A system prompt is the standing instruction a model reads before every request. For channel analysis, it sets the role, the boundaries, and the output rules once, so you do not repeat them in every message.
Written well, it acts like a brief that keeps a long session coherent. Written badly, it adds noise the model has to work around on every turn.
Put the role first, then the constraints, then the format. 'You are a channel analyst who works only from the data provided' tells the model its job and its limits in one line.
Add the rules that must never slip: cite the row behind a claim, say when the data cannot support an answer, and never guess at numbers that are not present.
Standing rules beat repeated reminders. Set them once and the model carries them through a long back-and-forth without you restating the basics.
A good system prompt is a standing brief. It says the same thing every time so you never have to.
Every extra line in a system prompt competes for the model's attention. Keep it under a page and cut anything that restates a rule already covered.
If a rule keeps getting ignored, move it to the end where the model reads it last, or restate it in the user message for that specific task.
Treat the system prompt as a living brief. Adjust it whenever the same problem shows up across unrelated sessions.
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