7.1.25 | AI's new skill is context engineering, Xfinity detects motion via WiFi signals, Proton sues Apple for harmful practices

This is a recap of the top 10 posts on Hacker News on Jul 1, 2025.The new skill in AI is not prompting, it's context engineeringhttps://www.philschmid.de/context-engineeringhttps://news.ycombinator.com/item?id=44427757Xfinity using WiFi signals in your house to detect motionhttps://www.xfinity.com/support/articles/wifi-motionhttps://news.ycombinator.com/item?id=44426726Proton joins suit against Apple for practices that harm developers and consumershttps://proton.me/blog/apple-lawsuithttps://news.ycombinator.com/item?id=44426128I write type-safe generic data structures in Chttps://danielchasehooper.com/posts/typechecked-generic-c-data-structures/https://news.ycombinator.com/item?id=44425461YouTube No Translationhttps://addons.mozilla.org/en-GB/firefox/addon/youtube-no-translation/https://news.ycombinator.com/item?id=44416009Melbourne man discovers extensive model train network underneath househttps://www.sbs.com.au/news/article/i-was-shocked-melbourne-mans-unbelievable-find-after-buying-house/m4sksfer8https://news.ycombinator.com/item?id=44429182Donkey Kong Country 2 and Open Bushttps://jsgroth.dev/blog/posts/dkc2-open-bus/https://news.ycombinator.com/item?id=44424194Claude Code now supports Hookshttps://docs.anthropic.com/en/docs/claude-code/hookshttps://news.ycombinator.com/item?id=44429225The hidden JTAG in a Qualcomm/Snapdragon device’s USB porthttps://www.linaro.org/blog/hidden-jtag-qualcomm-snapdragon-usb/https://news.ycombinator.com/item?id=44426428End of an Erahttps://www.erasmatazz.com/personal/self/end-of-an-era.htmlhttps://news.ycombinator.com/item?id=44426845