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Rivian unveils its custom silicon R2 LiDAR, a roadmap for universal hands-free driving, and details on its next-generation autonomy platform. The article highlights Rivian's advancements in developing in-house technology to enhance the safety and capabilities of its electric vehicles.

See also: https://blog.cloudflare.com/react2shell-rsc-vulnerabilities-..., https://nextjs.org/blog/security-update-2025-12-11

Hey HN, Waleed here. We're building Sim (https://sim.ai/), an open-source visual editor to build agentic workflows. Repo here: https://github.com/simstudioai/sim/. Docs here: https://docs.sim.ai.

You can run Sim locally using Docker, with no execution limits or other restrictions.

We started building Sim almost a year ago after repeatedly troubleshooting why our agents failed in production. Code-first frameworks felt hard to debug because of implicit control flow, and workflow platforms added more overhead than they removed. We wanted granular control and easy observability without piecing everything together ourselves.

We launched Sim [1][2] as a drag-and-drop canvas around 6 months ago. Since then, we've added:

- 138 blocks: Slack, GitHub, Linear, Notion, Supabase, SSH, TTS, SFTP, MongoDB, S3, Pinecone, ...

- Tool calling with granular control: forced, auto

- Agent memory: conversation memory with sliding window support (by last n messages or tokens)

- Trace spans: detailed logging and observability for nested workflows and tool calling

- Native RAG: upload documents, we chunk, embed with pgvector, and expose vector search to agents

- Workflow deployment versioning with rollbacks

- MCP support, Human-in-the-loop block

- Copilot to build workflows using natural language (just shipped a new version that also acts as a superagent and can call into any of your connected services directly, not just build workflows)

Under the hood, the workflow is a DAG with concurrent execution by default. Nodes run as soon as their dependencies (upstream blocks) are satisfied. Loops (for, forEach, while, do-while) and parallel fan-out/join are also first-class primitives.

Agent blocks are pass-through to the provider. You pick your model (OpenAI, Anthropic, Gemini, Ollama, vLLM), and and we pass through prompts, tools, and response format directly to the provider API. We normalize response shapes for block interoperability, but we're not adding layers that obscure what's happening.

We're currently working on our own MCP server and the ability to deploy workflows as MCP servers. Would love to hear your thoughts and where we should take it next :)

[1] https://news.ycombinator.com/item?id=43823096

[2] https://news.ycombinator.com/item?id=44052766

The article is a letter from the founder of System76, the company behind the Pop!_OS Linux distribution, discussing the company's commitment to open source, its vision for the future of Pop!_OS, and its efforts to maintain a strong community around the operating system.

The article explores the rise of '404 Media', a zine that celebrates the affinity between Linux and creative communities. It examines how the zine serves as a platform for showcasing the diverse applications of Linux in art, music, and other creative endeavors.

The article explores the evolution of medieval architecture, highlighting the transition from the use of timber to stone construction. It examines the technological and societal factors that drove this shift, which had a profound impact on the aesthetic and structural design of medieval buildings.

I’ve been working on gotui, a modern fork of the unmaintained termui, rebuilt on top of tcell for TrueColor, mouse support, and proper resize handling. It keeps the simple termui-style API, but adds a bunch of new widgets (charts, gauges, world map, etc.), nicer visuals (collapsed borders, rounded corners), and input components for building real dashboards and tools. Under the hood the renderer’s been reworked for much better performance, and I’d love feedback on what’s missing for you to use it in production.

Stoolap is an open-source, self-hosted application platform that simplifies the process of deploying and managing web applications. It provides a unified interface for managing multiple applications, databases, and other services, making it easier to develop and maintain complex software projects.

Next.js releases a security update addressing vulnerabilities in earlier versions. The update provides important security fixes and improvements to enhance the overall security of Next.js applications.

The article discusses the global impact of the COVID-19 pandemic, including its effect on the economy, travel, and daily life, as well as the efforts made by governments and individuals to combat the spread of the virus and mitigate its consequences.

The article discusses the growing trend of age verification on the internet, outlining the potential risks and providing a resource hub to help users fight back against these measures, which could undermine online privacy and free expression.

The article reports that 23,746 patients died while on waitlists for medical treatment in the past year, highlighting the urgent need to address delays and improve access to healthcare.

The article discusses the development of a new drought-tolerant maize variety by researchers in Kenya, which is expected to help smallholder farmers improve their yields and food security in the face of climate change and unpredictable weather patterns.

Deno version 2.6 introduces several improvements, including better performance, more secure defaults, and new features such as a new debugger and support for streaming responses.

The article discusses Augment's choice of GPT-5.2 as their model for code review, highlighting its advanced capabilities in understanding and analyzing code, as well as its ability to provide contextual feedback and suggestions to developers.

The article explores how Flock Safety, a private company providing license plate reader cameras, continued operating in some cities even after local authorities asked them to turn off the cameras. The article examines the company's practices and the implications for privacy and law enforcement oversight.

OpenAI, the artificial intelligence research company, has launched Gemini, a new AI system intended to be more powerful and capable than its previous model, GPT-3. The launch comes amid concerns about the potential risks and misuse of advanced AI technology.

An outbreak of measles in the southern United States has led to hundreds of people being quarantined, as health officials work to contain the spread of the highly contagious disease.

A study found that COVID-19 vaccines reduced emergency room visits for children by 76%, highlighting the vaccines' effectiveness in preventing severe illness in young populations.

Researchers have discovered malicious Visual Studio Code extensions on the Marketplace that conceal a Trojan in a fake PNG file, potentially compromising users' systems. The extensions were designed to bypass security checks and deliver malware to unsuspecting developers.