fix(mux): validate scenario custom scorer references

Stainless-Generated-From: e52c2baeebfbfd0e592b6918e43d7fc212d8da92

Author: stlc-bot

scripts/mock

@@ -68,7 +68,11 @@ class ScorerCustomScoringFunction(BaseModel):
     """CustomScoringFunction is a custom, user defined scoring function."""
 
     custom_scorer_type: str
-    """Type of the scoring function, previously registered with Runloop."""
+    """Type of the scoring function, previously registered with Runloop.
+
+    When creating or updating a scenario, must be non-empty and contain only
+    letters, digits, underscores, and hyphens ([a-zA-Z0-9_-]+).
+    """
 
     type: Literal["custom_scorer"]
 

src/runloop_api_client/types/scoring_function.py

@@ -67,7 +67,11 @@ class ScorerCustomScoringFunction(TypedDict, total=False):
     """CustomScoringFunction is a custom, user defined scoring function."""
 
     custom_scorer_type: Required[str]
-    """Type of the scoring function, previously registered with Runloop."""
+    """Type of the scoring function, previously registered with Runloop.
+
+    When creating or updating a scenario, must be non-empty and contain only
+    letters, digits, underscores, and hyphens ([a-zA-Z0-9_-]+).
+    """
 
     type: Required[Literal["custom_scorer"]]