feat: add --index-url support for private package registries #35
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juan-abia
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DouweM
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Jan 12, 2026
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Add support for custom package index URLs to allow installing dependencies from private registries. The --index-url CLI option can be repeated multiple times to specify multiple indexes, which are tried in order before PyPI. Changes: - Add --index-url CLI argument with action='append' for multiple indexes - Add index_urls parameter to run_mcp_server(), prepare_deno_env(), async_prepare_deno_env(), and code_sandbox() - Pass index_urls through Deno/TypeScript layer to micropip.install() - Update README with usage examples Usage: uvx mcp-run-python --index-url https://private.repo.com/simple --deps pkg stdio Python API: async with code_sandbox( dependencies=['pkg'], index_urls=['https://private.repo.com/simple'] ) as sandbox: await sandbox.eval('import pkg')
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- Always pass indexUrls to prepare_env (even if empty), matching how dependencies are handled - Add repeatable --dep flag alongside existing --deps for CLI consistency with --index-url - Mark --deps as deprecated but keep it working for backwards compatibility
micropip treats empty list [] differently from None - with [] it doesn't fall back to PyPI. Using 'index_urls or None' ensures empty lists are converted to None so PyPI fallback works correctly.
DouweM
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Jan 14, 2026
mcp_run_python/deno/src/main.ts
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| --return-mode <xml/json> Return mode for output data (default: xml)`, | ||
| --port <port> Port to run the HTTP server on (default: 3001) | ||
| --deps <deps> Comma separated list of dependencies to install | ||
| --index-urls <urls> Comma separated list of package index URLs (tried in order before PyPI) |
Contributor
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Slightly surprising they're not repeatable singular args here. I guess its not that important for these to be consistent, but see if you can make it so without too much effort
- Update README.md examples to use --dep (repeatable) instead of --deps - Hide --deps from CLI help (argparse.SUPPRESS) - Add DeprecationWarning when --deps is used - Keep --deps working for backwards compatibility
- Add --dep and --index-url as repeatable args in Deno CLI (using collect) - Update Python main.py to pass --dep= and --index-url= instead of comma-separated - Add deprecation warnings when --deps or --index-urls are used - Update Deno help text to show new args - Keep backwards compatibility for old comma-separated format - Add test for repeatable --dep flag
- test_cli_dep_multiple: test multiple --dep flags (--dep numpy --dep pydantic) - test_cli_dep_and_deps_combined: test combining --dep and --deps - test_cli_deps_deprecation_warning: verify deprecation warning is emitted
DouweM
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Jan 16, 2026
| console.warn('Warning: --deps is deprecated, use --dep instead (can be repeated)') | ||
| } | ||
| if (flags['index-urls']) { | ||
| console.warn('Warning: --index-urls is deprecated, use --index-url instead (can be repeated)') |
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We don't need this do we? 😄
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Add support for custom package index URLs to allow installing dependencies from private registries. The --index-url CLI option can be repeated multiple times to specify multiple indexes, which are tried in order before PyPI.
Changes:
Usage:
uvx mcp-run-python --index-url https://private.repo.com/simple --deps pkg stdioPython API:
async with code_sandbox( dependencies=['pkg'], index_urls=['https://private.repo.com/simple'] ) as sandbox: await sandbox.eval('import pkg')