diff --git a/README.md b/README.md
index fa56042..b9b3e3a 100644
--- a/README.md
+++ b/README.md
@@ -73,9 +73,12 @@ The check validates four things for every non-break-glass Agent PR:
    Unknown roles, missing `bug-` segment, uppercase bug-ids, and empty
    kebab descriptions all produce a `FAIL[check-naming]` log line.
 
-2. **Title form** — for a `role/bug` branch the title must start with
-   `[bug-<id>] `. For a `chore` branch the title must have no `[bug-id]`
-   prefix. If both carry a bug-id they must match.
+2. **Title form** — for a `role/bug` branch the title must be
+   `[bug-<id>] type(scope): description`. The type starts with a lowercase
+   letter and the type and one-component scope contain only lowercase letters,
+   digits, and hyphens. An optional `!` may follow the scope, and the description
+   must contain a non-whitespace character. For a `chore` branch the title must
+   have no `[bug-id]` prefix. If both carry a bug-id they must match.
 
 3. **Tracking and attribution** — on Bug-backed work, `## Tracking` contains both the literal
    `Fixes bug-<id>` automation token and the matching navigable
diff --git a/check.sh b/check.sh
index 7fc97bc..0297804 100755
--- a/check.sh
+++ b/check.sh
@@ -125,12 +125,12 @@ if [ "${BRANCH_KIND}" = "role-bug" ]; then
   if [ -z "${TITLE_BUG}" ]; then
     echo "FAIL[check-naming]: title must lead with [${BRANCH_BUG}]"
     echo "  have: ${TITLE}"
-    echo "  want: [${BRANCH_BUG}] ${TITLE}"
+    echo "  want: [${BRANCH_BUG}] fix(scope): description"
     FAILED=1
   elif [ "${TITLE_BUG}" != "${BRANCH_BUG}" ]; then
     echo "FAIL[check-naming]: bug-id mismatch — branch carries '${BRANCH_BUG}' but title carries '${TITLE_BUG}'"
     FAILED=1
-  elif ! printf '%s\n' "${TITLE}" | grep -qE "^\\[${BRANCH_BUG}\\] [a-z][a-z0-9-]*\\([a-z0-9][a-z0-9-]*\\)!?: .+"; then
+  elif ! printf '%s\n' "${TITLE}" | grep -qE "^\\[${BRANCH_BUG}\\] [a-z][a-z0-9-]*\\([a-z0-9][a-z0-9-]*\\)!?: .*[^[:space:]]$"; then
     echo "FAIL[check-naming]: Bug-backed title must use '[${BRANCH_BUG}] type(scope): description'"
     FAILED=1
   fi
diff --git a/tests/run b/tests/run
index a63acde..da90bf1 100755
--- a/tests/run
+++ b/tests/run
@@ -127,6 +127,8 @@ check "role/bug Conventional title"     0 "dev/bug-x7k2m9/fix-resize"     "[bug-
 check "role/bug plain title"            1 "dev/bug-x7k2m9/fix-resize"     "[bug-x7k2m9] Fix resize"           "dev"
 check "role/bug missing scope"          1 "dev/bug-x7k2m9/fix-resize"     "[bug-x7k2m9] fix: fix resize"      "dev"
 check "role/bug path scope"             1 "dev/bug-x7k2m9/fix-resize"     "[bug-x7k2m9] fix(hub/bugs): fix resize" "dev"
+check "role/bug empty description"      1 "dev/bug-x7k2m9/fix-resize"     "[bug-x7k2m9] fix(hub): "            "dev"
+check "role/bug whitespace description" 1 "dev/bug-x7k2m9/fix-resize"    "[bug-x7k2m9] fix(hub):   "           "dev"
 check "chore Conventional title"        0 "chore/bump-deps"                "chore(deps): bump deps"      "dev"
 
 # fail: invalid branch forms