Error when trying to install agent-shell-sidebar via use-package :vc

[alexispurslane]

My config:

(defun user/llm-layer ()
    (use-package shell-maker
        :ensure t)
    (use-package acp
        :vc (:url "https://github.com/xenodium/acp.el"))
    (use-package agent-shell
        :vc (:url "https://github.com/xenodium/agent-shell")
        :config
        (setq agent-shell-qwen-authentication
              (agent-shell-qwen-make-authentication :login t)))
    (use-package agent-shell-sidebar
        :after agent-shell
        :vc (:url "https://github.com/cmacrae/agent-shell-sidebar")
        :bind
        (("C-c a s" . agent-shell-sidebar-toggle)
         ("C-c a f" . agent-shell-sidebar-toggle-focus))
        :config
        (setq agent-shell-sidebar-width "30%")
        (setq agent-shell-sidebar-position 'left)
        (setq agent-shell-sidebar-locked nil)
        (setq agent-shell-sidebar-default-config
              (agent-shell-qwen-make-agent-config))))

The Lisp error that pops up in a backtrace buffer:

Debugger entered--Lisp error: (error "Failed (status 1): git --no-pager checkout cfc3978b7c14ff475a898ed4eb2667bf9399b1a9 .")
  error("Failed (%s): %s" "status 1" "git --no-pager checkout cfc3978b7c14ff475a898ed4eb2667bf9399b1a9 .")
  vc-do-command("*vc*" 0 "git" nil "--no-pager" "checkout" "cfc3978b7c14ff475a898ed4eb2667bf9399b1a9")
  vc-git-command(nil 0 nil "checkout" "cfc3978b7c14ff475a898ed4eb2667bf9399b1a9")
  vc-git-retrieve-tag("/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" "cfc3978b7c14ff475a898ed4eb2667bf9399b1a9" nil)
  vc-call-backend(Git retrieve-tag "/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" "cfc3978b7c14ff475a898ed4eb2667bf9399b1a9" nil)
  vc-retrieve-tag("/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" "cfc3978b7c14ff475a898ed4eb2667bf9399b1a9")
  package-vc--clone(#s(package-desc :name agent-shell-sidebar :version nil :summary "No description available." :reqs nil :kind vc :archive nil :dir "/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" :extras nil :signed nil) (:url "https://github.com/cmacrae/agent-shell-sidebar") "/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" :last-release)
  package-vc--unpack(#s(package-desc :name agent-shell-sidebar :version nil :summary "No description available." :reqs nil :kind vc :archive nil :dir "/Users/alexispurslane/.emacs.d/elpa/agent-shell-sidebar/" :extras nil :signed nil) (:url "https://github.com/cmacrae/agent-shell-sidebar") :last-release)
  package-vc-install((agent-shell-sidebar :url "https://github.com/cmacrae/agent-shell-sidebar") :last-release)
  use-package-vc-install((agent-shell-sidebar (:url "https://github.com/cmacrae/agent-shell-sidebar") :last-release) nil)
  (progn (use-package-ensure-elpa 'agent-shell-sidebar 'nil 'nil) (use-package-vc-install '(agent-shell-sidebar (:url "https://github.com/cmacrae/agent-shell-sidebar") :last-release) nil) (defvar use-package--warning91 #'(lambda (keyword err) (let ((msg (format "%s/%s: %s" ... keyword ...))) (display-warning 'use-package msg :error)))) (condition-case err (eval-after-load 'agent-shell #'(lambda nil (progn (if (fboundp ...) nil (autoload ... "agent-shell-sidebar" nil t)) (if (fboundp ...) nil (autoload ... "agent-shell-sidebar" nil t)) (eval-after-load 'agent-shell-sidebar #'...) (progn (let* ... ... ... ...) (let* ... ... ... ...))))) ((debug error) (funcall use-package--warning91 :catch err))))
  (progn (progn (use-package-ensure-elpa 'agent-shell-sidebar 'nil 'nil) (use-package-vc-install '(agent-shell-sidebar (:url "https://github.com/cmacrae/agent-shell-sidebar") :last-release) nil) (defvar use-package--warning91 #'(lambda (keyword err) (let ((msg ...)) (display-warning 'use-package msg :error)))) (condition-case err (eval-after-load 'agent-shell #'(lambda nil (progn (if ... nil ...) (if ... nil ...) (eval-after-load ... ...) (progn ... ...)))) ((debug error) (funcall use-package--warning91 :catch err)))))
  eval((progn (progn (use-package-ensure-elpa 'agent-shell-sidebar 'nil 'nil) (use-package-vc-install '(agent-shell-sidebar (:url "https://github.com/cmacrae/agent-shell-sidebar") :last-release) nil) (defvar use-package--warning91 #'(lambda (keyword err) (let (...) (display-warning ... msg :error)))) (condition-case err (eval-after-load 'agent-shell #'(lambda nil (progn ... ... ... ...))) ((debug error) (funcall use-package--warning91 :catch err))))) t)
  elisp--eval-last-sexp(nil)
  #f(compiled-function () #<bytecode 0x28a6e785ccaa>)()
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  god-mode-self-insert()
  funcall-interactively(god-mode-self-insert)
  command-execute(god-mode-self-insert)

The shell error that pops up in a buffer above that:

error: The following untracked working tree files would be overwritten by checkout:
	agent-shell-sidebar.el
Please move or remove them before you switch branches.
error: The following untracked working tree files would be removed by checkout:
	.gitattributes
	LICENSE
	README.md
Please move or remove them before you switch branches.
Aborting

I have not previously installed this package, and in fact this still happens even after manually going in and deleting ~/.emacs.d/elpa/agent-shell-sidebar entirely, although it reappears after trying again, of course.