Show HN: AI Subroutines – Run automation scripts inside your browser tab https://ift.tt/U4DT1SK

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/50OqDWg April 18, 2026 at 01:03AM

Show HN: WebGL Liminal Space https://ift.tt/y7LlFDA

Show HN: WebGL Liminal Space Fun little liminal space game I made this week learning webGL. https://ift.tt/YPyFgtD https://liminal-dwsw5.ondigitalocean.app/ April 18, 2026 at 09:10PM

Show HN: Mind-OS – First free online AI dependency self‑assessment https://ift.tt/SpGcJ0k

Show HN: Mind-OS – First free online AI dependency self‑assessment https://iamalex-afk.github.io/human-os-patch-33-protocols/ April 18, 2026 at 01:40AM

Show HN: Pyra – a Python toolchain experiment inspired by uv and Bun https://ift.tt/hAziFx6

Show HN: Pyra – a Python toolchain experiment inspired by uv and Bun I’ve been working on Pyra for the past few months and wanted to start sharing it in public. Right now it’s focused on the core package/project management workflow: Python installs, init, add/remove, lockfiles, env sync, and running commands in the managed env. The bigger thing I’m exploring is whether Python could eventually support a more cohesive toolchain story overall, more in the direction of Bun: not just packaging, but maybe over time testing, tasks, notebooks, and other common workflow tools feeling like one system instead of a bunch of separate pieces. It’s still early, and I’m definitely not claiming it’s as mature as uv. I’m mostly sharing it now because I want honest feedback on whether the direction feels interesting or misguided. https://ift.tt/6vVEui9 April 18, 2026 at 01:50AM

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

Show HN: I turned my MacBook notch into a live Claude Code dashboard https://ift.tt/nZfM1lD April 17, 2026 at 07:43PM

Show HN: Free API and widget to look up US representatives https://ift.tt/yvN8Qr7

Show HN: Free API and widget to look up US representatives https://ift.tt/H5Io4tO April 17, 2026 at 04:45AM

Show HN: Spice simulation → oscilloscope → verification with Claude Code https://ift.tt/PnFiGEf

Show HN: Spice simulation → oscilloscope → verification with Claude Code I built MCP servers for my oscilloscope and SPICE simulator so Claude Code can close the loop between simulation and real hardware. https://ift.tt/rezyX0m April 17, 2026 at 04:37AM