diff --git a/check.sh b/check.sh
index e562077..391c571 100755
--- a/check.sh
+++ b/check.sh
@@ -86,6 +86,8 @@ VISIBLE_BODY=$(printf '%s\n' "${RENDERED_BODY}" |
     }
   ')
 
+hidden_content_guidance='move ## Tracking and ## Attribution outside collapsed <details> or <video>/<audio> fallback content'
+
 # ---- branch form ----
 # <role>/bug-<id>/<kebab>
 if echo "${BRANCH}" | grep -qE "^(dev|ux|ops|security|perf|architect|support)/bug-[a-z0-9]+/[a-z0-9][a-z0-9-]*$"; then
@@ -124,7 +126,7 @@ if [ "${BRANCH_KIND}" = "role-bug" ]; then
     in_section { print }
   ')
   if [ -z "${tracking}" ]; then
-    echo "FAIL[check-naming]: PR body must contain a non-empty ## Tracking section"
+    echo "FAIL[check-naming]: PR body must contain a non-empty ## Tracking section visible by default; ${hidden_content_guidance}"
     FAILED=1
   else
     if ! printf '%s\n' "${tracking}" | grep -qE "(^|[[:space:]>])Fixes[[:space:]]+${BRANCH_BUG}([^a-z0-9]|$)"; then
@@ -150,7 +152,7 @@ if [ "${BRANCH_KIND}" != "invalid" ]; then
   ')
   watermark_re='Authored-By: .+ \(.+\) <a href="mailto:noreply@[[:alnum:].-]+"[^>]*>noreply@[[:alnum:].-]+</a>'
   if ! printf '%s\n' "${attribution}" | grep -qE "${watermark_re}"; then
-    echo "FAIL[check-naming]: ## Attribution must contain an Authored-By product/model watermark"
+    echo "FAIL[check-naming]: visible ## Attribution must contain an Authored-By product/model watermark; ${hidden_content_guidance}"
     FAILED=1
   fi
 
diff --git a/tests/run b/tests/run
index d0b974c..cbd31a0 100755
--- a/tests/run
+++ b/tests/run
@@ -190,10 +190,10 @@ check_contract "open text in another details attribute remains collapsed" \
   "$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
 check_contract "video fallback cannot hide provenance" \
   $'<video controls>\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</video>' \
-  "$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
+  "$BASE" "$GOOD_HEAD" "move ## Tracking and ## Attribution outside collapsed <details> or <video>/<audio> fallback content"
 check_contract "audio fallback cannot hide provenance" \
   $'<audio controls>\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</audio>' \
-  "$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
+  "$BASE" "$GOOD_HEAD" "move ## Tracking and ## Attribution outside collapsed <details> or <video>/<audio> fallback content"
 check_contract_pass "unrelated collapsed details remain available" \
   $'<details><summary>Logs</summary>\n\nSupporting output\n</details>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
   "$BASE" "$GOOD_HEAD"