If you follow the AWS CodeCommit documentation it instructs to run the commands:

git config --global credential.helper '!aws codecommit credential-helper $@'
git config --global credential.UseHttpPath true

https://docs.aws.amazon.com/codecommit/latest/userguide/setting-up-https-unixes.html#setting-up-https-unixes-credential-helper

However when running in Sourcetree this throws an error:

aws codecommit credential-helper $@ get: aws: command not found

If you change the command to point to the full path of aws-cli then the command work correctly:

git config --global credential.helper '/usr/local/bin/aws codecommit credential-helper $@'

Therefore it seems Sourcetree is not pulling in the path for aws-cli like other terminal windows?

Really this feature should be supported out-of-the-box, and we shouldn't have to put full paths in our scripts.