but assuming we're not in coordinator mode, the prompt that instructs the main LLM to create an agent with the prompt text to create our statusline script is emitted, and if that works, then an agent will be run with the statusline system prompt, which is awesome.
So the prompt tells the LLM to modify the $PS1 variable in the shell configuration. for those non-computer touchers out there, the PS1 variable is the thing that customizes "what happens before my cursor on the shell line" - it's what makes it so sometimes it shows that folder you are in, and how people make their terminal look very fancy.
So the prompt text includes a whole fake JSON string that says "write a function that receives these kinds of parameters and then returns a whatever"
observe the prompt text in first image's description of fields and then the description on the claude code docs website. notice that they are ... different!!! like where is the cost field in the prompt description? the docs give a whole example of using this, but if you were to invoke it via the slash command, then it would just have no idea how to do that. the only way this succeeds is by virtue of the fact that the llm is just generating the most likely text anyway and so the odds of any of this succeeding are just "that some script that calls some variables with some maximally likely names represent some value that is maxmially likely, based on the training set prior."