diff --git a/README.md b/README.md
index 37d03a0..8256461 100644
--- a/README.md
+++ b/README.md
@@ -76,4 +76,5 @@ Live data access requires permission to access the Sales Intelligence Knowledge
 
 - Keep stable Codex instructions in `SKILL.md`.
 - Put detailed CLI behavior and field mappings in `references/`.
+- Add tests when changing intents, query behavior, SQL builders, scope disclosure, or output contracts.
 - Keep generated outputs, temporary files, and local workspace artifacts outside the skill repository whenever possible.