That Codex one comes from the new `github` plugin, which includes a `github:yeet` skill. There are several ways to disable it: you can disconnect github from codex entirely, or uninstall the plugin, or add this to your config.toml:

    [[skills.config]]
    name = "github:yeet"
    enabled = false

I agree that skill is too opinionated as written, with effects beyond just creating branches.