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This week in Claude Code, Codex and Gemini CLI (week of September 20, 2026)

Originally published at https://aicoding-guide.com . The headline this week is that Claude Code now reads AGENTS.md directly (v2.1.277). Until now you had to import it from a CLAUDE.md ; in a repository without one, it is simply read. Second: the 2.1.268 change this digest reported last week as a permission-bypass fix was reverted in 2.1.273 . If you relied on that behavior, it is back to what it was. Covered here: Claude Code 2.1.270 through 2.1.277, Codex CLI 0.155.0 and 0.155...
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Logging Every tmux Pane

The tmux-logging plugin is a manual toggle. I wanted every pane logged from the moment it exists, in a file I can actually read. Written and tested on macOS (tmux 3.7c, BSD awk 20200816, zsh). The awk is plain POSIX, so it should carry to Linux, but I have not tested it there. 1. Install tpm and create the log directory git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm mkdir -p ~/.tmux/logs 2. Put this in ~/.tmux.conf Replace...
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Svelte's runes are just React hooks wearing a Svelte hoodie

Svelte convinced me with a promise. You write let count = 0 , then modify that, and the UI updates magically. No need for hooks. No dependency arrays. No complex setup. That was the main idea behind it. After that, Svelte 5 introduced runes. And the magic left without us noticing. 🎒 What actually changed The release of Svelte 5 was announced on September 20, 2023, and was finally stabilized in late 2024. This version introduced a concept called runes: $state , $derived , and ...
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Reading the Anthropic Threat Intelligence Report as a Defenders' Checklist, Not a News Cycle

Reading the Anthropic Threat Intelligence Report as a Defenders' Checklist, Not a News Cycle Opening Anthropic's September 2026 threat intelligence report, "Detecting and countering misuse of AI," describes campaigns its team disrupted between December 2025 and August 2026. The notable finding for defenders is not a new technique. The report states plainly that the intrusions it describes relied on stolen accounts and unpatched edge devices. What changed is tempo: single operato...
The story of morphing-scroll, my npm library
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The story of morphing-scroll, my npm library

I want to tell you about my npm library — my second npm project, and the most complex one I've built so far. I won't dig deep into the code: this is the story of how and why it came to be. Introduction Around 2015 I landed my first job as a UI/UX designer. I drew interfaces for mobile and desktop apps in Sketch, which everyone used back then, on a Mac the company gave me, and I was genuinely happy about it. Things went well: I followed the iOS and Android guidelines, and w...
Cua: Open-Source Computer-Use Infrastructure & Drivers for AI Agents
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Cua: Open-Source Computer-Use Infrastructure & Drivers for AI Agents

The landscape of AI-assisted software development is undergoing a fundamental evolution. For the past two years, AI coding assistants have operated almost entirely inside terminal buffers and text editors. However, practical software engineering tasks frequently require interacting with graphical user interfaces: verifying layout behavior in browsers, inspecting spreadsheet data, configuring desktop virtualization tools, or triaging issues across native desktop applications. This e...
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Entendiendo la desestructuración en Javascript

La desestructuración es simplemente tomar una estructura de información y “romperla” de tal manera que podamos hacer uso de cada pieza de forma individual. Si buscamos una analogía sencilla, la desestructuración es el equivalente a “desempacar” ciertos artículos personales de nuestra mochila de viaje. En este sentido, nuestra mochila toma la forma de un arreglo, objeto, cadena de caracteres o cualquier tipo de estructura que posea un comportamiento Iterable (en otra oportunidad hab...
Nuevas instancias T8i, ¿hora de jubilar tus T3i?
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Nuevas instancias T8i, ¿hora de jubilar tus T3i?

Introducción: ¿Qué ofrece la familia T8i? Las instancias Amazon EC2 T8i son la versión más reciente de instancias burstable de bajo costo en AWS. Están impulsadas por el AWS Nitro System y procesadores personalizados Intel Xeon Scalable de 6.ª generación (Granite Rapids) . Diseñadas para cargas de trabajo con uso de CPU de bajo a moderado (como microservicios, entornos de desarrollo/pruebas, sitios web de bajo tráfico y procesamiento por lotes). ¿Y cual es la diferencia con mis ve...
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anything2explainer Packages Remotion Explainers as an Agent Skill

anything2explainer packages a Claude Code and Codex skill that turns a topic, article or document into a narrated explainer video. Developers get a code-first production path: every frame is drawn with Remotion in React and TypeScript, rather than assembled from stock footage or produced by a generative video model, so individual shots remain editable as source code. The project targets a 1280×720, 30fps H.264 MP4 with synchronized voiceover, word-aligned subtitles, chapter cards, a top HUD ...
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Auto-localize prices in React with react-currency-localizer-realtime

If you sell to international customers, showing prices in the visitor's local currency isn't a nice-to-have — it's a conversion-rate lever. But wiring it up usually turns into a small project: IP geolocation, exchange-rate fetching, caching, fallbacks, race conditions when the rate call is slower than render. react-currency-localizer-realtime compresses all of that into a React hook and a component. Drop it in, pass a price, done. Under the hood it uses real-time mid-market rates from ...
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Types of Context Rot in Harness Engineering

If you've ever worked with an LLM-powered agent long enough for a session to grow, you've probably felt it. Instructions that worked perfectly in a fresh conversation get quietly ignored 15 turns in. The agent starts referencing things it shouldn't. Retrieved snippets that were relevant three queries ago somehow bleed into an answer to a completely different question. Everything looks fine — no errors, no crashes — but the quality of reasoning has visibly degraded. That set of degradations ...
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The Database I Deleted: Migrating an Agentic RAG App to AWS Serverless #3

Part 3 of 3 — bugs, numbers, and what generalizes Part 1 covered why an agentic RAG assistant moved off a single EC2 box onto AWS serverless, and the resulting architecture. Part 2 walked through five decisions that didn't survive contact with AWS's fine print: a database that turned out to be a file, why there's no streaming, an auth design CloudFront can't do, what Bedrock batch inference can't give you, and where the vector text actually lives. This part is the payoff — what the migr...
HackerNews

Gemini AI hacked three other companies during a test

Article URL: https://news.sky.com/story/googles-gemini-ai-hacks-three-other-companies-during-security-test-13589551 Comments URL: https://news.ycombinator.com/item?id=49768509 Points: 1 # Comments: 0
HackerNews

Ask HN: How do you interview devs in a post-AI world?

Since the rise of AI coding assistants, about 80% of the dev candidates that I interview tell me that they aren't writing much code themselves anymore - they are directing agents instead. This makes me deeply uncomfortable (although maybe I'm just being old-fashioned). I still want to know that devs on my team can actually write code themselves, and have some idea of what they are doing when it comes to system design. This is increasingly challenging given how rapidly the AI tools are evolving. ...
HackerNews

Trump says he will create 'AI Force,' name AI czar

Article URL: https://www.reuters.com/world/us/trump-says-he-will-create-ai-force-name-ai-czar-2026-09-19/ Comments URL: https://news.ycombinator.com/item?id=49768880 Points: 5 # Comments: 0
HackerNews

Microsoft director: AI scraping 'the largest theft of labor in human history'

Article URL: https://www.tomshardware.com/tech-industry/artificial-intelligence/microsoft-director-called-ai-scraping-the-largest-theft-of-labor-in-human-history-while-openai-head-brands-chatgpt-an-existential-threat-to-publishers-revelations-come-from-legal-briefs-filed-in-nyt-lawsuit Comments URL: https://news.ycombinator.com/item?id=49768921 Points: 10 # Comments: 2
HackerNews

When Does AI Stop Needing Us?

Article URL: https://cacm.acm.org/blogcacm/when-does-ai-stop-needing-us/ Comments URL: https://news.ycombinator.com/item?id=49769084 Points: 2 # Comments: 0
HackerNews

Trump Announces an 'AI Force'

Article URL: https://www.wsj.com/tech/ai/trump-announces-an-ai-force-after-industry-sounded-alarm-7c189b8f Comments URL: https://news.ycombinator.com/item?id=49769086 Points: 5 # Comments: 0