AWS Assume Role Helper is a command-line utility designed to simplify the process of switching between different AWS roles and accounts. The tool addresses the common challenge faced by developers and security professionals who need to work with multiple AWS environments. The utility operates by modifying the AWS credentials file (~/.aws/credentials) to facilitate role switching. When switching roles, it preserves existing default role configurations by storing them in a temporary role before applying the new assumed role as the default. This approach allows users to immediately begin using the new role without manual credential file editing. The tool is particularly useful for local development scenarios where applications need to simulate the permissions they would have when running in AWS environments. This includes developing applications that will run on EC2 instances or testing Lambda functions locally using AWS SAM, where the local environment needs to assume the same roles that would be used in production. The helper streamlines the workflow for security professionals and developers who regularly switch between different AWS accounts, users, or roles as part of their security testing, development, or operational activities.