intent schema slot type slot types utterance invocation name lambda function trigger triggers built in slots built in intents different types of skills custom skills smart home skills flash briefing skills custom skill smart home skill flash briefing skill audio player audio player directives sample utterances sample utterance audio player directive a. r. n. amazon resource name publishing information category testing instructions testing instruction skill description short skill description long skill description full skill description example phrases example phrase keywords keyword icon small icon large icon privacy and compliance privacy policy terms of use terms of service export compliance