This will enable your Lambda function to be called by an Alexa Skill kit.
amzn1.ask.skill.xx-xx-xx-xx-xx is a skill ID for Alexa Skills kit. You receive a skill ID once you register and create a skill in Amazon Developer Console.
After deploying, add your deployed Lambda function ARN to which this event is attached to the Service Endpoint under Configuration on Amazon Developer Console.
functions: mySkill: handler: mySkill.handler events: - alexaSkill: amzn1.ask.skill.xx-xx-xx-xx-xx
alexaSkill events are enabled by default.
This will create and attach a alexaSkill event for the
mySkill function which is disabled. If enabled it will call
mySkill function by an Alexa Skill.
functions: mySkill: handler: mySkill.handler events: - alexaSkill: appId: amzn1.ask.skill.xx-xx-xx-xx enabled: false
Previous syntax of this event didn't require a skill ID as parameter, but according to Amazon's documentation you should restrict your lambda function to be executed only by your skill.
Omitting the skill id will make your Lambda function available for the public, allowing any other skill developer to invoke it.
(This is important, as opposing to custom HTTPS endpoints, there's no way to validate the request was sent by your skill.)