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<h1><strong> TLDR Dev <span id="date">2025-12-17</span></strong></h1>
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<strong>Introducing AI for Deep Coverage—New from QA Wolf (Sponsor)</strong>
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When prompting v0 to build web apps or components, it's important to know three core methods: specify the product service (components, data, and actions), define the context of use (who, when, and for what outcome), and outline constraints and taste (style, platform, and layout). By providing these specific details, v0 can generate faster, make smarter UX decisions, and create cleaner, more maintainable code.
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CVE‑2025‑55182 is a critical Remote Code Execution vulnerability in React 19 Server Component infrastructure prior to the December 2025 security patch. The vulnerability is unauthenticated and pre-render. A single crafted HTTP request to a Server Function endpoint is enough, making it a high-severity vulnerability for production applications. This post explains how the vulnerability works in detail, details how it was fixed, and lists mitigation steps.
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Claude Code can be customized with skills, plugins, commands, and configuration files. While the defaults are remarkably capable, the system can be adjusted to fit any workflow - the difference is like hiring a talented generalist versus hiring someone who's worked at your company for years. This guide teaches readers how to optimize the assistant so it matches their style. It can take some time to optimize Claude, but doing so means you won't have to constantly re-explain preferences or correct patterns.
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<strong>AI will replace you at your job if you let it (7 minute read)</strong>
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While AI won't cause mass unemployment, carelessly offloading core job functions to it is the same as writing one's own pink slip. This is especially harmful to junior talent as it prevents them from developing essential skills and intuition that's needed for them to become senior.
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<strong>No Graphics API (93 minute read)</strong>
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Modern graphics APIs like DirectX 12 and Vulkan are overly complex and inefficient because they were designed for older, more diverse GPU architectures. Today's GPUs, with features like coherent caches, 64-bit pointers, and bindless texture sampling, have mostly converged on a generic SIMD design. This article proposes a simplified API that uses these modern hardware capabilities to reduce API bloat, driver complexity, and pipeline state object "permutation explosion.”
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<h1><strong>Launches & Tools</strong></h1>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fblog.sentry.io%2Fless-than-100ms-e-commerce-instant-loads-with-speculation-rules-api%2F%3Futm_source=tldr%26utm_medium=paid-community%26utm_campaign=general-fy26q4-ecommerce%26utm_content=newsletter-100ms-ecomm-blog-learnmore/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/kT1tBSDktm_qLcW5RQEw9YUwG4XdKWzF4z6v-40xQAo=436">
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<strong>How to get <100ms E-commerce store loads (Sponsor)</strong>
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Lazar Nikolov wrote on the Sentry blog about <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fblog.sentry.io%2Fless-than-100ms-e-commerce-instant-loads-with-speculation-rules-api%2F%3Futm_source=tldr%26utm_medium=paid-community%26utm_campaign=general-fy26q4-ecommerce%26utm_content=newsletter-100ms-ecomm-blog-learnmore/2/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/6N6i3LuiAUkFEa2dyxAXQYMd5lm-enJv1LcOxx73ebw=436" rel="noopener noreferrer nofollow" target="_blank"><span>how to get sub-100ms load times</span></a> using the Speculation Rules API – which lets the browser prefetch the pages users are about to click.
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<strong>ty (8 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
ty is an extremely fast Python type checker and language server. It is designed to be an alternative to tools like mypy, Pyright, and Pylance. The entire ty architecture is built around incrementality, so developers can selectively re-run only the necessary computations when a file is edited or an individual function is modified. ty has a best-in-class diagnostic system that can pull context from multiple files at once to explain what's wrong, why, and how to fix it.
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<strong>Sonda (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Sonda is a universal bundle analyzer and visualizer for JavaScript and CSS projects. It generates interactive HTML reports by analyzing source maps and showing module sizes after tree-shaking and minification.
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<div style="text-align: center;"><span style="font-size: 36px;">🎁</span></div></div>
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fresources.github.com%2Factions%2F2026-pricing-changes-for-github-actions%2F%3Futm_source=tldrdev/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/YdHfUWXY-hfeKrioLgu6QBRYjuuaWYC-NqJ3_hXOalc=436">
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<strong>Pricing changes for GitHub Actions (7 minute read)</strong>
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GitHub has announced pricing and product model updates for GitHub Actions that will take effect in 2026. Beginning January 1, prices for GitHub-hosted runners will be reduced by up to 39%, while a new $0.002 per-minute cloud platform charge will be introduced for all Actions workflows, including self-hosted runners, starting March 1.
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fblog.bytebytego.com%2Fp%2Fhow-linkedin-built-an-ai-powered%3Futm_source=tldrdev/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/PiemropaEd8nAnwUwacNC8skkImiPkd3lVpG_S1wMgE=436">
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<strong>How LinkedIn Built an AI-Powered Hiring Assistant (20 minute read)</strong>
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LinkedIn's Hiring Assistant is designed to handle the repetitive, time-consuming aspects of the recruiting workflow. It frees professionals to focus on connecting with people and making critical hiring choices. The assistant improves over time by observing what recruiters do, learning individual preferences, and remembering past interactions and decisions. This article looks at the architecture and technical building blocks of the assistant.
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<div style="text-align: center;"><span style="font-size: 36px;">⚡</span></div></div>
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<h1><strong>Quick Links</strong></h1>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.skyramp.dev%2F%3Futm_campaign=Beta1225%26utm_source=tldrdev%26utm_medium=newsletter/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/oXtFFUv7WbNuT_h0v__fkqKfixucgybN0-N0AK7D9go=436">
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<strong>Skyramp: Deterministic testing, powered by AI (Sponsor)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Automated testing that's conversational, intelligent, and deterministic. Skyramp blends AI orchestration with specification-driven design to generate production-ready tests from natural language. <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fskyramp.dev%2F%3Futm_campaign=Beta1225%26utm_source=tldrdev%26utm_medium=newsletter/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/sV4ijT5-dBlFUuW_VUYI6MbqWhWp_1ZfKBMNC7L-wrc=436" rel="noopener noreferrer nofollow" target="_blank"><span>Join the beta in Cursor or VS Code</span></a>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fsimonwillison.net%2F2025%2FDec%2F15%2Fporting-justhtml%2F%3Futm_source=tldrdev/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/1oL3LKHTPHkOTcUkJMEe61AcTdqIyokAKrkRjFDK5-o=436">
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<strong>I ported JustHTML from Python to JavaScript with Codex CLI and GPT-5.2 in 4.5 hours (11 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Simon Willison successfully ported the JustHTML Python library to JavaScript using Codex CLI and GPT-5.2 with only a few prompts in 4.5 hours.
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fa2ui.org%2F%3Futm_source=tldrdev/1/0100019b2c35b225-d6771eba-e760-42ce-bab2-f2619f1bc3ba-000000/YOZEm8tL1WEbQBWI2gnXOCsX6yRJnpgHBHJnOkZApWA=436">
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<strong>A2UI (Website)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
A2UI is a protocol that lets AI agents generate interactive user interfaces for web, mobile, and desktop applications by sending declarative component descriptions rather than executable code.
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<strong>Sqlit (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Sqlit is a lightweight, user-friendly terminal user interface for fast querying of SQL databases such as Postgres, MySQL, and SQLite.
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<strong>Letta Code (Website)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Letta Code is a memory-first coding agent designed for long-lived agents that continually learn and improve across independent sessions.
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