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The prompt engineering trap Most developers start with a single prompt. You tell an LLM to "write a technical guide about X," you get a generic result, and then you spend an hour manually editing the hallucinations. This is not a workflow. It is just a faster way to get a bad first draft. When I first tried to automate my technical blog, I thought the solution was a longer prompt. I spent days perfecting a 500 word system instruction. It still failed because the LLM cannot verify its own ...

Also available in Español The Problem Every team inherits a stylesheet like this eventually. Not badly written. Nobody on the original team was careless. Selectors are reasonable. Naming is consistent enough. And still, nobody touches it without dread, because nobody's sure which of its four thousand lines are load-bearing. So the instinct is always the same. Add a new rule. Don't remove the old one — just in case. A new component gets its own selector rather than reusin...

También disponible en English . El problema Cada equipo hereda una hoja de estilos así, tarde o temprano. No está mal escrita. Nadie en el equipo original fue descuidado. Los selectores son razonables. El nombramiento es lo suficientemente consistente. Y aun así, nadie la toca sin miedo, porque nadie está seguro de cuáles de sus cuatro mil líneas son estructurales. Así que el instinto es siempre el mismo. Añadir una regla nueva. No eliminar la vieja — por si acaso. Un com...

If your MCP server exposes a read_file / write_file / list_dir tool, it is one clever prompt away from serving /etc/passwd to whoever controls the model's input. The naive fixes — prefix checks, os.path.normpath , stripping .. — all fail against symlinks and absolute paths. Here is a guard that holds, plus the regression test that keeps it holding. Why the obvious fixes leak # BROKEN 1: prefix check on the raw string if not user_path . startswith ( BASE...

I built an open-source tool called PolicyApprovalGate . It uses local rules to deny commands or require confirmation immediately before Claude Code or Codex CLI runs a Bash command. nobuo-miura / PolicyApprovalGate A rule-based PreToolUse hook for Claude Code and Codex CLI that denies dangerous Bash commands, asks for confirmation on risky ones, and audits every call — no AI/LLM required. P...

I run a Python-only content pipeline. It generates a static site, and it needs to put that site on Cloudflare Pages, unattended, on a schedule. The official way to do that is wrangler . Wrangler is Node. Adding a Node toolchain to a Python service just to copy files to a CDN felt like the wrong trade, so I went the other way: I read what wrangler actually sends over the wire and reimplemented it with http.client and the standard library. It works. It took longer than it should have, bec...

``Frontend Challenge Perfect Landing Submission 🍲🥧 This is a submission for Frontend Challenge - Comfort Food Edition, Perfect Landing . An interactive landing page for vada pav — not a restaurant, not a recipe blog, a love letter to one dish that means something specific to me. Vada pav is comfort food that people from Maharashtra will defend with real conviction — everyone has an opinion about the right ratio of garlic chutney to green, whether onion belongs on it, and which cart doe...

How to Build an SEO-Friendly Website That People Actually Want to Use SEO is often treated as a technical checklist: add keywords, optimize titles, build links, and wait for rankings. But a successful website needs more than search-engine optimization. It needs to be useful to real people. A website can have excellent keywords and still fail if visitors cannot find what they need, the content is difficult to understand, or the pages are slow and frustrating to use. The best approa...

This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry . Project Overview tscircuit lets you describe a printed circuit board in React. You write <resistor name="R1" footprint="0805" /> and the renderer produces real manufacturing output: component placement, copper, silkscreen, a netlist, Gerbers. tscircuit/core is the renderer at the centre of that, so a placement bug there ships into every board anyone exports. I found this o...

Every photo you share online might expose more than you intend — faces of your kids, strangers in the background, license plates, addresses on envelopes, watermarks with your name. I wanted a tool that: Blurs faces automatically Detects text like license plates and watermarks Never uploads my photos anywhere Works on mobile Is 100% free Existing tools either upload to a server (no thanks) or require manual editing. So I built BlurIt — a fully client-side face and text blurring app. ...

Live game economies look chaotic from the outside. Underneath they are usually a short list of multipliers applied in a fixed order. The engineering problem is not how to win the game. It is how you encode the sell formula so a client-side tool stays honest after patches, refuses illegal stacks, and does not silently invent value. This walkthrough uses a compact JavaScript model for a Roblox farming sequel: a power-law weight term, a single mutation seat, a harvest-type keep rule, friend and ...

This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry . Two bugs, one story. A parser that failed on every real call, plus the test that certified it as working for two review rounds. The second one is the one worth reading about. What the code does I was writing adapters for a protocol indexer. Each adapter has a Receipt parser: it receives the on-chain state changes from one transaction and produces a structured outcome, "this account swapped...

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Support has tickets, sales has call recordings, and product has a Slack channel where everything gets buried, so we tried a spreadsheet to pull it together, but it lasted only a couple weeks before everyone stopped updating it. We're on buildbetter now, which pulls calls and tickets into one feed and auto-tags recurring themes, so the monthly review works, though not sure we're getting the most out of it yet. Dovetail came up a lot but felt purpose-built for research teams running proper stu...

My prev attempt lessons: I have an experience from building a b2c saas earlier that pretty much dead now after months of trying everything but validating the idea with my targeted customers. A promise to myself: So I took a promise that I won't start building any product without validating it with my main targeted audience. So my question now how do I validate a product before building it? And how to find the channels where I can I find those audience? My targeted audience: I...

I keep seeing onboarding flows that basically go: Sign up → tell us your role → company size → what do you want to achieve? → invite your team → connect an integration → pick a template → maybe finally use the product And I think we’ve normalized something backwards. The company is getting value before the user is. We get segmentation data. We get their use case. We get an invited teammate. We get an integration connected. Meanwhile the user still hasn’t had a reason to car...

So I have a product called Hawser that I've been building since March and I felt for so long like I might just be wasting my life away working on this thing. Somebody actually paid and this is the craziest feeling and most insanely rewarding feeling I felt in so long. I feel like I've finally done something right and good and now I can continue working on this because I kind of felt sad because I didn't know when this would start paying off but apparently it has started paying off!!!!!!!!! &...

Hey everyone, I'm a student developer who has been doing this for a while now. Last year, I've built and deployed custom web applications for 4 different small/medium-sized business clients, ranging from a POS and internal management systems to a photo studio tracking app with google drive integration. The situation is that I only bill clients for a one-time project deployment and have no recurring revenue streams, only factoring in maintenance if a client requests any monthly backend update...

I have been studying a lot of SaaS launch & product videos recently & I’m curious what actually stands out to founders. There are plenty of beautifully animated videos out there, but I do not think great motion design automatically makes a great product video. I am also sharing some of my motion designs videos here too. The ones I remember usually do a few things really well: They explain the product quickly without overwhelming you The UI is actually easy to follow The ani...

sorry formatting is rlly bad. idk how to make these and i need help making them better

I'm a 20 year old college dropout. While I was in school I felt completely drained, lost in life, and had no idea what direction I was heading. But I've always had a sense of creativity and a drive to build something of my own. I started watching YouTube videos of young entrepreneurs dropping out of school and building million dollar companies. I also started following people on social media making entrepreneurship look effortless. I decided to drop out of school and start building a SaaS prod...

​ Curious what people who run things locally make of this one, because the caveat is doing most of the work. One prompt to an open model on a single desktop machine, and back comes a finished front end with gauges, a temperature bar and sparkline charts. The prompt is legible on screen and it asks for placeholder data, so none of those readings are real. It's a UI, not a monitor. The clip is about forty seconds. The other half is who did the work. The builds people actually download, ...

Anthropic just documented how it works. Two marks, both machine-readable: Text: an imperceptible watermark woven into the words themselves. You can’t see it, and it doesn’t change meaning, quality, or readability. Files (.svg, .png, .jpg): signed provenance metadata on the C2PA open standard, so you can tell if a file’s been tampered with. The watermark is applied at the model level. That means it shows up no matter where the text comes from: the API, Claude, Claude Code, Cowork, Cla...

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