Add StyxValidationError

Author: nx10

src/styxdefs/__init__.py

@@ -17,6 +17,7 @@
     OutputPathType,
     Runner,
     StyxRuntimeError,
+    StyxValidationError,
 )
 
 __all__ = [
@@ -30,4 +31,5 @@
     "get_global_runner",
     "set_global_runner",
     "StyxRuntimeError",
+    "StyxValidationError",
 ]

src/styxdefs/types.py

@@ -169,3 +169,18 @@ def __init__(
             message += f"\n{message_extra}"
 
         super().__init__(message)
+
+
+class StyxValidationError(Exception):
+    """Styx validation error.
+
+    Raised when input validation fails for parameters.
+    """
+
+    def __init__(self, message: str) -> None:
+        """Initialize the error.
+
+        Args:
+            message: The validation error message.
+        """
+        super().__init__(message)