Show HN: Deterministic security solution for AI agents – OpenClaw and 2 more https://ift.tt/UH9dJ5f

Show HN: Deterministic security solution for AI agents – OpenClaw and 2 more I wanted to share a solution that I made initially for myself for OpenClaw, that helps control what your ai agents can reach when you let it do stuff without impacting its power, I hope it's useful to you. Basically the solution lets you experiment freely with your agent within safe boundaries. It's deterministic on purpose (doesn't include any Al layer) which means the solution follows clear and already defined rules, to maximize safety/security and predictability. Rules are heavily tested on detecting prompt injection attempts and other security cases (explained in detail in the docs). Everything is local and lives on your computer including the docs site. It gives you a control panel to monitor and control boundaries. When boundaries are about to get crossed you receive an approval request which lets you see what your openclaw was trying to do. It also (currently) supports Tailscale, so you can connect your Tailscale IP address and receive everything on your phone and you can also chat normally, approve or deny requests. It lets access the control panel via your tailscale IP address (a private one is recommended) from anywhere. Currently only Telegram Channel is supported. Only supports linux os for now and Opencode Claude Code & OpenClaw runners. The things you need to get started are explained in the readme, also include quick demo/showcase images so you can see how it looks. I'll be happy to hear feedback from you guys, especially having it tested against prompt injections to see how it handles it, don't hesitate to open a ticket on the GitHub for any issue that you found, I'll do my best to fix them. Link here: https://ift.tt/v2K8Hws Thank you for reading. I'll be happy to discuss about it. March 21, 2026 at 10:43AM

Show HN: I fixed FFmpeg's subtitle conversion (the bug from 2014) https://ift.tt/CwTYN29

Show HN: I fixed FFmpeg's subtitle conversion (the bug from 2014) FFmpeg converts everything except subtitles across format boundaries. SRT to Blu-ray PGS? "Subtitle encoding currently only possible from text to text or bitmap to bitmap." Ticket #3819, filed 2014. I built this with Claude Code over a few weeks. Claude wrote most of the encoder, found an integer overflow in the decoder buffer tracking, and ran review from five angles. I read the Panasonic and Sony patents, made the architectural calls, and told it when it was wrong about the spec. We argued about whether DTS computation belongs in the muxer. (It does, and also in fftools. We did both.) Animation is an interesting problem. Advanced SubStation Alpha fades have to survive conversion to Blu-ray's PGS format. The encoder watches pixel changes between frames and classifies them: palette shift or full redraw. Fades become palette-only updates, no bitmap retransmission. Overlapping subtitles with different end times took four rewrites and an event lookahead window. I'd like to maintain this properly and get the patches upstream eventually. If you hit a bug or have a subtitle workflow that doesn't work, open an issue. I'm dead curious what people do with this, but i have some plans for translation related plugins building on the OCR work. Six iterations. 23 patches. libass and Tesseract were already in FFmpeg's filter library. I wired them into the main pipeline the same way sub2video works. Text to bitmap, bitmap to text, 114 OCR languages, RGBA-to-GIF. The development page has the history. Pre-built for 6 platforms, no dependencies: https://connollydavid.github.io/pgs-release/ https://connollydavid.github.io/pgs-release/ March 17, 2026 at 01:39PM

Show HN: Korru, Web App Catalog https://ift.tt/kxC6Z9W

Show HN: Korru, Web App Catalog In this release you can now filter by categories. As the vast majority of apps do not specify categories, I will progressively add them manually. https://korru.app March 21, 2026 at 08:34AM

Show HN: Agent-password – a local macOS password manager for agent workflows https://ift.tt/OAExryb

Show HN: Agent-password – a local macOS password manager for agent workflows https://ift.tt/oWJRvrS March 21, 2026 at 01:00AM

Show HN: Sonar – A tiny CLI to see and kill whatever's running on localhost https://ift.tt/IyjeS6Y

Show HN: Sonar – A tiny CLI to see and kill whatever's running on localhost https://ift.tt/hEo02Bf March 20, 2026 at 06:59AM

Show HN: Cybertt – Cybersecurity Tabletop https://ift.tt/vGp9L3A

Show HN: Cybertt – Cybersecurity Tabletop https://cybertt.xyz/ March 20, 2026 at 06:29AM

Show HN: Download entire/partial Substack to ePub for offline reading https://ift.tt/Bjcr0m3

Show HN: Download entire/partial Substack to ePub for offline reading Hi HN, This is a small python app with optional webUI. It is intended to be run locally. It can be run with Docker (cookie autodetection will not work). It allows you to download a single substack, either entirely or partially, and saves the output to an epub file, which can be easily transferred to Kindle or other reading devices. This is admittedly a "vibe coded" app made with Claude Code and a few hours of iterating, but I've already found it very useful for myself. It supports both free and paywalled posts (if you are a paid subscriber to that creator). You can order the entries in the epub by popularity, newest first, or oldest first, and also limit to a specific number of entries, if you don't want all of them. You can either provide your substack.sid cookie manually, or you can have it be autodetected from most browsers/operating systems. https://ift.tt/XYLOufc March 20, 2026 at 12:36AM