How to Create Your Own AI Coding Agent

Nearly all developers are taking advantage of AI coding tools, but what happens when you have a particular niche, where not only do LLM's have less knowledgeable, but potentially their knowledge is based on the general, which is straight up wrong for your niche. This is what I found when making Power Platform Code Apps. Code Apps are full React apps that are hosted in the Power Platform. For that reason they have a specific SDK kit and cli commands. Models like Opus 4.6 do a good job considering how niche it is, but imagine when you then build someone bespoke on top of that niche. That's what I did, as I don't use React I wanted a vanilla JavaScript build (before you comment yes I know I should use React and Typescript, but remember I'm a little strange). This meant there was simply no training or even docs on it. And because it was using vanilla JavaScript, all of the training data actually kept sending the LLM down the wrong path. So at this point I wanted to create my own coding age