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The 2 I know, Cursor and Claude Code, will give you a percentage used for the context window. So if you know the size of the window, you can deduce the number of tokens used.

Claude code also gives you a granular breakdown of what’s using context window (system prompt, tools, conversation history, etc). /context

In Claude code I believe it's /context and it'll give you a graphical representation of what's taking context space

> Since I'm yet to seriously dive into vibe coding or AI-assisted coding

Unless you’re using a text editor as an IDE you probably have already

Cline gives you such a thing. you dont really know where the dumb zone by numbers though, only by feel.

Most tools do, yes.

OpenCode does this. Not sure about other tools