[BUG] cloning git repositories with a FIDO2 SSH key no longer work when adding marketplaces or plugins from v2.0.15 and up

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I'm no longer able to add or update marketplaces or plugins via Claude Code. For example, /plugin marketplace add obra/superpowers-marketplace from v2.0.15 and up.

I connect to GitHub via a YubiKey backed fido2 SSH key.

Previously, this worked in V2.0.14. However, I now get the following error when trying to add a marketplace:

  ⎿  Error: Failed to clone marketplace repository: Cloning into '/home/dickson/.claude/plugins/marketplaces/obra-superpowers-marketplace'...
     notify_start: exec(/usr/bin/ssh-askpass): No such file or directory

I do get a prompt to touch my YubiKey as per usual, but after I do so, the error above appears.

I'm able to clone the repository normally outside of Claude Code.

What Should Happen?

Claude should be able to clone from GitHub.

Error Messages/Logs

Steps to Reproduce

1. Configure ~/.ssh/config to use a FIDO2 SSH key, backed by a YubiKey
2. Attempt to add a plugin marketplace with Claude Code

Claude Model

None

Is this a regression?

Yes

Last Working Version

2.0.14

Claude Code Version

Tested from 2.0.15 to 2.0.22

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_