🛠️ All DevTools

[Other] A Git helper tool that breaks large merges into parallelizable tasks

[Database] Show HN: Rekal – Long-term memory for LLMs in a single SQLite file I got tired of repeating myself to my LLM every session. rekal is an MCP server that stores memories in SQLite and retrieves them with hybrid search (BM25 + vectors + recency decay). One file, local embeddings, no API keys.

[CLI Tool] I ran Gemma 4 as a local model in Codex CLI

[Database] Show HN: T4 – a versioned datastore with branching and time-travel (S3-backed) Hi HN,<p>I built t4, a datastore that stores its WAL and snapshots in S3.<p>Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL.<p>A side effect of this model is that the database becomes naturally versioned: you can restore any past state, branch from any point (with copy-on-write) and replay history<p>I started this as an experiment to replace etcd in Kubernetes, but it’s evolving into a general-purpose versioned state store.<p>Curious what people think about it and appreciate any feedback!

[CLI Tool] Show HN: Claudraband – Claude Code for the Power User Hello everyone.<p>Claudraband wraps a Claude Code TUI in a controlled terminal to enable extended workflows. It uses tmux for visible controlled sessions or xterm.js for headless sessions (a little slower), but everything is mediated by an actual Claude Code TUI.<p>One example of a workflow I use now is having my current Claude Code interrogate older sessions for certain decisions it made: <a href="https:&#x2F;&#x2F;github.com&#x2F;halfwhey&#x2F;claudraband?tab=readme-ov-file#self-interrogation" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;halfwhey&#x2F;claudraband?tab=readme-ov-file#s...</a><p>This project provides:<p>- Resumable non-interactive workflows. Essentially `claude -p` with session support: `cband continue &lt;session-id&gt; &#x27;what was the result of the research?&#x27;` - HTTP server to remotely control a Claude Code session: `cband serve --port 8123` - ACP server to use with alternative frontends such as Zed or Toad (<a href="https:&#x2F;&#x2F;github.com&#x2F;batrachianai&#x2F;toad" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;batrachianai&#x2F;toad</a>): `cband acp --model haiku`. - TypeScript library so you can integrate these workflows into your own application.<p>This exists cause I was using `tmux send-keys` heavily in a lot of my Claude Code workflows, but I wanted to streamline it.

[Other] My adventure in designing API keys

[Other] The open-source managed agents platform. Turn coding agents into real teammates — assign tasks, track progress, compound skills.

[Other] Show HN: Git why – log your agent reasoning trace along your code I was frustrated with not being able to know why the code written by my colleague agents was in the codebase, so I build a tool to version agent trace along code in git.

[Other] How to build a `Git diff` driver

[Other] Show HN: Docker-whisper: Self-hosted Whisper speech-to-text server (OpenAI API)

[Other] Advanced Mac Substitute is an API-level reimplementation of 1980s-era Mac OS

[CLI Tool] Show HN: Waffle – Native macOS terminal that auto-tiles sessions into a grid Hi HN. I built Waffle because I kept ending up with 15 terminal windows scattered across three spaces with no idea what was running where.<p>Splitting&#x2F;merging in iTerm kind of works but it never felt intuitive to me.<p>With that in mind, I built something to suit my workflow:<p>Waffle is a native macOS terminal (Built on Miguel de Icaza&#x27;s SwiftTerm) that tiles your sessions into an auto-scaling grid automatically. 1 session is fullscreen, 2 is side by side, 4 is 2x2, 9 is 3x3. Open a terminal, it joins the grid. Close one, the grid rebalances. No splitting, no config.<p>I&#x27;ve been using it a lot recently and one thing I&#x27;ve found really useful is that sessions detect which repo they&#x27;re in and group accordingly. Each project gets a distinct colour. Cmd+[ and Cmd+] flip between groups. If you have three repos open across eight terminals, you can filter to just one project&#x27;s sessions instantly. Also, no accidentally closing a window with CMD-W as it gives you a confirmation and requires a second CMD-W to close.<p>Honestly, if you live in tmux, this probably isn&#x27;t for you but it&#x27;s really helped to speed up my workflow.<p>Other things: It comes with a handful of themes (and has support for iTerm themes), bundled JetBrains mono, has keyboard shortcuts for everything. Free, no account, opt-in analytics only. macOS 14+.<p>There&#x27;s a demo on the landing page if you want to see it in action.

[Other] Show HN: I rebuilt a 2000s browser strategy game on Cloudflare's edge I grew up in Germany in the early 2000s playing a browser game called Inselkampf. You built up an island, mined gold and stone, cut down trees for wood, raised armies, sent fleets across an ocean grid, joined alliances and got betrayed by them. Same genre as OGame or Travian. It shut down in 2014 and I never found anything that replaced that feeling of checking in before school to see if your fleet had arrived and your alliance was still alive.<p>I finally built the version I wanted to play. Kampfinsel is live at kampfinsel.com right now with real players on it. It&#x27;s not a straight copy of the old game. I gave it its own world. No magic, no gunpowder – just ballistas, fire pots, and slow ships crossing huge distances. Three resources: gold, stone, wood. Travel between islands takes hours, not seconds. It&#x27;s slow on purpose.<p>The whole thing runs on Cloudflare&#x27;s edge. Workers for the game logic and API, D1 for the database, KV for sessions and caching, R2 for assets and Durable Objects for per-island state and the tick system (fleet arrivals, combat, resource generation). There&#x27;s no origin server at all. Making a stateful multiplayer game work inside Workers&#x27; CPU limits and D1&#x27;s consistency model meant some non-obvious choices: resources are calculated on-read from timestamps instead of being ticked into the database, fleet movements live in Durable Object alarms and combat writes are batched. This helped me a lot!<p>The look is intentionally rough and text-heavy (Hi HN!): server-rendered HTML, tables, a parchment color palette, Unicode icons, no frontend framework, no build step. The only JavaScript is for countdown timers and auto-refresh. I wanted it to feel the way I remember these games looking, not how they actually looked. Honestly, it looks a lot like HN itself - tables, monospace, no chrome. If you like how this site looks, you&#x27;ll probably feel at home.<p>No signup wall, no premium currency, no pay-to-win. Feedback very welcome, especially from anyone who played this kind of game back in the day or has opinions on running stateful stuff on Workers + D1 + Durable Objects. I&#x27;ll be around for the next few hours.

[Other] What We Learned Building a Rust Runtime for TypeScript

[Other] practice made claude perfect

[Other] A single CLAUDE.md file to improve Claude Code behavior, derived from Andrej Karpathy's observations on LLM coding pitfalls.

[Other] Show HN: A WYSIWYG word processor in Python Hi all,<p>Finding a good data structure for a word processor is a difficult problem. My notebook diaries on the problem go back 25 years when I was frustrated with using Word for my diploma thesis - it was slow and unstable at that time. I ended up getting pretty hooked on the problem.<p>Right now I’m taking a professional break and decided to finally use the time to push these ideas further, and build MiniWord — a WYSIWYG word processor in Python.<p>My goal is to have a native, non-HTML-based editor that stays simple, fast, and is hackable. So far I am focusing on getting the fundamentals right. What is working yet is:<p>- Real WYSIWYG editing (no HTML layer, no embedded browser) with styles, images and tables.<p>- Clean, simple file format (human-readable, diff-friendly, git-friendly, AI-friendly)<p>- Markdown support<p>- Support for Python-plugins<p><i>Things that I found:</i><p>- B-tree structures are perfect for holding rich text data<p>- A simple text-based file format is incredibly useful — you can diff documents, version them, and even process them with AI tools quite naturally<p><i>What I’d love feedback on:</i><p>- Where do you see real use cases for something like this?<p>- What would be missing for you to take it seriously as a tool or platform?<p>- What kinds of plugins or extensions would actually be worth building?<p>Happy about any thoughts — positive or critical. Greetings

[Other] Show HN: FluidCAD – Parametric CAD with JavaScript Hello HN users,<p>This is a CAD by code project I have been working on on my free time for more than year now.<p>I built it with 3 goals in mind:<p>- It should be familiar to CAD designers who have used other programs. Same workflow, same terminology.<p>- Reduce the mental effort required to create models as much as possible. This is achieved by:<p><pre><code> - Provide live rendering and visual guidance as you type. - Allow the user to reference existing edges&#x2F;faces on the scene instead of having to calculate everything. - Provide interactive mouse helpers for features that are hard to write by code: Only 3 interactive modes for now: Edge trimming, Sketch region extrude, Bezier curve drawing. - Implicit coding whenever possible: e.g: There are sensible defaults for most parameters. The program will automatically fuse intersecting objects together so you do not have to worry about what object needs to be fused with what.</code></pre> - It should be reasonably fast: The scene objects are cached and only the updated objects are re-computed.<p>I think I have achieved these goals to a good extent. The program is still in early stages and there are many features I want to add, rewrite but I think it is already usable for simple models.<p>Update to add more details: This is based on Opencascade.js WASM binding. So you get all the good things that come with any brep kernel. Fillets, chamfers, step import and export...<p>The scene is webview but the editing is in your local file. You use your own editor and the environment you are familiar with.<p>One important feature that I think make this stand out among other code based cad software is the ability to transform features not just shapes. More here: <a href="https:&#x2F;&#x2F;fluidcad.io&#x2F;docs&#x2F;guides&#x2F;patterns" rel="nofollow">https:&#x2F;&#x2F;fluidcad.io&#x2F;docs&#x2F;guides&#x2F;patterns</a> You can see it in action in the lantern example: <a href="https:&#x2F;&#x2F;fluidcad.io&#x2F;docs&#x2F;tutorials&#x2F;lantern" rel="nofollow">https:&#x2F;&#x2F;fluidcad.io&#x2F;docs&#x2F;tutorials&#x2F;lantern</a>

[Other] JSON Formatter Chrome Plugin Now Closed and Injecting Adware

[Other] Show HN: I run AI background removal in the browser–no upload,no server RMBG-1.4 + SAM running client-side via ONNX Runtime WASM. ~2s on laptop, works on mobile. Your image never leaves the browser.<p>Built this as part of allplix.com. 19yo student in France, solo project.<p>Happy to talk about the WASM pipeline or the pain of running ML models in a browser tab.