Hub-wide Ground Rules

Ground rules are house rules that must hold for every prompt in your Purple Hub — tone of voice, brand voice, spelling conventions, legal constraints, topics to avoid. Instead of repeating them in every single prompt, you maintain them once centrally, and Purple Prompts automatically adds them to every request it sends to the language model.

Ground rules are edited in 'Purple Prompts' ❭ 'Settings', in the Ground Rules text area. Only administrators can open this settings page. The same page is where the API keys and the model for each job are configured, see AI Models and API Keys.



The field is empty by default. As long as it is empty, every prompt behaves exactly as it did before — nothing is added.

Write the rules in whatever language fits your content most.

The rules are added directly in front of the instructions of the individual prompt, for every feature that runs a prompt:

An individual prompt still wins where it needs to: the ground rules are handed to the model with the note that they apply unless the prompt's own instructions explicitly override them. So a prompt that has to produce, say, an all-lowercase value can still say so and will be followed.

The ground rules are sent along with every request, so they add to the execution time and API cost of every single prompt, and a very long rule set can crowd out the instructions of the prompt itself. Keep them to the few rules that genuinely have to hold everywhere, and leave everything task-specific in the individual prompts.

For more on phrasing instructions that language models follow reliably, see Prompt Writing Best Practices.