diff --git a/src/mcp/shared/exceptions.py b/src/mcp/shared/exceptions.py
index d8855b8d..97a1c09a 100644
--- a/src/mcp/shared/exceptions.py
+++ b/src/mcp/shared/exceptions.py
@@ -7,3 +7,8 @@ class McpError(Exception):
     """
 
     error: ErrorData
+
+    def __init__(self, error: ErrorData):
+        """Initialize McpError."""
+        super().__init__(error.message)
+        self.error = error