diff --git a/src/kimi_cli/share.py b/src/kimi_cli/share.py
index 485869008..53631fff4 100644
--- a/src/kimi_cli/share.py
+++ b/src/kimi_cli/share.py
@@ -1,14 +1,13 @@
 from __future__ import annotations
 
 import os
+from functools import lru_cache
 from pathlib import Path
 
 
+@lru_cache(maxsize=1)
 def get_share_dir() -> Path:
-    """Get the share directory path."""
-    if share_dir := os.getenv("KIMI_SHARE_DIR"):
-        share_dir = Path(share_dir)
-    else:
-        share_dir = Path.home() / ".kimi"
+    """Return the Kimi share directory, creating it if necessary."""
+    share_dir = Path(os.environ.get("KIMI_SHARE_DIR", "~/.kimi")).expanduser()
     share_dir.mkdir(parents=True, exist_ok=True)
     return share_dir