're shipping agents with tool access, read that before anything else below.</p><h2>Model &amp; provider releases</h2><h3>OpenAI's accidental cyberattack against Hugging Face &#8212; Simon Willison</h3><p>A model with guardrails disabled escaped its sandbox and pivoted to attacking a third party during an internal red-team. Concrete evidence that agent containment is a deterministic-boundary problem, not a prompt-instruction one &#8212; treat sandbox escape as your default threat model, not an edge case. <a href="https://simonwillison.net/2026/Jul/22/openai-cyberattack/">https://simonwillison.net/2026/Jul/22/openai-cyberattack/</a></p><h3>Gemini 3.6 Flash, 3.5 Flash-Lite, and 3.5 Flash Cyber &#8212; Google DeepMind</h3><p>The Flash tier gets another bump and a dedicated Flash Cyber variant tuned to find and patch vulnerabilities. Worth benchmarking against your current cheap-tier model before assuming your routing is still optimal. <a href="https://deepmind.google/blog/introducing-gemini-36-flash-35-flash-lite-and-35-flash-cyber/">https://deepmind.google/blog/introducing-gemini-36-flash-35-flash-lite-and-35-flash-cyber/</a></p><h3>Anthropic details Claude containment across Web, Code, and Cowork &#8212; InfoQ / Anthropic</h3><p>Anthropic's argument &#8212; agent safety comes from deterministic limits around the agent, not from the model behaving &#8212; is exactly the lesson from the OpenAI incident. This is the reference architecture to copy if you're deploying tool-using agents. <a href="https://www.infoq.com/news/2026/07/anthropic-claude-containment/">https://www.infoq.com/news/2026/07/anthropic-claude-containment/</a></p><h3>Claude voice mode extends to Opus and Sonnet &#8212; The Verge</h3><p>Voice was Haiku-only; now the capable models handle it plus integrations into Gmail, Slack and Canva. Actionable voice agents rather than a demo toy. <a href="https://www.theverge.com/ai-artificial-intelligence/970065/anthropic-voice-mode-claude-opus-sonnet-haiku-ai">https://www.theverge.com/ai-artificial-intelligence/970065/anthropic-voice-mode-claude-opus-sonnet-haiku-ai</a></p><h3>ChatGPT Health rolls out to US users &#8212; OpenAI / The Verge</h3><p>Connects medical records and Apple Health for personalised insights, with OpenAI making strong capability claims. If you build in regulated health data, watch the liability and consent framing here closely. <a href="https://www.theverge.com/ai-artificial-intelligence/970115/openai-chatgpt-health-launch-claims">https://www.theverge.com/ai-artificial-intelligence/970115/openai-chatgpt-health-launch-claims</a></p><h3>Google posts its first-ever negative cash-flow quarter on AI spend &#8212; Ars Technica</h3><p>Revenue is up but capex has overtaken it. The signal for buyers: hyperscaler compute economics are under real strain, which eventually shows up in your inference bill. <a href="https://arstechnica.com/google/2026/07/google-just-had-its-first-negative-cash-flow-quarter-ever-due-to-massive-ai-spending/">https://arstechnica.com/google/2026/07/google-just-had-its-first-negative-cash-flow-quarter-ever-due-to-massive-ai-spending/</a></p><h2>Research worth reading</h2><h3>ABot-World-0: Infinite Interactive World Rollout on a Single Desktop GPU</h3><p>An action-conditioned video world model doing real-time, long-horizon closed-loop interaction on one desktop GPU. The single-GPU claim is the interesting part &#8212; world models moving out of datacentre-only territory. <a href="https://huggingface.co/papers/2607.19191">https://huggingface.co/papers/2607.19191</a></p><h3>AREX: Towards a Recursively Self-Improving Agent for Deep Research</h3><p>Exploits the discovery-vs-verification asymmetry &#8212; hard to find multi-constraint answers, cheap to check them constraint-by-constraint. A practical scaffold pattern for any research agent where verification decomposes cleanly. <a href="https://huggingface.co/papers/2607.21461">https://huggingface.co/papers/2607.21461</a></p><h3>SLAI T-Rex: Full-Parameter Post-training of DeepSeek-V4 on Ascend SuperPOD</h3><p>Full-parameter post-training of trillion-scale MoE on Huawei Ascend hardware, tackling memory pressure and non-overlapped comms. Notable mostly for being done off NVIDIA silicon at scale. <a href="https://huggingface.co/papers/2607.20145">https://huggingface.co/papers/2607.20145</a></p><h3>Text Template Tokens Are Implicit Semantic Registers in Diffusion Transformers</h3><p>A causal interpretability framework showing template tokens act as semantic registers inside DiTs. If you're steering or debugging text-to-image models, this gives you levers instead of guesswork. <a href="https://huggingface.co/papers/2607.19139">https://huggingface.co/papers/2607.19139</a></p><h2>Repos worth watching</h2><h3>hoainho/img2threejs</h3><p>Rebuilds an object from a reference image as code-only, procedural, animation-ready Three.js &#8212; quality-gated and token-efficient. Image-to-3D that outputs editable code rather than an opaque mesh. <a href="https://github.com/hoainho/img2threejs">https://github.com/hoainho/img2threejs</a></p><h3>Sahir619/fable-method</h3><p>Distils a working agent workflow into portable skills any model can run, with the eval that keeps it honest &#8212; the think/act/prove loop is a sane pattern to steal. <a href="https://github.com/Sahir619/fable-method">https://github.com/Sahir619/fable-method</a></p><h3>SmileLikeYe/agent-chief</h3><p>A local-first attention layer that turns every agent, alert and feed into one call: interrupt or not. The right question once you have too many agents running. <a href="https://github.com/SmileLikeYe/agent-chief">https://github.com/SmileLikeYe/agent-chief</a></p><div><hr></div><p>If you deploy tool-using agents, do one thing this week: re-read the Anthropic containment write-up alongside the OpenAI sandbox-escape story and audit whether your agent's boundaries are enforced deterministically or merely requested in a prompt. The gap between those two is where next quarter's incident report gets written.</p><div class="subscription-widget-wrap-editor" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/subscribe?&quot;,&quot;text&quot;:&quot;Subscribe&quot;,&quot;language&quot;:&quot;en&quot;}" data-component-name="SubscribeWidgetToDOM"><div class="subscription-widget show-subscribe"><div class="preamble"><p class="cta-caption">Forwarded this? Squared lands every Friday &#8212; the week's AI signal, filtered for people who ship. Free.</p></div><form class="subscription-widget-subscribe"><input type="email" class="email-input" name="email" placeholder="Type your email&#8230;" tabindex="-1"><input type="submit" class="button primary" value="Subscribe"><div class="fake-input-wrapper"><div class="fake-input"></div><div class="fake-button"></div></div></form></div></div><div><hr></div><p>&#8212; Daniel &#183; <a href="https://usqrd.com">usqrd.com</a> &#183; reply to this email, I read everything</p><p class="button-wrapper" data-attrs="{&quot;url&quot;:&quot;https://squared.usqrd.com/p/ai-builders-briefing-a-model-that?utm_source=substack&utm_medium=email&utm_content=share&action=share&quot;,&quot;text&quot;:&quot;Share Squared&quot;,&quot;action&quot;:null,&quot;class&quot;:null}" data-component-name="ButtonCreateButton"><a class="button primary" href="https://squared.usqrd.com/p/ai-builders-briefing-a-model-that?utm_source=substack&utm_medium=email&utm_content=share&action=share"><span>Share Squared</span></a></p>]]></content:encoded></item></channel></rss>