diff --git a/backend/internal/pkg/apicompat/anthropic_to_responses.go b/backend/internal/pkg/apicompat/anthropic_to_responses.go
index a8106da4..fca3cf1f 100644
--- a/backend/internal/pkg/apicompat/anthropic_to_responses.go
+++ b/backend/internal/pkg/apicompat/anthropic_to_responses.go
@@ -431,7 +431,7 @@ func normalizeToolParameters(schema json.RawMessage) json.RawMessage {
 		return schema
 	}
 
-	typ, _ := m["type"]
+	typ := m["type"]
 	if string(typ) != `"object"` {
 		return schema
 	}