[Copilot]

mlc add repo <path> silently registered the wrong path when the given path did not exist or was inaccessible. On Windows this reliably hits a mounted/network drive that is not visible to the running process (per-session mapped-drive / UAC quirk): mlc add repo Z:\pa\aocc-scripts registered C:\Users\amd\MLC\repos\aocc-scripts with no error.

Root cause — In RepoAction.add, when os.path.exists(input) is False the code assumed the input was a bare repo name and created/registered <repos_path>/<basename>. An explicit but temporarily-unreachable path fell into this branch.

Changes

• mlc/repo_action.py
  • Added _looks_like_filesystem_path() — flags absolute paths, anything containing a separator, Windows drive letters (Z:\… / Z:/…), and UNC paths. Recognized on any OS so behavior is testable off-Windows.
  • add now fails loudly with a clear error when an explicit path is missing/inaccessible, instead of creating the wrong folder. Bare names, URLs, and existing external paths are unchanged.
• tests/test_repo_action_add_path.py — covers the helper plus add behavior (missing explicit path errors without creating a stray folder; Windows-style path errors on any platform; existing external path registers as-is).
• .github/workflows/test-unit.yml — new windows-basic-commands job (windows-latest) running the repo-path tests, a basic mlc command smoke test (add/find/list/rm repo), and a regression check. Kept separate from the full unittest discover matrix because several existing tests drive the Unix bash installer and are not Windows-compatible.

Behavior

$ mlc add repo Z:\pa\aocc-scripts   # drive not visible to this process
ERROR - The repo path 'Z:\pa\aocc-scripts' does not exist or is not accessible.
        Please ensure the path is correct and that any mounted/network drive is
        available to this process before adding it as a repo.

✅ PR Checklist

✅ Testing & CI

• Have tested the changes in my local environment, else have properly conveyed in the PR description
• The change includes a GitHub Action to test the script(if it is possible to be added).
• No existing GitHub Actions are failing because of this change.

📚 Documentation

• README or help docs are updated for new features or changes.
• CLI help messages are meaningful and complete.

📁 File Hygiene & Output Handling

• No unintended files (e.g., logs, cache, temp files, pycache, output folders) are committed.

🛡️ Safety & Security

• No secrets or credentials are committed.
• Paths, shell commands, and environment handling are safe and portable.

🙌 Contribution Hygiene

• PR title and description are concise and clearly state the purpose of the change.
• Related issues (if any) are properly referenced using Fixes # or Closes #.
• All reviewer feedback has been addressed.

• Fixes Added new repo path but it is still adding the wrong path on windows #331