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I charge per invoice extracted. One upload of a five-invoice PDF should cost five credits, a failed extraction should cost nothing, and a user with one credit left must never get two. That last rule is where it got interesting. This is the billing design behind GSTExtract — a tool that reads Indian GST invoice PDFs into Excel — and the concurrency bug a second-pass audit found in it. Writing it up because "meter a paid API correctly" is one of those problems that looks trivial until you hol...

Intro : The latest iteration of Copilot Studio has landed (announced last week at MSFT BUILD 26 , promising a transformative experience in agent building. As with any significant overhaul, it brings a mix of innovation and growing pains. To objectively assess this new landscape, let's apply a simple, yet powerful, mental model: the Good, the Bad, and the Nitty-Gritty. This framework helps us highlight the triumphs, confront the challenges, and identify the essential, sometimes less glamorous, ...

If you persist embeddings, you must persist the embedder. A vector index is only meaningful next to the exact model that produced it. It's an easy mistake because everything looks fine — the vectors are right there on disk, the search runs, no error is thrown. It's only wrong by a dimension you can't see. The fix The embedder now travels inside the single cartridge file — same one-file, binary-only format, no sidecar. On load it's restored, and every read (and every...

I have been running more local AI coding agents lately: Codex, Claude Code, Gemini CLI, Cursor Agent, and a few terminal-heavy workflows. The useful part is obvious, but the day-to-day ergonomics can get messy quickly. Each agent has its own terminal, its own waiting state, its own approval prompts, and its own history. If I look away at the wrong moment, I miss the fact that one of them is blocked waiting for a decision. So I built Agent Island , a native macOS utility that turns the not...

Most Node.js APIs start the same way. A server.js file. A few routes. Maybe an app.js if you've read a tutorial. Everything in one place because the app is small and there's no reason to complicate it yet. Then the app grows. Routes multiply. Business logic leaks into route handlers. Error handling is copy-pasted across files with slight variations. A new developer joins and spends their first week just trying to understand where things live. The API still works. But it's become ...

As a full-stack product engineer, one of the most persistent challenges I face is managing performance bottlenecks that arise between frontend, backend, and infrastructure. While we often optimize individual layers, true efficiency demands a holistic approach. In this post, I’ll walk through a common bottleneck scenario—slow API responses impacting frontend rendering—and share practical solutions. Profiling the Bottleneck: Start with robust monitoring tools—like New Relic or Chrome DevTo...

New feature just dropped: You can now search any trader's profile on JexTrade and instantly see what the smart money is holding on Polymarket. What the New Feature Does JexTrade has added searchable trader profiles . This means: Search by username, wallet address, or display name View current positions with real-time prices and PnL See historical performance and trade history Discover what top traders are betting on right now Get better context before enteri...

LC 1046 My two cents: Each push and pop requires a rearrangement of the existing elements, it's almost like the priority queue is a living organism which evolves / devolves it self to maintain the order of the elements. Swap, BubbleUp, & BubbleDown are the methods doing the main lifting. Here, swap is the simple swap operation const temp: T = this.heap[i]; this.heap[i] = this.heap[j]; this.heap[j] = temp The this.compare dependency injection is the soul of th...

The most annoying bug in my local AI assistant was not that it refused to ask for permission. It was that it asked too often. I would give it a normal task like "read this PDF and tell me what is inside." The assistant would make a reasonable first move, ask for approval, run the command, and then immediately ask again for the next tiny probe. One task turned into a permission treadmill. The approval loop felt safe but unusable Approval prompts are good. I want a local a...

I run two AI coding agents simultaneously when I work. Claude Code handles architecture decisions and code review. Codex runs parallel implementation tasks — writing tests, scaffolding modules, handling migrations. On a productive day, they make hundreds of decisions between them. I have no idea what most of those decisions are. I'm not exaggerating. I set the direction. I review the outputs. But the intermediate reasoning — why Claude Code chose this abstraction over that one, why Codex s...

1. The Pain Came First Everyone knows this. You open a class and there it is: the if-else chain. Twenty branches. Thirty. Some with comments like // TODO: refactor from 2019. You know you shouldn't touch anything — side effects, unknown dependencies, missing tests. So you add your case. At the bottom. After the last else. And you go home with that bad feeling that you've become part of the problem. 2. My First Attempt — And Why It Didn't Make Me Happy Eventually, I'd ...

During the last weeks, I tried to learn a lot from Dart and Flutter, but even after a bit less than 1 month, I still don't know some basic stuff. When I was dealing with command line arguments parsing, I was thinking "how to get the goddamn program name". You know, the string you can simply have with argv[0] 1 in C or with the functions exported by the init module in Erlang. In Dart, you will require dart:io package and the Platform class. Let write a small program to print out ...

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Anthropic leaders flew to Washington, DC, to meet with White House officials on Monday. After high-level talks, they’re still split on the risk Claude Fable 5 presents.