Show HN: AI Subroutines – Run automation scripts inside your browser tab https://ift.tt/nfGk4aK

Show HN: AI Subroutines – Run automation scripts inside your browser tab We built AI Subroutines in rtrvr.ai. Record a browser task once, save it as a callable tool, replay it at: zero token cost, zero LLM inference delay, and zero mistakes. The subroutine itself is a deterministic script composed of discovered network calls hitting the site's backend as well as page interactions like click/type/find. The key architectural decision: the script executes inside the webpage itself, not through a proxy, not in a headless worker, not out of process. The script dispatches requests from the tab's execution context, so auth, CSRF, TLS session, and signed headers get added to all requests and propagate for free. No certificate installation, no TLS fingerprint modification, no separate auth stack to maintain. During recording, the extension intercepts network requests (MAIN-world fetch/XHR patch + webRequest fallback). We score and trim ~300 requests down to ~5 based on method, timing relative to DOM events, and origin. Volatile GraphQL operation IDs are detected and force a DOM-only fallback before they break silently on the next run. The generated code combines network calls with DOM actions (click, type, find) in the same function via an rtrvr.* helper namespace. Point the agent at a spreadsheet of 500 rows and with just one LLM call parameters are assigned and 500 Subroutines kicked off. Key use cases: - record sending IG DM, then have reusable and callable routine to send DMs at zero token cost - create routine getting latest products in site catalog, call it to get thousands of products via direct graphql queries - setup routine to file EHR form based on parameters to the tool, AI infers parameters from current page context and calls tool - reuse routine daily to sync outbound messages on LinkedIn/Slack/Gmail to a CRM using a MCP server We see the fundamental reason that browser agents haven't taken off is that for repetitive tasks going through the inference loop is unnecessary. Better to just record once, and get the LLM to generate a script leveraging all the possible ways to interact with a site and the wider web like directly calling backed API's, interacting with the DOM, and calling 3P tools/APIs/MCP servers. https://ift.tt/PQMo5tl April 18, 2026 at 02:33AM

Show HN: Praxis – Lab data to publication-ready figures in one Python package https://ift.tt/CgwOGbo

Show HN: Praxis – Lab data to publication-ready figures in one Python package https://ift.tt/Xj84lVx April 18, 2026 at 11:45PM

Show HN: I turned my MacBook notch into a live Claude Code dashboard https://ift.tt/7fTxpgh

Show HN: I turned my MacBook notch into a live Claude Code dashboard https://ift.tt/7vcBalI April 17, 2026 at 09:13PM

Show HN: web-pinentry: a pinentry program that leverages matrix and http https://ift.tt/S5TBsZY

Show HN: web-pinentry: a pinentry program that leverages matrix and http I made this tool that allows server admins to decrypt passwords during bootup with the help of Matrix and HTTP. https://ift.tt/ixsrW8m April 18, 2026 at 12:32AM

Show HN: Smol machines – subsecond coldstart, portable virtual machines https://ift.tt/RITwf1v

Show HN: Smol machines – subsecond coldstart, portable virtual machines https://ift.tt/0rnBWbq April 17, 2026 at 10:48PM

Show HN: Tracking Top US Science Olympiad Alumni over Last 25 Years https://ift.tt/8raBJeo

Show HN: Tracking Top US Science Olympiad Alumni over Last 25 Years Interesting to see that the entrepreneurs from more recent years tend to be doing well relative to years prior. Some interesting future directions could be: - Expanding search to be global and include more competitions, like biology and chemistry - Improving search so less unknown results - Showing insights, like trends over the years Kudos to Perplexity Computer for making this https://ift.tt/8oKSknx April 17, 2026 at 03:32AM

Show HN: Marky – A lightweight Markdown viewer for agentic coding https://ift.tt/XBMI3co

Show HN: Marky – A lightweight Markdown viewer for agentic coding Hey HN, In this age of agentic coding I've found myself spending a lot of time reviewing markdown files. Whether it's plans or documentation that I've asked my agent to generate for me, it seems that I spend more time reading markdown than code. I've tried a few different solutions to make it easier to read such as Obsidian however I've found their Vault system to be quite limiting for this use case and I've found TUI solutions to not quite be as friendly to read as I've wanted so I made Marky. Marky is a lightweight desktop application that makes it incredibly easy to read and track your markdown files. It also has a helpful cli so you can just run marky FILENAME and have the app open to the md file that you pointed it at. I've been using the daily over the past week and I really enjoy it so I figured I'd share it. Here's a video if you want to check out a demo: https://www.youtube.com/watch?v=nGBxt8uOVjc . I have plans to add more features such as incorporating agentic tools such as claude code and codex into the UI as well as developing a local git diff reviewer to allow me to do local code review before pushing up to git. I'd love to hear your thoughts and any feature suggestions you may have :) https://ift.tt/R7rgG3q April 16, 2026 at 09:38PM