diff --git a/tests/smoke-test.sh b/tests/smoke-test.sh
index 7aee057..494c5d2 100755
--- a/tests/smoke-test.sh
+++ b/tests/smoke-test.sh
@@ -88,6 +88,15 @@ test_weather_server_go() {
 # and exits. Empty rather than unset: dotenv skips a name already present in
 # ENV, so a key in the environment or a local .env would start the chat loop.
 
+# Test: Ruby weather server
+test_weather_server_ruby() {
+    check_dependency ruby || return 1
+    check_dependency bundle || return 1
+    local server_dir="${PROJECT_ROOT}/weather-server-ruby"
+    ensure_bundled "${server_dir}" || return 1
+    (cd "${server_dir}" && node "${TEST_CLIENT}" bundle exec ruby weather.rb)
+}
+
 # Test: Python MCP client
 test_mcp_client_python() {
     check_dependency uv || return 1
@@ -119,14 +128,13 @@ test_mcp_client_ruby() {
 # is present, so they cannot be driven without credentials. Making them start
 # credential-free is a change in their own directories, so their coverage lands
 # with those changes rather than here.
-#
-# Nor is the Ruby weather server: the mcp gem does not stamp the resultType
-# field that 2026-07-28 requires, so the test client rejects its responses.
+
 print_header "Running smoke tests"
 run_test "weather-server-python" test_weather_server_python
 run_test "weather-server-typescript" test_weather_server_typescript
 run_test "weather-server-rust" test_weather_server_rust
 run_test "weather-server-go" test_weather_server_go
+run_test "weather-server-ruby" test_weather_server_ruby
 run_test "mcp-client-python" test_mcp_client_python
 run_test "mcp-client-typescript" test_mcp_client_typescript
 run_test "mcp-client-ruby" test_mcp_client_ruby