You can optionally include a list of one or more additional policies, specified as strings. If you want to include only a list of policies by string, use GetContextKeysForCustomPolicy instead.
Note: This API discloses information about the permissions granted to other users. If you do not want users to see other user's permissions, then consider allowing them to use GetContextKeysForCustomPolicy instead.
Context keys are variables maintained by AWS and its services that provide details about the context of an API query request, and can be evaluated by testing against a value in an IAM policy. Use GetContextKeysForPrincipalPolicy to understand what key names and values you must supply when you call SimulatePrincipalPolicy.