FACTS.md pattern keeps Claude from inventing prices in customer replies

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Small businesses using LLMs to answer customers often get confident but wrong replies, such as unapproved discounts or unlisted delivery promises. The proposed fix is to have the model answer only from a single FACTS.md file that lists prices, hours, and policies. If a fact is absent, the model replies with a holding message and flags the gap to the owner as a to-do. The author tested this on a fictional coffee shop across 11 prompts, which surfaced issues like replies in the wrong language that were then added as rules. The approach is only as reliable as the FACTS.md file, and the author recommends a human review drafts before sending.

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