Checking if a Schema is Encodable to Strings in Effect Typescript

//my id Schema
export const Id = Schema.Union(Schema.Number,Schema.NumberFromString)
  .pipe(Schema.brand("DatabaseID"));

//using that id
const MyApi = HttpApi.make("MyApi").add(
  HttpApiGroup.make("users")
    .add(
      HttpApiEndpoint.get("list")`/list`.addSuccess(Schema.Array(User))
    )
    .add(
      HttpApiEndpoint.get("by_id")`/:id`
        .setPath(
          Schema.Struct({
            id: Id // <============= why I can't use Id Schema
          })
        )
        .addSuccess(User)
    )
)