marimo-team/marimo 0.19.3

on GitHub

This release introduces isolated sandbox environments for multi-notebook directories and migrates our AI integrations to pydantic-ai for improved reliability with modern LLM providers.

What's Changed

Multi-Notebook Sandboxed Home

You can now run marimo edit --sandbox directory/ to open a folder of notebooks where each notebook runs in its own isolated sandbox environment. This means:

• Every notebook automatically gets its own virtual environment with its own dependencies
• Dependencies are managed per-notebook using PEP 723 inline script metadata
• Each notebook remains reproducible and self-contained

This is useful when working on multiple notebooks with different dependency requirements, or for maintaining a collection of standalone, shareable notebooks.

# Open a directory with per-notebook isolation
marimo edit --sandbox ./notebooks/

uvx --with pyzmq marimo edit --sandbox ./notebooks/

See our guide on sandboxed home and inlining dependencies guide for more details on sandboxed notebooks.

AI Provider Migration to pydantic-ai

We've migrated our AI integrations to use pydantic-ai, which brings several improvements:

• Better model support: Fixed issues with newer OpenAI models (GPT-5, Codex models) that require the Responses API and max_completion_tokens parameter
• Improved timeout handling: Resolved timeout issues when connecting to remote Ollama instances and other providers
• Support for more providers: Added support for providers like Mistral that aren't fully OpenAI-compatible
• Better error handling: More informative error messages when AI requests fail

This is a behind-the-scenes change that improves reliability—your existing AI configuration should continue to work without changes

✨ Enhancements

• Migrate AI providers to pydantic-ai (#7732)
• Add custom AI providers in config (#7771)
• Support custom models returning vercel chunks (#7797)
• Add [tool.marimo.venv].path to specify a specific venv (#7821)
• Support images mimebundling in auto export for ipynb (#7825)
• Allow for __contains__ and __getitem__ in anywidget (#7846)
• Clarify column filtering is only for top 30 values (#7840)
• Update connecting alert to show a spinner and banner notification (#7839)
• Include errors with ipynb exports (#7811)
• Runtime configuration tooltips, docs (#7819)
• Parse indented code blocks (#7817)
• Don't steal focus when embedded in an iframe (#7798)
• Auto-close curly braces within strings (#7759)
• When previewing ibis tables in interactive mode, also include SQL and repr tabs (#7757)
• Sandboxed home (#7702)
• Ensure Plotly area chart is reactive (#7761)

🐛 Bug fixes

• Keep rich objects in chat message (#7851)
• Ibis Deferred expression object will not be handeled as datasource (#7801)
• Duplicate notebook when running 'marimo edit ' (#7841)
• Fix mo.ui.dataframe showing incorrect column count (#7845)
• Start remote connection in a Connecting state (#7838)
• Escape key should not prevent exiting to Vim mode (#7812)
• Keep terminal mounted to preserve session across tab switches (#7833)
• Enhance keyboard handling in editable name cell component (#7818)
• Fix reactive Plotly heatmap selection with datetime axes (#7805)
• Limit private variable rename to current cell (#7814)
• More defensive edge cases when adding packages to inline metadata (#7813)
• Ensure repr_mimebundle handles empty include/exclude parameters gracefully (#7787)
• Fixes chat config not updating (#7808)
• Fix opencode duplicate tokens bug (#7792)
• Return empty string if no tabs (#7772)
• Setup cell (#7778)

📚 Documentation

• Document mo.ui.plotly support for bar and heatmap (#7769)

📝 Other changes

• Update react-aria dependencies (#7822)

Contributors

Thanks to all our community and contributors who made this release possible: @akshayka, @alonsosilvaallende, @andrewsoonqn, @AnirudhDagar, @dmadisetti, @koaning, @Light2Dark, @mscolnick, @NickCrews, @nojaf, @pepijndevos, @Ravinlathigra, @szst11

• @NickCrews made their first contribution in #7757
• @alonsosilvaallende made their first contribution in #7787

Full Changelog: 0.19.2...0.19.3