diff --git a/nanobot/agent/tools/filesystem.py b/nanobot/agent/tools/filesystem.py
index 11f05c557..27ae3ccd9 100644
--- a/nanobot/agent/tools/filesystem.py
+++ b/nanobot/agent/tools/filesystem.py
@@ -186,7 +186,7 @@ class WriteFileTool(_FsTool):
             fp = self._resolve(path)
             fp.parent.mkdir(parents=True, exist_ok=True)
             fp.write_text(content, encoding="utf-8")
-            return f"Successfully wrote {len(content)} bytes to {fp}"
+            return f"Successfully wrote {len(content)} characters to {fp}"
         except PermissionError as e:
             return f"Error: {e}"
         except Exception as e: