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Show HN: Astroworld – A universal N-body gravity engine in Python https://ift.tt/fYAbJ3v

Show HN: Astroworld – A universal N-body gravity engine in Python I’ve been working on a modular N-body simulator in Python called Astroworld. It started as a Solar System visualizer, but I recently refactored it into a general-purpose engine that decouples physical laws from planetary data.Technical Highlights:Symplectic Integration: Uses a Velocity Verlet integrator to maintain long-term energy conservation ($\Delta E/E \approx 10^{-8}$ in stable systems).Agnostic Architecture: It can ingest any system via orbital elements (Keplerian) or state vectors. I've used it to validate the stability of ultra-compact systems like TRAPPIST-1 and long-period perturbations like the Planet 9 hypothesis.Validation: Includes 90+ physical tests, including Mercury’s relativistic precession using Schwarzschild metric corrections.The Planet 9 Experiment:I ran a 10k-year simulation to track the differential signal in the argument of perihelion ($\omega$) for TNOs like Sedna. The result ($\approx 0.00...
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Show HN: PostForge – A PostScript interpreter written in Python https://ift.tt/cfo2Pyv

Show HN: PostForge – A PostScript interpreter written in Python Hi HN, I built a PostScript interpreter from scratch in Python. PostForge implements the full PostScript Level 2 specification — operators, graphics model, font system, save/restore VM, the works. It reads .ps and .eps files and outputs PNG, PDF, SVG, or renders to an interactive Qt window. Why build this? GhostScript is the only real game in town for PostScript interpretation, and it's a 35-year-old C codebase. I wanted something where you could actually read the code, step through execution, and understand what's happening. PostForge is modular and approachable — each operator category lives in its own file, the type system is clean, and there's an interactive prompt where you can poke at the interpreter state. Some technical highlights: - Full Level 2 compliance with selected Level 3 features - PDF output with Type 1 font reconstruction/subsetting and TrueType/CID embedding - ICC color management (sRGB, CMYK...
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Show HN: Trust Protocols for Anthropic/OpenAI/Gemini https://ift.tt/zR0FVvl

Show HN: Trust Protocols for Anthropic/OpenAI/Gemini Much of my work right now involves complex, long-running, multi-agentic teams of agents. I kept running into the same problem: “How do I keep these guys in line?” Rules weren’t cutting it, and we needed a scalable, agentic-native STANDARD I could count on. There wasn’t one. So I built one. Here are two open-source protocols that extend A2A, granting AI agents behavioral contracts and runtime integrity monitoring: - Agent Alignment Protocol (AAP): What an agent can do / has done. - Agent Integrity Protocol (AIP): What an agent is thinking about doing / is allowed to do. The problem: AI agents make autonomous decisions but have no standard way to declare what they're allowed to do, prove they're doing it, or detect when they've drifted. Observability tools tell you what happened. These protocols tell you whether what happened was okay. Here's a concrete example. Say you have an agent who handles customer support tickets...
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Show HN: LockFS https://ift.tt/Sgrzp1T

Show HN: LockFS LockFS is a small open-source Java tool that encrypts files individually instead of bundling everything into a single container. Many vault systems rely on large encrypted blobs or container files. They can become complex to handle as they grow and complicate backups across mixed storage sizes. LockFS takes a file-level approach: - Each file is encrypted independently - No monolithic container growth - Files can be added, moved, or removed without rewriting a large archive Contributions and feedback are welcome. https://ift.tt/TM6Bs98 February 18, 2026 at 11:42PM
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Show HN: I wrote a technical history book on Lisp https://ift.tt/h6yXe4q

Show HN: I wrote a technical history book on Lisp The book page links to a blog post that explains how I got about it (and has a link to sample content), but the TL&DR is that I could not find a lot of books that were on "our" history _and_ were larded with technical details. So I set about writing one, and some five years later I'm happy to share the result. I think it's one of the few "computer history" books that has tons of code, but correct me if I'm wrong (I wrote this both to tell a story and to learn :-)). My favorite languages are Smalltalk and Lisp, but as an Emacs user, I've been using the latter for much longer and for my current projects, Common Lisp is a better fit, so I call myself "a Lisp-er" these days. If people like what I did, I do have plans to write some more (but probably only after I retire, writing next to a full-time job is heard). Maybe on Smalltalk, maybe on computer networks - two topics close to my heart. A...
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Show HN: AsdPrompt – Vimium-style keyboard navigation for AI chat responses https://ift.tt/1wNCyz9

Show HN: AsdPrompt – Vimium-style keyboard navigation for AI chat responses I use Claude throughout the day and kept getting annoyed by the same thing: selecting text from responses with the mouse. Overshoot, re-select, copy, click input, paste. Especially bad in long conversations where you want to reference something from 30 turns ago. asdPrompt is a Chrome extension that adds hint-based navigation (like Vimium) to AI chat interfaces. Cmd+Shift+S activates the overlay, hint labels appear next to every text block. Type a letter to select a block, then keep typing to drill down: block → sentence → word. Enter copies, or you can press an action key (e, d, x) to inject a follow-up prompt ("elaborate on [selection]") directly into the chat input. Works on claude.ai, chatgpt.com, and gemini.google.com. Adapts to light/dark themes. Free. Built the initial MVP in 2 days using Claude Code — the adapter architecture, NLP segmentation pipeline, and Playwright test harness would have t...
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Show HN: Claude-engram – Brain-inspired persistent memory, runs inside Claude.ai https://ift.tt/IDxTsMl

Show HN: Claude-engram – Brain-inspired persistent memory, runs inside Claude.ai Claude.ai artifacts can call the Anthropic API and have persistent storage (5MB via window.storage). I used these two capabilities to build a memory system modeled on how human memory actually works — salience scoring, forgetting curves, and sleep consolidation — all running inside a single React artifact with no external dependencies. Just add artifact to your chat and paste instructions into your personal preferences setting. https://ift.tt/F52iBTH February 17, 2026 at 12:15AM
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