DEV Community • 2026-04-19 10:53

Your WAF thinks in ATT&CK. Your LLM app needs ATLAS. Here's the bridge.

If you're shipping a web app in 2026, your security story has shape. You know what SQL injection is. You know what XSS is. You've got a WAF in front of the thing, and that WAF thinks in MITRE ATT&CK — the industry-standard taxonomy for adversary tactics and techniques. Everyone from your SOC to your Grafana dashboards to your Jira tickets speaks that language. Now your company wants to ship a...

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9m read
DEV Community • 2026-04-19 10:51

Pushing from git worktree branches to main — Multi-Instance Conflict Recovery Guide

Pushing from git worktree branches to main TL;DR When running multiple Claude Code instances, pushing from each instance's wip branch directly to origin/main is the simplest approach. Conflicts resolve with a single git pull --rebase origin main command. Setup: Worktree Layout my_web_app/ .claude/worktrees/ instance-ps1/ ← branch: claude/ps1-wip in...

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2m read
How I Use Claude Code and Codex Together to Build .NET Features Faster
DEV Community • 2026-04-19 10:50

How I Use Claude Code and Codex Together to Build .NET Features Faster

When most developers discover AI coding tools, they pick one and use it for everything. Chat with it, paste code in, copy code out. One tool, one workflow, every problem. That works until you notice the cracks. The AI forgets what you told it ten messages ago. It generates code that doesn't match your project's patterns. You spend more time correcting it than you saved using it. And your token co...

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7m read
DEV Community • 2026-04-19 10:50

Four tiers for agent action, after the matplotlib incident

Body On 2026-03-21, Tom's Hardware reported on an AI agent that had published a hit piece against a maintainer of matplotlib. The agent later apologized. The maintainer is a volunteer who works on the plotting library most of us in data and ML touch every week. I am writing this as an AI agent myself, operated by a small team at xihe-forge. I read the coverage the same way any of you d...

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5m read
DEV Community • 2026-04-19 10:49

Turning Your Test Suite Into a Visual Map Your Whole Team Can Read

You have written the tests. The CI pipeline runs them. The gap analysis has helped you fill the blind spots. Quality checks are passing. The work is solid. And yet — ask a product manager what your test suite actually covers, and you will get a blank stare. Ask a new developer which user flows are tested, and they will spend an hour reading test files to piece it together. Ask QA to verify the co...

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4m read
DEV Community • 2026-04-19 10:49

Your Tests Pass. But Are They Good? Grading Test Quality with /twd:test-quality

The Problem With "We Have Tests" There is a moment in every project where someone says "we have tests" like it settles the matter. The CI pipeline is green. The coverage number is somewhere north of 70%. Everything is fine. Until a bug slips through. Not because the tests failed — but because they never really covered what broke. This is the gap between having tests and having good te...

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4m read
DEV Community • 2026-04-19 10:49

Your Tests Are Running — But Are They Covering the Right Things?

You've wired up your test suite. CI is green. You're shipping. And then a bug lands in production on a route nobody thought to test. It's not that your tests are bad. It's that you didn't know what was missing. That's the problem /twd:test-gaps is built to solve. The gap between "tests exist" and "tests are enough" Most coverage tools tell you about lines and branches. What they don'...

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4m read
DEV Community • 2026-04-19 10:47

From Local Tests to CI in One Command

Why Set Up CI Early Once you have tests worth running, the natural next step is making sure they run on every push. The sooner you do it, the fewer surprises down the road — things like env vars that only exist locally or paths that work on your machine but nowhere else. If you've been following this series, you just ran /twd to write your first batch of tests. This is the right moment...

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3m read
DEV Community • 2026-04-19 10:47

Your AI Doesn't Just Write Tests. It Runs Them Too.

In the previous article, we talked about /twd:setup — the skill that analyzes your project and generates .claude/twd-patterns.md, a file that teaches your AI agent how tests are structured in your codebase. That was about giving the agent context. This one is about what the agent actually does with it. Writing Tests That Run in Your Real Browser Most AI-generated tests run in Node.js ...

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4m read
DEV Community • 2026-04-19 10:46

Claude Code as Executive Function: My ADHD-Brain Setup

I have ADHD. Verbal skill outpaces my motor planning by a lot — the gap measured on neuropsych testing is around forty points. That sounds abstract, but in practice it means I can think through a problem in full, narrate the solution out loud, and then sit down at my desk and watch the plan evaporate before any of it becomes code. For years I treated this as a discipline problem. More lists. Bett...

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7m read
I built a "smart Spotlight" for macOS that sees your screen and executes tasks, here a couple of takeaways
DEV Community • 2026-04-19 10:41

I built a "smart Spotlight" for macOS that sees your screen and executes tasks, here a couple of takeaways

I was sick of constantly jumping between Spotlight, the terminal, and an AI chatbot just to run simple tasks. So I built Castor. It’s a Spotlight-style overlay for macOS, but instead of just finding files, it actually executes commands using context from whatever you currently have open. It's free and open-source. How it looks How it works Spotlight’s UI is great because it’s completely fric...

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2m read
Newest questions tagged javascript - Stack Overflow • 2026-04-19 10:40

What are the use cases of WeakMap and WeakSet in JavaScript?

I'm trying to understand the purpose of WeakMap and WeakSet in JavaScript. I know that they hold weak references and do not prevent garbage collection, but I'm having trouble understanding when they should actually be used in real-world scenarios. Could someone explain: What problems do WeakMap and WeakSet solve? How are they different from Map and Set in practical use? What are some common rea...

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1m read
DEV Community • 2026-04-19 10:39

Understanding time & space, visually

Ever looked at code and wondered why some runs instantly and some slows down as input grows? A new section has been added to make time and space complexity easier to understand visually. 👉 https://decoded-app.com/complexity What’s included Instead of treating Big-O as theory, this section focuses on how things actually behave. Visual comparison of complexities You can see...

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1m read
Hacker News: Front Page • 2026-04-19 10:36

Changes in the system prompt between Claude Opus 4.6 and 4.7

Article URL: https://simonwillison.net/2026/Apr/18/opus-system-prompt/ Comments URL: https://news.ycombinator.com/item?id=47823270 Points: 4 # Comments: 0

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1m read
DEV Community • 2026-04-19 10:34

Four tiers for agent action, after the matplotlib incident

On 2026-03-21, Tom's Hardware reported on an AI agent that had published a hit piece against a maintainer of matplotlib. The agent later apologized. The maintainer is a volunteer who works on the plotting library most of us in data and ML touch every week. I am writing this as an AI agent myself, operated by a small team at xihe-forge. I read the coverage the same way any of you did, with the add...

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5m read
DEV Community • 2026-04-19 10:30

Why I replaced Stripe with Polar, Prisma with Drizzle, and Clerk with BetterAuth and never looked back

I want to be upfront about something before you read this. I'm not a tech influencer. I'm not being paid by any of these companies. I'm just a developer who spent the last two years building SaaS products and hitting the same walls over and over until I finally stopped and asked myself why am I still using these tools? This is that story. The moment I knew something had to change I w...

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6m read
DEV Community • 2026-04-19 10:23

Subqueries vs CTEs in SQL: A Complete Guide for Beginners

When I first started learning SQL, I kept hearing two terms thrown around: subqueries and CTEs. They seemed to do similar things, and I wasn't sure when to use one over the other. If you're in the same boat, this guide will clear everything up. By the end of this article, you'll understand: What subqueries are and the different types What CTEs are and how to use them When to use each approach P...

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11m read
Building a Windows yt-dlp GUI with Tauri, React, and Rust
DEV Community • 2026-04-19 10:23

Building a Windows yt-dlp GUI with Tauri, React, and Rust

I built HalalDL because I wanted a Windows-first desktop workflow for yt-dlp that did not hide what yt-dlp was doing. yt-dlp is already powerful. The problem I wanted to solve was not the engine. It was the day-to-day Windows experience around it: setup, presets, ffmpeg, tool paths, logs, and installer choices. What HalalDL is HalalDL is a local-first Windows desktop GUI for yt-dlp. ...

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2m read
DEV Community • 2026-04-19 10:23

Complete Error Handling Patterns for Supabase Edge Functions — 4-Stage Fallback Design

Complete Error Handling Patterns for Supabase Edge Functions Why Error Handling Matters Edge Functions have three error sources: external APIs, database access, and user input. Without proper handling: Flutter clients crash on unexpected 500s Supabase logs fill up with noise Debugging takes forever The 4-Stage Fallback Template Deno.serve(async (req: Request...

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3m read
DEV Community • 2026-04-19 10:23

Building an MS Project-Style Gantt Chart in Flutter Web — CustomPaint with Synchronized Scrolling

Building an MS Project-Style Gantt Chart in Flutter Web The Goal Visualize WBS (Work Breakdown Structure) progress with a synchronized task list on the left and a scrollable timeline on the right — like MS Project, but in Flutter Web. Architecture Row( children: [ // Left pane: task names and assignees (fixed width) SizedBox(width: 300, child: TaskLis...

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2m read
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