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<https://www.pulumi.com/docs/tutorials/aws/aws-ts-assume-role/|https://www.pulumi.com/docs/tutorials/aws/aws-ts-assume-role/>

but this assumes that i create the role then use it, i want to just use a role

You need an access key for any api request to AWS
This is how IAM works

Is the machine that you're running this on an ec2 instance?
If so you can use an instance profile and allow that role to assume another role

Checkout <https://medium.com/swlh/aws-iam-assuming-an-iam-role-from-an-ec2-instance-882081386c49|https://medium.com/swlh/aws-iam-assuming-an-iam-role-from-an-ec2-instance-882081386c49>