Bugfix in the built-in prompt references definition

internal/modules/extract/dnd/spells/extractor.go

@@ -25,16 +25,24 @@ var providedCapabilities = []string{
 	"dnd.spell_casts",
 }
 
+var acceptedReferenceMediaTypes = []string{
+	"application/json",
+	"application/x-yaml",
+	"application/yaml",
+	"text/markdown",
+	"text/plain",
+}
+
 var referenceSlots = []contracts.ReferenceSlot{
 	{
 		Name:               "glossary",
 		Description:        "Optional campaign glossary reference material used only for disambiguation.",
-		AcceptedMediaTypes: []string{"text/plain; charset=utf-8"},
+		AcceptedMediaTypes: append([]string(nil), acceptedReferenceMediaTypes...),
 	},
 	{
 		Name:               "roster",
 		Description:        "Optional campaign roster or player-character reference material used only for disambiguation.",
-		AcceptedMediaTypes: []string{"text/plain; charset=utf-8"},
+		AcceptedMediaTypes: append([]string(nil), acceptedReferenceMediaTypes...),
 	},
 }