Install and manage plugins changedplugins/install
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235235A private marketplace is one in a repository you need credentials to clone, on GitHub or any other git host. You add it with the same `/plugin marketplace add` or `claude plugin marketplace add` command as a public one. Claude Code clones it with the git credentials already on your machine and never prompts, so each way of connecting has a requirement:
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237* **HTTPS**: your git credential helpers apply, so access you set up with `gh auth login`, the macOS Keychain, or `git-credential-store` works. Interactive prompts are suppressed, so a host you have never authenticated to fails instead of asking for a password.
237* **HTTPS**: your git credential helpers apply, so access you set up with `gh auth login`, the macOS Keychain, or `git-credential-store` works. Git's prompts and askpass programs are off, including one set in `GIT_ASKPASS`, so the clone fails instead of prompting when git would have to ask for a credential.
238238* **SSH**: the host must already be in your `known_hosts` file and the key must work without a passphrase prompt. If your git setup names an SSH program in `GIT_SSH_COMMAND`, `GIT_SSH`, or your git config's `core.sshCommand`, Claude Code runs that program.
239239* **GitHub `owner/repo` shorthand**: Claude Code checks whether your SSH key authenticates to `github.com`, then clones over SSH if it does and over HTTPS if it doesn't. Set [`CLAUDE_CODE_PLUGIN_PREFER_HTTPS=1`](https://code.claude.com/docs/en/env-vars#variables) to skip that check and always clone over HTTPS.
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