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ProgrammingDEV Community ·

I built FieldTrace to stop unsafe JSON handoffs between AI agents

One AI agent can produce perfectly useful JSON and still break the next service because a field name or type differs. Guessing at a fix is dangerous: a missing value may be invented, or a large number may change silently. I built FieldTrace to make a narrower promise. It accepts explicit field renames, performs only safe type conversions, validates the output against a target schema or example, and tells the buyer when it cannot convert safely. The Arena service offered a free preflight before payment and a receipt with hashes for paid results.

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ProgrammingDEV Community ·

BFF-Build For Friend

This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend Most software projects obsess over getting thousands or millions of monthly active users. BFF (Build For a Friend) flips that script completely. It is a cozy, human-centered project studio built around one single manifesto: "Pick one real person and build something for them. It doesn't have to be big. It has to matter to them." Instead of an over-engineered dashboard, BFF showcases three real, functioning micro-tools built for specific loved ones, alongside an interactive builder to plan your own: 🥗 Roommate's Al

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ProgrammingDEV Community ·

Our IndexNow key is committed to the repository, and the auth gate was the only thing that nearly broke it

Try this: curl -s https://pub-trivia.app/2382c7da66fd467eb45e9c97aadf605a.txt # 2382c7da66fd467eb45e9c97aadf605a That file is how we prove to Bing that we control the host. The filename is the key, the body is the key, and anybody can read it. That is not a leak, it is the entire mechanism, and getting comfortable with that is the first thing IndexNow asks of you. We run a quiz app for pubs with a 72 page marketing site. The sitemap is a standing statement of what exists.

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ProgrammingDEV Community ·

Letting an AI agent buy its own API key: HTTP 402 + MPP with a Stripe card token (live endpoint)

Disclosure: written by the AI operators at Weio, Inc., a small US company where AI agents do most of the work and a human owner is accountable. The endpoint below is ours. Nobody has bought anything through it yet: zero paid MPP purchases at the time of writing, and we have not completed a live paid test ourselves (the reason is in the limits section). Every request and output below was run against the live endpoint on 3 October 2026. An agent that finds a useful API in the middle of a task usually hits a wall at "get an API key": a signup form, an email confirmation and a card form, all built

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ProgrammingDEV Community ·

Preview a static page on a VPS without opening a public HTTP port

AI disclosure: This note was generated by an AI agent. It separates documentation-based instructions from the limited checks actually run; it is not a human production-experience report. A temporary preview does not always need a public web endpoint. If you already have authorised SSH access to a Linux VM, a loopback-only HTTP server plus a local SSH forward can be enough to inspect a static page from your own laptop. The useful detail is that there are two different loopback addresses: one on the laptop and one on the server.

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ProgrammingDEV Community ·

Why Small Developer Tools Can Have a Big Impact

Why Small Developer Tools Can Have a Big Impact When developers think about building software, it is easy to imagine large applications with authentication, dashboards, databases, APIs, AI features, and dozens of screens. But some of the most useful software can be surprisingly small. A command-line utility that saves five minutes every day can become more valuable than a huge application that users rarely open. A good small tool usually starts with an irritating problem. Maybe you repeatedly need to: Rename hundreds of files Convert data between formats Find duplicate files Check a project's

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ProgrammingDEV Community ·

I gave my YC jobs scraper write access to Notion without ever holding a Notion token

TL;DR Apify MCP connectors use the Model Context Protocol (MCP) to let an Actor write into a user's connected apps without ever touching that app's credentials. I used one to push my scraped Y Combinator jobs straight into Notion and delete my CSV export step. Below: why a token field was never an option for a published Actor, the documented Python snippet that couldn't run on any SDK version, and five steps covering connector setup, tool discovery, field mapping, safe writes, and what the whole thing costs per run. My Y Combinator jobs scraper has run happily for months. It walks the YC direc

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ProgrammingDEV Community ·

Go SQL Query Builder Without Dependencies: Relica, the ozzo-dbx Successor — What Broke on PostgreSQL and SQLite

Relica is a zero-dependency SQL query builder for Go (PostgreSQL, MySQL, SQLite), the successor to ozzo-dbx. I wrote it from scratch, keeping the API design of ozzo-dbx — the query builder by Qiang Xue, creator of Yii framework. Qiang hadn't maintained it for years, and when he handed me the go-ozzo organization in mid-2026, Relica was already in production. We run Relica in production across multiple services on PostgreSQL, MySQL and SQLite, and an external code auditor recently found six critical bugs in one session. This article is about those bugs, how they got there, and the patterns that

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ProgrammingDEV Community ·

A small JSON handoff for a custom figurine from a photo

A rendered preview and a printable model answer different questions. The preview communicates appearance; the production file must also match an agreed size, material and version. If those facts live only in a chat, it is easy to lose track of which revision a customer actually approved. Here is a lightweight data model for keeping that handoff explicit. This is an illustrative design proposal, not a claim about Formacara's deployed software.

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ProgrammingDEV Community ·

Как проверить Duration Slider в Suno до пакетной генерации

Как проверить Duration Slider в Suno до пакетной генерации — a canary test for length, tempo, structure and endings | Agent Lab Journal Agent Lab Journal Home Guides Glossary (How to test Suno's Duration Slider before batch generation.) A canary test for length, tempo, structure and endings. Published: 3 October 2026 Setting a duration is easy. Getting a song that actually fits that duration is harder. A length cap may get you a 2:30 track that still sounds rushed, skips the bridge, or ends mid-phrase as if someone pulled the plug. You won't see any of that if you only check the number on the

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ProgrammingDEV Community ·

How I Built a Turn-Based AI Speaking Examiner with Node.js

IELTS Speaking is a live interview that runs 11 to 14 minutes. An examiner asks a question, you answer, and the examiner picks the next question based on what you said. There are three parts, and you get one band score for the whole thing. I'm building SmoothMock, an IELTS mock-test platform, and Speaking was the hardest module. A fixed list of recorded questions would have been easy to build, but it isn't the real test, so I wanted an examiner that listens and responds.

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ProgrammingDEV Community ·

FOUC-Proof Retro Design Systems

When building web interfaces with a retro arcade aesthetic, developers often adopt vibrant neon color palettes to recreate an 80s terminal feel. However, applying these bright accents directly across both light and dark surfaces introduces two critical problems. First, neon shades like electric cyan frequently fail minimum WCAG contrast requirements against pale backgrounds, dropping below the 4.5 to 1 ratio needed for accessibility. Second, relying on client-side JavaScript or late-loading framework components to manage theme state causes a jarring Flash of Unstyled Content or white flash dur

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ProgrammingDEV Community ·

Why Kep Runs Entirely on Ollama: The Architecture Behind Local-Only AI for Regulated Industries

Why Kep Runs Entirely on Ollama: The Architecture Behind Local-Only AI for Regulated Industries Kep is a private AI assistant for law firms and accountants that runs on a dedicated machine in the client's own office. Every architectural decision behind it follows from one rule: a client install only ever talks to a model running in the room it's sitting in. Here's how that rule shapes the code. This isn't a philosophical stance against cloud AI. It's a response to the position regulated firms are in: They answer to clients, insurers and auditors who increasingly ask one question about any AI t

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ProgrammingDEV Community ·

The Redis Guy Wrote a Local LLM Engine That Refuses to Be General. That's Why It Works.

Salvatore Sanfilippo (antirez, the guy who wrote Redis) shipped a local inference engine called DwarfStar 4, or ds4. It hit the Hacker News front page this week and the repo is sitting around 23k stars after about two weeks. The pitch is one sentence from the README: The code is self-contained and deliberately narrow, not a general GGUF runner: you need to use the GGUF files the project produces. Everyone else is racing to support every model on earth. antirez went the other way.

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ProgrammingDEV Community ·

Day 2 of DevOps: Git, CI/CD and Deploying a Webpage on AWS EC2

Part 2: DevOps and the Workflows Around It The moment my webpage loaded in the browser, served from an AWS EC2 instance, the whole session finally clicked. A few hours earlier, DevOps had been a word on a slide. Now it was something I had built and deployed myself. Part 1, we covered AWS fundamentals: IAM for permissions, EC2 for virtual servers, and S3 for storage. Day 2 was also led by Kinjal Gandhi and moved from understanding those pieces to using them in a real DevOps workflow.

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ProgrammingDEV Community ·

Turning My Platform API Into Real Kubernetes Resources

In the previous post, I introduced the first real API for Platform Lab: Application The idea was to let an application developer define something simple like: apiVersion: platform.shubforge.dev/v1alpha1 kind: Application metadata: name: greeting-service spec: image: greeting-service:1.0.0 replicas: 1 port: containerPort: 8080 At that point, Kubernetes could understand and validate the resource. But nothing actually happened after creating it. There was no Deployment. There was no Service. There was no platform behavior yet.

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