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Summary
CODEX_CLI_PATHshutil.which("codex")for regular CLI installationsRoot cause
On Microsoft Store Codex Desktop installations,
shutil.which("codex")can resolve to a packaged executable underC:\Program Files\WindowsApps. That path is discoverable but cannot necessarily be launched by the installer's Python child process, causingPermissionError: [WinError 5] Access is deniedduring MCP registration.Codex Desktop already exports the actual callable CLI through
CODEX_CLI_PATH; the installer was not consulting it.User impact
install.cmdnow works from Codex Desktop without requiring users to manually prepend the internal CLI directory toPATH. Existing standalone Codex CLI installations retain the previous PATH-based behavior.Validation
uv run --with-editable . --with pytest pytest -q test/test_install_mcp_script.py— 8 passedgit diff --checkCloses #74