2025年7月3日 の Show HN

TLDR: Build a quick HN profile to see how little context LLMs need to personalise your feed. Rate 30 posts once, get a permanent ranked homepage you can return to.

Our goal was to build a tool that allowed us to test a range of "personal contexts" on a very focused everyday use case for us, reading HN!

We are exploring use of personal context with LLMs, specifically what kind of data, how much, and with how much additional effort on the user’s part was needed to get decent results. The test tool was a bit of fun on its own so we re-skinned it and decided to post it here.

First time posting anything on HN but folks at work encouraged me to drop a link. Keen on feedback or other interesting projects thinking about bootstrapping personal context for LLM workflows!

Hi HN, these last couple of weeks I've been building 'Recivo', a simple way to receive emails programmatically. There are plenty of API-based services that can be used to send emails, but receiving them is harder.

As a Recivo user, you create a new email address which will then immediately be available for receiving emails. A REST `/inbox` endpoint is exposed for retrieving these emails, this includes all data you would expect: subject, content, sender, and most importantly: attachments. You can also get notified of newly received emails using webhooks.

The main use-cases I'm thinking of right now is triggering AI agents using email or a very simple document upload flow to any SaaS (just forward an email to the SaaS). This is actually where the inspiration for Recivo came from, I really enjoy the flow of getting an invoice in my mailbox and forwarding it to my accounting software and then seeing it appear in the app. The agentic use-case seems promising, especially for workflows that still require a human in the loop. Asynchronous communication with an AI agent feels natural to me.

When you visit the landing page you're immediately given a randomly generated email address and a cURL command to try the API. Of course these demo addresses will expire, so you'll have to log in to create a non-randomized and permanent address.

I'm wondering if you see any other use cases for a "programmatic" mailbox. Please let me know what you think!

Around three years ago, I was reminiscing about how much I loved playing Neopets as a kid. Meanwhile, I was also looking for a project to better learn Rust and SolidJS. So.. I figured making my own virtual pet browser game would be a fun way to practice! Since then, I’ve been working on it nearly every day, and.. it’s grown quite a bit! Here are some bulleted lists for your convenience:

Technical Details:

  * Backend monolithic Rust server runs on a single $5/month VPS

  * Lean frontend with just 3 dependencies (SolidJS, Solid Router, and Mutative)

  * Around 130,000 combined lines of code (frontend + backend)

  * Rust server uses axum, sqlx, tokio, rand, strum, tungstenite (websockets)

  * No server crashes or data loss in 3 years (thank you Rust + Postgres!)

  * Almost all graphics (500+ assets) are SVGs for perfect detail at every zoom level

  * Fully mobile responsive and playable on all modern browsers and devices

  * Actor model for player actions enables trivial parallel, multi-core scaling

  * Single page application that preloads entire game world on initial page load

  * Instantaneous navigation between pages (no additional page fetches required)

  * Lightweight game engine for minigames, powered by custom WebGL shaders

  * Rust is the single source of truth for data structures shared between browser and server

  * Custom derive macros used to autogenerate TypeScript bindings and binary decoding functions

  * Binary WebSocket messages with custom protocol for client-server communication

  * O(1) selection for nested, weighted-random item reward pools

  * Minigames can be played without an account (but rewards can't be saved)

Features:

  * Completely free to play with no ads or tracking

  * Multiplayer browser-based virtual world with 80+ locations to explore

  * Dark mode toggle switch

  * Simple minigames that smoothly run at your display's refresh rate

  * Public leaderboards that track the top scores in each minigame

  * Pet training system with turn-based card-based battle arena

  * Dynamic player economy with player-run shops

  * Player guilds that members can level up to unlock perks

  * Abandoned mines area created by maze generation algorithm

  * Create / adopt pets, adorn them with hats, give them pets, change their color, etc.

  * 220 items to collect (food, toys, cosmetics, books, charms, tiny creatures, etc.)

  * In-game currency with banking, auctions, stock market, and jobs system

  * Villagers you can talk to, befriend, and complete quests and jobs for

  * Optional push notifications (like for when you win an auction)

  * 38 achievement avatars to unlock

  * Social features: befriend others, send gifts, and share your recent activity

  * NPC shops that restock over time (sometimes with very rare items!)

  * Luck system with ways to boost your luck for better rewards

  * Many puzzles that grant items or MP (currency) when solved

  * Fishing, gardening, caves, random events, fountains, galleries, etc.

  * Wheels to spin, treasure maps to complete, and secrets to explore!

  * Much, much more but I don't want to spoil everything!

Links:

  * Website URL: https://mochia.net

  * Community Discord: https://discord.gg/ub6z8YH866

  * Gameplay Video: https://www.youtube.com/watch?v=CC6beIxLq8Q

  * Screenshots Album: https://imgur.com/a/FC9f9u3

I'd love to answer any questions, hear any thoughts, or read any sort of feedback or criticism!