marimo Files

This release introduces several conveniences for exploring and visualizing in-memory objects, along with bug fixes.

✨ Highlights

Inspect objects with mo.inspect()

This release adds a new mo.inspect() utility inspired by rich.inspect, providing a way to explore Python objects interactively within marimo notebooks (#5936).

Shows attributes, methods, and documentation in a structured format instead of unhelpful <object at 0x...> output.

Improved ibis integration

Ibis tables now render using marimo's native formatters (#5855), and there is now support for Ibis catalogs, enabling multi-database queries (#5978). Thanks to community member @kyrre for both contributions!

Enhanced AI context

Better @ completions for variables, dataframes, and SQL tables within chat and AI cells (#5962).

Cross-cell variable deletion

You can now use del to delete variables from other cells to reclaim memory (#5966). Cells that delete a variable automatically depend on all cells that reference it. This should be considered an advanced feature but can be useful for memory-intensive workflows with large datasets or tensors.

🚨 Breaking changes

• Sandbox mode now explicitly requires a notebook file (#5511)

marimo edit --sandbox now raises a UsageError when run without specifying a notebook file. Previously, sandbox mode allowed editing multiple notebooks but they would share the same environment, breaking isolation and potentially poisoning the shared venv. Multi-notebook sandboxing may be supported in the future with better-defined behavior.

✨ Enhancements

• Ibis catalogs (#5978)
• AI context registry + codemirror decorated resources (#5962)
• Allow deleting variables defined by other cells (#5966)
• Add mo.inspect for rich object introspection (#5936)
• Recursive key completion (#5922)
• Formatters for Ibis objects (#5855)
• Enable Ctrl+[ vim escape on Windows (#5914)
• Opinionated formatters work on subclasses. improve searching perf for formatters (#5899)
• Editable columns in data editor (#5848)
• Add smart limits and file count display to mo.ui.file_browser (#5882)
• Reorganize runtime settings in user configuration menu (#5891)
• Support hiding code in setup cells (#5852)
• Improve cache for anywidget (#5879)

🐛 Bug fixes

• Allow builtin functions to be hashed for cache (#5994)
• Keep box-shadow CSS definitions on single lines (#5985)
• Make it possible to close open snippet (#5954)
• Revert logic for steps in tracing-chart (#5968)
• Allow caching on embedded apps (#5957)
• As_html for svg and add tests (#5947)
• Formatter for 'type()' and make ibis formatters opinionated (#5948)
• Do not run create __marimo__/cache by default (#5910)
• Improved robustness of cache wrapper in module contexts (#5873)
• Bin step was too small for large bin values (#5924)
• Normalize line endings in HTTP responses for Windows generated scripts (#5916)
• Forward config parameter from plotly fig.show() (#5880)
• Find first directory parent for __file__ in mo.notebook_dir (#5906)
• Fix Windows multiprocessing test hanging after pytest path fix (#5903)
• Fix __file__ in embedded notebooks (#5854)
• Handle double interruptions (#5892)
• Performant charts doesn't show stats (#5874)
• Add fallback to csv for col summaries (#5871)

📚 Documentation

• Expound upon mo.cache expectations and limitations (#5917)
• Rename "CODE" to "PYTHON" in cell type selector UI (#5913)
• Add a video for lazy execution (#5890)
• Advise that a new vs code extension is coming soon (#5878)
• Document working with marimo notebooks in existing projects (#5839)

📝 Other changes

• Remove dead code (#5997)
• Update polars and revert test changes (#5987)
• Migrate to Tailwind CSS v4 (#5979)
• Refactor frontend request layer to use dependency injection (#5971)
• Allow dangerous sandbox to be set with an environment variable (#5958)
• Update codemirror dependencies (#5951)
• Don't include traceback in session deserialzation (#5915)
• Inline-completions parsing issue (#5931)
• Skip mcp requirements if no tools are enabled (#5902)
• Refactor pending delete service with reducer pattern (#5900)
• Refactor CellArray/Cell to use atom-based state management (#5897)

Contributors

Thanks to all our community and contributors who made this release possible: @akshayka, @AnirudhDagar, @bjoaquinc, @davidangarita1, @dmadisetti, @kyrre, @Light2Dark, @manzt, @mscolnick, @thliang01, @zilto.

And especially to our new contributors:

• @AnirudhDagar made their first contribution in https://github.com/marimo-team/marimo/pull/5882
• @davidangarita1 made their first contribution in https://github.com/marimo-team/marimo/pull/5879

Full Changelog: https://github.com/marimo-team/marimo/compare/0.14.16...0.14.17