Daily Brief
Slash Stack — September 28, 2026
A ranked daily snapshot of AI, software, systems, infrastructure, agents, blockchain, research, and tools from Discover.
Top story
Prompting Claude Opus 5.5
platform.claude.com · 165 pts · 174 comments
What matters today
Your final chance to grab your exhibit table at TechCrunch Disrupt 2026 is Oct. 2
TechCrunch AI
The last day to book your Disrupt 2026 exhibit table is this Friday, October 2 at 11:59 p.m. PT. Secure your exhibit table and get your startup in front of 10,000+ founders, investors and tech leaders at San Francisco’s Moscone West on Oct 13-15.
Insuretech Outmarket raises $34.5M just months after prior round
TechCrunch AI
The startup uses AI to automate tedious paperwork for insurance agencies and brokers.
Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page
Hacker News · 20 pts · 4 comments
Fridge magnet shopping list on an M5Stack PaperMono (ESP32-S3, e-ink touchscreen), synced with a phone web app over Wi-Fi. Works offline, ~2,400 lines of C++. This is a great wee device! BLE, Wi-Fi and LoRa on one board makes it flexible for way more than a shopping list, this is just what I built first. This firmware only uses Wi-Fi. Fully vibe-coded with Claude Code, I didn’t hand-write this. I wanted to see how Claude would get on with building something useful for a new hardware device. As it’s stuck to the fridge it’s easy for the family to use, and it’s already being used day to day which I’ll admit is a first for a home built project…
AI companies in race to demonstrate their model most threatening to humanity
Hacker News · 318 pts · 239 comments
Anthropic Launches Claude Plugin Directory Submission Portal for Developers claude.com · Show TLDR
claude.com
Tools & releases
Show HN: OpenAPPA – open-source deterministic guardrails that don’t break agents
Show HN · 18 pts · 7 comments
Hi Hacker News! Matvey, one of the authors, is here. While building enterprise agents, we ran into a problem: the more tools you connect to the AI, the higher the chance it will run out of control and leak sensitive data. Guardrails, in theory, should prevent this, but the situation is worrying: - Non-deterministic guardrails (LLM as a judge, auto modes, etc.) are vulnerable to prompt injections, or they lack knowledge of the data, making them inefficient (~10% data leaks on our benchmarks). - Existing deterministic guardrails (Cedar, OPA, FIDES, Dogwood) require massive case-specific IF-ELSE-like policies and break agents (~59% utility loss…
Show HN: Fusor – Like Vue, but the logic is Rust
Show HN · 6 pts · 1 comments
I’ve been building Fusor. It’s a reactive web framework for Rust where the templates are plain HTML files, so there’s no markup living inside Rust macros like view! or rsx!. The state and logic live in ordinary Rust structs, and the whole app compiles to WASM. It also benefits from Rust type checkers, even for the HTML bindings. The Fusor website is fully built using the framework. It’s all experimental, so I expect breaking changes and lots of refactors. Any feedback is welcome, and so are contributions! The project is pro AI, if you do decide to contribute.
Research worth reading
Thinking Less to Simulate Better: Intuitive Prompting Improves LLM Agents Simulating Individual Social Media Reactions, Including Unfamiliar Content
arXiv cs.AI
arXiv:2609.30563v1 Announce Type: new Abstract: Platform policies are increasingly tested on artificial users, making agent fidelity important. Yet convincing fake profiles could also manipulate perceived public opinion before elections. Validation has concentrated on agreement with human behaviour and has paid little attention to whether an agent behaves in line with the profile it was given. The present study profiled eight Serbian participants through a questionnaire, a deep interview, and a written self-presentation, recorded their reactions to sixty-eight social media posts, and asked four language models to predict those reactions under…
Atelier: Learning Local Self-Supervised Features for CryoEM Volumes via Hypernetworks
arXiv cs.AI
arXiv:2609.30569v1 Announce Type: new Abstract: CryoEM map interpretation requires features that are spatially localized, consistent across samples, and informative across spatial scales. Most deep learning methods for map annotation extract features from fixed voxel grids. However, implicit neural representations (INRs) are able to model volumetric data as scale-agnostic, coordinate-conditioned functions. INRs are therefore attractive for cryoEM, but fitting a separate INR for each map is too expensive for large-scale feature extraction and produces representations that are not aligned across samples. We introduce Atelier, a self-supervised…
Thinking fast and slow in AI: The role of metacognition (2021)
arXiv · 135 pts · 46 comments
Articles
Introducing The Cold Start: pitch your startup live at Cloudflare Connect
Cloudflare Blog
Cloudflare is launching The Cold Start, a startup competition giving five early-stage companies five minutes on stage at Cloudflare Connect. Grand Prize winner receives $500,000 in credits, a San Francisco billboard, and an invitation to our VIP speakers dinner.
Supporting native Rust in Workers with the new Emscripten target for wasm-bindgen
Cloudflare Blog
With the new experimental support for the Emscripten target in Rust Workers, many previously unsupported Rust libraries and applications can now be built and deployed directly to Cloudflare’s global Workers platform, including upcoming support for Tokio async.
Who’s liable when AI agents go rogue?
MIT Technology Review AI
MIT Technology Review Explains: Let our writers untangle the complex, messy world of technology to help you understand what’s coming next. You can read more from the series here. Over the past few months, a cascade of cyberattacks by AI agents has stunned the world. In July, OpenAI disclosed that a swarm of its agents…
Hacker News signal
There are no “rogue” AI agents
Hacker News · 376 pts · 260 comments
AI companies in race to demonstrate their model most threatening to humanity
Hacker News · 318 pts · 239 comments
Prompting Claude Opus 5.5
platform.claude.com · 165 pts · 174 comments
Thinking fast and slow in AI: The role of metacognition (2021)
arXiv · 135 pts · 46 comments
Show HN: TinyAIArena watch AI agents battle it out
Hacker News · 114 pts · 45 comments
Did you ever click on an “AI Arena” expecting glorious battle and instead get a boring benchmark? If so, this project is for you: proper life-or-death fights between four models on a picturesque 8×8 grid. May the most intelligent one win! Click on any of the matches to spectate them. Code: https://github.com/hp6/ai-arena
This snapshot is generated automatically from the Discover ranking pipeline. It is a selection layer, not original reporting or AI-generated analysis.