diff --git a/csst_common/pipeline.py b/csst_common/pipeline.py
index 5fad3af614d26d661174cb3d35bcf85d7b095b31..c8f062479947e5a472f10d0284ab95f46aeb335d 100644
--- a/csst_common/pipeline.py
+++ b/csst_common/pipeline.py
@@ -150,11 +150,11 @@ class Pipeline:
         h.set("CREATED", self.pipeline_id, comment="pipeline build time")
         return reformat_header(h, strip=False, comment="Pipeline summary")
 
-    def summary(self):
+    def summarize(self):
         """Summarize this run."""
         t_stop: Time = Time.now()
         t_cost: float = (t_stop - self.t_start).value * 86400.0
-        self.pipeline_logger.info(f"Total cost: {t_cost} sec")
+        self.pipeline_logger.info(f"Total cost: {t_cost:.1f} sec")
 
     def clean_output(self):
         """Clean output directory."""
@@ -294,10 +294,10 @@ class Message:
             for d in dlist:
                 f.write(self.dict2msg(d) + "\n")
 
-    def preview(self, dlist: list[dict]) -> str:
-        """Preview messages."""
+    def preview(self, dlist: list[dict], n: int = 10) -> None:
+        """Preview top `n` messages."""
         s = ""
-        for d in dlist:
+        for d in dlist[:n]:
             s += self.dict2msg(d) + "\n"
         print(s)