Computer Use now rejects Python runtimes below 3.9 before running pip,
keeps Pillow on the Python 3.9-compatible 11.x line, and falls back from
the configured mirror to the default PyPI index when dependency installs
fail.
Constraint: Pillow 11.3 requires Python 3.9+, while user machines may resolve a different Python than expected
Rejected: Downgrade Pillow to the Python 3.8-compatible 10.x line | current product direction assumes modern Python installs
Confidence: high
Scope-risk: narrow
Directive: Keep runtime package ranges aligned with the setup Python minimum before changing either side
Tested: bun test src/server/__tests__/computer-use-api.test.ts src/server/__tests__/computer-use-requirements.test.ts src/server/__tests__/computer-use-python.test.ts src/utils/computerUse/pipInstall.test.ts
Tested: bun run check:server
Tested: bun run check:coverage
Tested: bun run check:policy
Not-tested: Real Windows 10 machine dependency install against the reported user environment
Computer Use setup could fail on machines where PATH discovery misses a valid Python installation, especially Windows or conda-style environments. Store an optional interpreter path, prefer it during environment checks and venv creation, and expose a desktop settings control for selecting or clearing it.
Constraint: Python discovery is environment-specific and cannot always be inferred from PATH.
Rejected: Continue falling back to PATH after an invalid custom path | hides a user-selected broken interpreter and makes diagnosis ambiguous.
Confidence: high
Scope-risk: moderate
Directive: Preserve unknown Computer Use config fields and keep blank interpreter paths normalized to automatic detection.
Tested: bun test src/utils/computerUse/preauthorizedConfig.test.ts src/server/__tests__/computer-use-python.test.ts src/server/__tests__/computer-use-api.test.ts
Tested: cd desktop && bun run test src/pages/ComputerUseSettings.test.tsx
Tested: cd desktop && bun run lint
Tested: cd desktop && bun run build
Tested: Computer Use browser smoke saved /opt/homebrew/bin/python3 and backend persisted then reset pythonPath to null
Not-tested: Full bun run check:server; existing cron-scheduler-launcher test expects CLAUDE_CODE_ENTRYPOINT=sdk-cli but received undefined.
Related: https://github.com/NanmiCoder/cc-haha/issues/331
