diff --git a/tilecloud_chain/internal_mapcache.py b/tilecloud_chain/internal_mapcache.py
index e5a0b5cc4..001a114a2 100644
--- a/tilecloud_chain/internal_mapcache.py
+++ b/tilecloud_chain/internal_mapcache.py
@@ -179,15 +179,17 @@ def compute_tile(self, tile: Tile) -> bool:
         if tile.error:
             _LOG.error("Tile %s %s in error: %s", tile.tilecoord, tile.formated_metadata, tile.error)
             return False
+        success = True
         for tile_ in tile.metadata["tiles"].values():  # type: ignore
             if tile_.error:
                 _LOG.error("Tile %s %s in error: %s", tile_.tilecoord, tile_.formated_metadata, tile_.error)
-                return False
+                success = False
             if tile_.data is None:
                 _LOG.error("Tile %s %s in error: no data", tile_.tilecoord, tile_.formated_metadata)
-                return False
+                success = False
+            _LOG.debug("Tile %s %s generated", tile_.tilecoord, tile_.formated_metadata)
             self._cache_store.put_one(tile_)
-        return True
+        return success
 
     @contextlib.contextmanager
     def lock(self, tile: Tile) -> Iterator[None]:
diff --git a/tilecloud_chain/multitilestore.py b/tilecloud_chain/multitilestore.py
index fd87cf618..95988806e 100644
--- a/tilecloud_chain/multitilestore.py
+++ b/tilecloud_chain/multitilestore.py
@@ -114,6 +114,15 @@ def apply(key: tuple[str, str], tiles: Iterator[Tile]) -> Iterator[Tile]:
 
         return chain.from_iterable(starmap(apply, groupby(tiles, self._get_layer)))
 
+    def __str__(self) -> str:
+        """Return a string representation of the object."""
+        stores = {store.__class__.__name__ for store in self.stores.values() if store is not None}
+        return f"{self.__class__.__name__}({', '.join(stores)})"
+
+    def __repr__(self) -> str:
+        """Return a string representation of the object."""
+        return str(self)
+
     @staticmethod
     def _get_layer(tile: Tile | None) -> tuple[str, str]:
         assert tile is not None