Why tCode exists

Browser-based tAI is excellent for questions that stand on their own: explain this concept, draft this function, what does this error message usually mean. It starts to strain the moment an answer actually depends on the real state of a project you did not paste in, an existing file with its own conventions, a test suite that already exists and should keep passing, a function called from three other places you have not opened in a while.

That strain shows up as manual copying: pasting a file into the browser, pasting the answer back into your editor, running the tests yourself, then going back to the browser to explain what failed. Each round trip works, but it puts you in the position of manually relaying information between two things that could just talk to each other directly.

tCode removes the relaying. It runs in the folder you are already working in, so it reads the actual file before proposing a change and runs the actual test suite to check its own work, rather than reasoning about a pasted excerpt. See Use cases for the specific kinds of tasks where this ends up mattering most in practice.

This is not a claim that the browser is somehow worse; it is simply optimized for a different shape of question, one that is fully answerable from what you type into it. The strain only shows up once an answer genuinely depends on information the browser does not have and cannot get to on its own.

In practice, most people notice the gap the first time they catch themselves narrating a file's contents into a chat box, or explaining a test failure in prose instead of just letting something run it. That moment is usually the clearest signal that a task has crossed from "the browser is fine for this" into "this needs to actually touch my project."