Add enums for list_repositories parameters

Author: danielssonsimonbcg

Diff for: pkg/github/organizations.go

@@ -21,13 +21,18 @@ func ListRepositories(getClient GetClientFn, t translations.TranslationHelperFun
 				mcp.Description("Organization name"),
 			),
 			mcp.WithString("type",
-				mcp.Description("Type of repositories to list. Possible values are: all, public, private, forks, sources, member. Default is 'all'."),
+				mcp.Description("Type of repositories to list."),
+				mcp.Enum("all", "public", "private", "forks", "sources", "member"),
+				mcp.DefaultString("all"),
 			),
 			mcp.WithString("sort",
-				mcp.Description("How to sort the repository list. Can be one of created, updated, pushed, full_name. Default is 'created'"),
+				mcp.Description("How to sort the repository list."),
+				mcp.Enum("created", "updated", "pushed", "full_name"),
+				mcp.DefaultString("created"),
 			),
 			mcp.WithString("direction",
-				mcp.Description("Direction in which to sort repositories. Can be one of asc or desc. Default when using full_name: asc; otherwise desc."),
+				mcp.Description("Direction in which to sort repositories. Default when using full_name: asc; otherwise desc."),
+				mcp.Enum("asc", "desc"),
 			),
 			WithPagination(),
 		),