执行ssh命令时ssh-agent无法正常工作的问题求助

环境详情 #

$ ssh -V
OpenSSH_8.2p1 Ubuntu-4ubuntu0.5, OpenSSL 1.1.1f  31 Mar 2020
$ ssh-add -L
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE5FkZ3APf9VLQFHZQV9+JFsNSvY5u33uv5/EWGoQwl5 
$ curl https://github.com/impactaky.keys
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE5FkZ3APf9VLQFHZQV9+JFsNSvY5u33uv5/EWGoQwl5
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH+nGZTKYUTVOlcJR+OFBE1zDvv5DT2DAcxznTSzXdtr

问题表现 #

连接GitHub时，ssh未尝试使用ssh-agent中已加载的密钥，直接遍历本地~/.ssh目录下的密钥文件并要求输入密码：

$ ssh -T -vv git@github.com
OpenSSH_8.2p1 Ubuntu-4ubuntu0.5, OpenSSL 1.1.1f  31 Mar 2020
...
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/impactaky/.ssh/id_rsa
debug1: Trying private key: /home/impactaky/.ssh/id_dsa
debug1: Trying private key: /home/impactaky/.ssh/id_ecdsa
debug1: Trying private key: /home/impactaky/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/impactaky/.ssh/id_ed25519
Enter passphrase for key '/home/impactaky/.ssh/id_ed25519':

配置说明 #

我使用自定义Zsh脚本管理ssh-agent，包含密钥自动加载等相关设置。

求帮忙排查问题，感谢！

内容的提问来源于stack exchange，提问作者impactaky