After running
eval `ssh-agent -s`
ssh-add ~/.ssh/id_rsa
and entering my passphrase, git still prompts me to enter the passphrase every time I perform a remote action.
To illustrate:
bash-4.1$ echo $SSH_AUTH_SOCK
/tmp/ssh-cWNDloIzZkhW/agent.5560
bash-4.1$ ssh-add -l
2048 <fingerprint> /cygdrive/c/Users/<username>/.ssh/id_rsa (RSA)
bash-4.1$ git pull
Enter passphrase for key '/cygdrive/c/Users/<username>/.ssh/id_rsa':