Show HN: HAL – Harmful Action Limiter: Lean command guard for AI coding agents. https://ift.tt/kn8XmzA

Show HN: HAL – Harmful Action Limiter: Lean command guard for AI coding agents. https://ift.tt/xdKalNF March 13, 2026 at 04:36AM

Show HN: Algorithms and Data Structures in TypeScript – Free Book (~400 Pages) https://ift.tt/THwjLbu

Show HN: Algorithms and Data Structures in TypeScript – Free Book (~400 Pages) I started writing this book 10 years ago in JavaScript, got through a few chapters (asymptotic notation, basic techniques, start of sorting), and then abandoned it. Recently I picked it back up, converted everything to TypeScript, and used AI (Zenflow [1] + Claude Opus 4.6) to complete the remaining chapters. I provided the structure, direction, and initial chapters; the AI generated the bulk of the remaining content under a spec-driven workflow. The book covers roughly a first 1-2 year CS curriculum: sorting, dynamic programming, graph algorithms, trees, heaps, hash tables, and more. All code is executable, typed with generics/interfaces, and covered with tests. I've thoroughly reviewed several chapters (sorting, DP, graphs) and done a high-level pass on the rest. Currently in beta — corrections and contributions are welcome. MIT licensed. Inspired by Wirth's "Algorithms and Data Structures", SICP, and CLRS. Code and tests: https://ift.tt/fNtIWVz [1] https://ift.tt/PpFYfKq http://amoilanen.github.io/Algorithms-with-Typescript/ March 13, 2026 at 02:15AM

Show HN: What was the world listening to? Music charts, 20 countries (1940–2025) https://ift.tt/dFVBlRA

Show HN: What was the world listening to? Music charts, 20 countries (1940–2025) I built this because I wanted to know what people in Japan were listening to the year I was born. That question spiraled: how does a hit in Rome compare to what was charting in Lagos the same year? How did sonic flavors propagate as streaming made musical influence travel faster than ever? 88mph is a playable map of music history: 230 charts across 20 countries, spanning 8 decades (1940–2025). Every song is playable via YouTube or Spotify. It's open source and I'd love help expanding it — there's a link to contribute charts for new countries and years. The goal is to crowdsource a complete sonic atlas of the world. https://88mph.fm/ March 10, 2026 at 06:18AM

Show HN: fftool – A Terminal UI for FFmpeg – Shows Command Before It Runs https://ift.tt/sfLNZam

Show HN: fftool – A Terminal UI for FFmpeg – Shows Command Before It Runs https://ift.tt/BuGC3nI March 13, 2026 at 12:08AM

Show HN: Run an Agent Council of LLMs that debate and synthesize answers https://ift.tt/4UQNcqL

Show HN: Run an Agent Council of LLMs that debate and synthesize answers I built a local-first UI that adds two reasoning architectures on top of small models like Qwen, Llama and Mistral: a sequential Thinking Pipeline (Plan → Execute → Critique) and a parallel Agent Council where multiple expert models debate in parallel and a Judge synthesizes the best answer. No API keys, zero .env setup — just pip install multimind. Benchmark on GSM8K shows measurable accuracy gains vs. single-model inference. https://ift.tt/ac4tW0J March 12, 2026 at 03:26AM

Show HN: I built a screen recorder with automatic zoom effects https://ift.tt/JNLVb7C

Show HN: I built a screen recorder with automatic zoom effects https://rookieclip.com/ March 12, 2026 at 12:51AM

Show HN: Faster, cheaper Claude Code with local semantic code search via sqlite https://ift.tt/oHt1dC4

Show HN: Faster, cheaper Claude Code with local semantic code search via sqlite https://ift.tt/WhVRmy9 March 11, 2026 at 03:49AM