SSH connection ignores Identity File setting, requires ssh-agent

Bug Description

Claude Code's SSH connection dialog has an "Identity File (Private Key)" field, but it appears to be ignored. The SSH connection always falls back to asking for a password, even when:

• The correct key path is specified (both ~/.ssh/id_rsa and /Users/<user>/.ssh/id_rsa)
• The key has no passphrase
• The key works perfectly from the terminal with ssh -i ~/.ssh/id_rsa
• The ~/.ssh/config has a matching Host entry with IdentityFile

Steps to Reproduce

1. Create an SSH connection in Claude Code
2. Set SSH Host to user@host
3. Set Identity File to ~/.ssh/id_rsa (a valid, passphrase-free key)
4. Save and connect
5. Claude Code prompts for a password instead of using the key

Workaround

Loading the key into ssh-agent first makes it work:

ssh-add ~/.ssh/id_rsa

Expected Behavior

Claude Code should use the identity file specified in the connection settings (or from ~/.ssh/config) without requiring the key to be loaded into ssh-agent.

Environment

• macOS (Darwin 25.2.0)