OpenAI's official Astra prompting guide ships a banned-word list.

The primary docs tell you to instruct Astra to "bias towards action and carry the user's intended task to completion," and to avoid slop words including delve, foster, leverage, "it's worth noting," "importantly," "Bottom Line:" conclusions, and contrastive framing like "X, not Y." Notable that a vendor now publishes a word bank. The genuinely useful item is a debugging prompt: when a skill causes the model to pause or ask permission, it must name and link the exact SKILL.md file it read, quote the instruction, and explain how it applies. Steal that one verbatim.