diff --git a/e2e/demo-ascii-response/project/AGENTS.md b/e2e/demo-ascii-response/project/AGENTS.md
index fe859d8..6866e1f 100644
--- a/e2e/demo-ascii-response/project/AGENTS.md
+++ b/e2e/demo-ascii-response/project/AGENTS.md
@@ -10,3 +10,8 @@ Emma's next question is in `pending-request.md`. When changing or discussing
 assistant rules, you may read that question, but do not open any file it
 references or any shop record. Only open shop records when answering Emma's
 question.
+
+## Response format
+
+Use ASCII characters only in customer-facing replies. Use plain words and
+punctuation instead of emoji, typographic quotation marks, or special bullets.