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DEV Community · Technology

How I Automated My Manus AI Workflow (And Saved 62%)

My Manus AI workflow used to be: think of task → write prompt → wait → repeat. Now it's: think of task → Credit Optimizer handles the rest. What Changed Automatic model selection: Each prompt gets analyzed for complexity. Simple tasks go to Standard (70% cheaper), complex ones go to Ma...

Rafael Silva 2 days ago

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DEV Community · Technology

How I Built a 1,056-Test Rust CLI in 3 Weeks

ContextZip started as a fork of RTK (Reduce Toolkit). Three weeks later, it was a different tool with 1,056 tests and coverage for 102 CLI command patterns. Here's what building it looked like. Week 1: The Core Filters The first week was ANSI stripping and duplicate detection. ANSI code...

jidonglab 2 days ago

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DEV Community · Technology

The Hidden Cost of AI Agents in 2026

AI agents are getting cheaper per-token, but total costs are rising. Here's why. The Paradox As AI gets better, we use it for more things. My Manus AI usage went from 50 tasks/month to 200+ in 3 months. Even with lower per-task costs, my bill tripled. Where Money Leaks Over...

Rafael Silva 2 days ago

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DEV Community · Technology

88% of AI Agent Failures Have Nothing to Do With the Model

You keep rewriting the prompt. Upgrading the model. Adding more instructions. The agent still gets it wrong. After hundreds of failed traces, I found where the failures actually live. Everyone in AI is waiting for the next model drop. GPT-5 will fix it. Claude 4 will fix it. Gemini Ultra Pro Max wi...

Serhii Panchyshyn 2 days ago

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Hacker News · Technology

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. Comments URL: https://news.ycombinator.com/item?id=47801255 Points: 3 # Comments: 2

_fizz_buzz_ 2 days ago

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DEV Community · Technology

How to Fix Flaky Tests in GitHub Actions

You know the drill: CI goes red, you check the logs, the failure looks unrelated to your changes. You hit re-run. It passes. You merge. And the cycle repeats tomorrow. This guide covers the six most common patterns behind flaky tests in GitHub Actions and gives you concrete fixes for each. Not theo...

Mihir Shinde 2 days ago

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DEV Community · Technology

Como importei 55 milhões de empresas para PostgreSQL em menos de 3 horas

Quando decidi construir o CNPJ Aberto, que é uma plataforma gratuita de consulta de empresas brasileiras, o primeiro desafio foi óbvio: como colocar 55 milhões de registros dentro do PostgreSQL de forma rápida e repetível (a base atualiza todo mês)? Os dados vêm dos Dados Abertos da Receita Federal...

Pedro Parker 2 days ago

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Hacker News · Technology

Starlink outage hit drone tests, exposing Pentagon's growing reliance on SpaceX

Article URL: https://www.reuters.com/business/media-telecom/starlink-outage-hit-drone-tests-exposing-pentagons-growing-reliance-spacex-2026-04-16/ Comments URL: https://news.ycombinator.com/item?id=47801181 Points: 6 # Comments: 0

petethomas 2 days ago

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DEV Community · Technology

OpenClaw and the Boundary Problem

This is a submission for the OpenClaw Writing Challenge. Personal AI is usually sold as convenience. That is the wrong frame. If you want privacy-first, offline health tech to exist without surveillance funding it: sponsor the build → https://paintracker.ca/sponsor The real question is not how...

CrisisCore-Systems 2 days ago

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DEV Community · Technology

AI University: 3-File Pattern to Add Any AI Provider + Offline Fallback Content

AI University: 3-File Pattern to Add Any AI Provider + Offline Fallback Content What Is AI University 自分株式会社 includes "AI University" — a tab-based learning UI for 20+ AI providers (OpenAI, Google, Anthropic, Meta, xAI, Mistral, DeepSeek, etc.): Overview / Models / API...

kanta13jp1 2 days ago

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DEV Community · Technology

SM-2 Spaced Repetition in Deno + Flashcard UI in Flutter Web: Building a Duolingo Competitor

SM-2 Spaced Repetition in Deno + Flashcard UI in Flutter Web What We Built A language learning feature for 自分株式会社 competing with Duolingo and Anki: SM-2 spaced repetition algorithm (server-side in Deno) Flashcard flip UI with progress indicator Vocabulary deck managemen...

kanta13jp1 2 days ago

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DEV Community · Technology

Building a Public Guitar Gallery With 4 Users: Action Extension Pattern + Viral Design

Building a Public Guitar Gallery With 4 Users: Action Extension Pattern + Viral Design Why Build Community Features at 4 Users 自分株式会社 had 4 registered users when this was built. The counterintuitive argument: a discoverable place must exist before sharing behavior can em...

kanta13jp1 2 days ago

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DEV Community · Technology

Travel Planner + Whiteboard + Recipe Manager in Flutter Web: RadioListTile Migration & const Propagation

Travel Planner + Whiteboard + Recipe Manager in Flutter Web What We Shipped Three features in one session for 自分株式会社: Travel Itinerary Planner — competing with Google Travel, TripAdvisor Virtual Whiteboard — competing with Miro, Microsoft Whiteboard Recipe & Meal...

kanta13jp1 2 days ago

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DEV Community · Technology

Notion-Style Team Workspace in Flutter Web: Supabase RLS EXISTS Subquery + Invite Code Pattern

Notion-Style Team Workspace in Flutter Web: Supabase RLS EXISTS Subquery + Invite Code Pattern What We Built A team collaboration layer for 自分株式会社: Team creation with invite codes (8-char alphanumeric) Join via invite code (no email required) Shared notes within a team...

kanta13jp1 2 days ago

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DEV Community · Technology

CVR Tracking by Competitor Comparison Page: StatelessWidget StatefulWidget + unawaited() Pattern

CVR Tracking by Competitor Comparison Page: StatelessWidget → StatefulWidget + unawaited() The Problem 自分株式会社 has 21 competitor comparison pages (/vs-notion, /vs-slack, /vs-moneyforward, etc.). The question we couldn't answer: which comparison page drives the most signups...

kanta13jp1 2 days ago

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DEV Community · Technology

CRM Pipeline + Horse Racing AI in Flutter Web: Lead Scoring Formula & Kanban with LinearProgressIndicator

CRM Pipeline + Horse Racing AI in Flutter Web What We Shipped Two features in one session for 自分株式会社: CRM Sales Pipeline — competing with Salesforce (kanban + AI lead scoring) Horse Racing Predictor — competing with netkeiba (~17M users, AI prediction model)...

kanta13jp1 2 days ago

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DEV Community · Technology

Guitar Recording Auto-Post to X: OAuth 1.0a Server-Side + Twitter Intent Fallback

Guitar Recording → Auto-Post to X: OAuth 1.0a Server-Side + Twitter Intent Fallback The Architecture Flutter UI (guitar_recording_studio_page.dart) └─ _postToX(title, recordingId, isPublic: true) └─ supabase.functions.invoke('guitar-recording-studio', {action: 'shar...

kanta13jp1 2 days ago

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DEV Community · Technology

Next.js 15 Server Actions vs Route Handlers: When to Use Each (I Got This Wrong for 3 Months)

For the first three months I used Next.js 13+ App Router, I defaulted to Route Handlers for everything. Mutations? Route Handler. Form submissions? Route Handler. Deleting a record? Route Handler. I was mentally porting my Express habits into a framework that had evolved past them. Then I rewrote h...

Atlas Whoff 2 days ago

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DEV Community · Technology

Why Your AI Agent Has Root Access to Everything (And How to Fix It in 3 Lines of Python)

I’ve been building AI agents at work and kept running into the same problem: every framework lets agents call any registered tool with zero safety checks. An agent with database access can run DROP TABLE users and nothing stops it. So I built AgentShield-FW, a runtime firewall that intercepts every...

Avinash Amudala 2 days ago

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DEV Community · Technology

Why Your Productivity System is Actually Making You Less Productive

The Reason Why Your “God Tier” Productivity Hack Actually Makes You Unproductive Have we all been there? It feels productive when you have spent 4 hours to create the ultimate Notion dashboard by tagging, creating recurring databases, and color-coding everything. However, the problem here is that y...

Alex 2 days ago

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DEV Community · Technology

Why I stopped writing prompts and started compiling them

I've been building AI-powered tools for a while and I kept hitting the same wall. Not the models — the models are fine. The problem is how we use them. Every interaction with an AI starts from zero. You open a new conversation, paste your system prompt, explain your context, get partway through so...

brainbootdev 2 days ago

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DEV Community · Technology

Spec-Driven, AI-Assisted, Test-Validated — A Practitioner's Account

What made a two-week typesetting library possible, and what the methodology still lacks §0 — Hook Most accounts of AI-assisted development describe tools and workflows. Very few show primary sources: the actual specification documents, the actual errors caught, the actual decisions re...

Kemal Deniz Teket 2 days ago

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DEV Community · Technology

Security and String Interpolation

I've come back to share knowledge again after being in a long hiatus. Though it's more of a "back to the job searching" situation at the moment. I've recently been looking over recent CVEs and thought I'd share some knowledge of a rather common source of vulnerabilities: string interpolation....

Chris White 2 days ago

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DEV Community · Technology

Kiwi-chan Progress Report: Steady Mining!

Kiwi-chan Devlog: The Saga of the Wandering AI (and My Melting GPU) 🧭 Greetings, fellow digital pioneers and pixel wranglers! It's me, your humble tech blogger, back with another peek into the glorious (and sometimes gloriously frustrating) life of Kiwi-chan, our very own autonomous loca...

kiwi_tech 2 days ago

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