marimo Files

Highlights ⭐

🧮 Tables: small touches that go a long way. We're continuing to craft a delightful user experience for working with dataframes and tables.

Every table now comes with an expandable column viewer that lets you drill down into their data distribution:

https://github.com/user-attachments/assets/c6b03205-c781-4b23-bea3-06c58b71dd8b

You can now adjust the page size with a dropdown:

🤖 Improved AI chat experience. Our AI-powered chatbot — which knows about your data! — now supports reasoning tokens and persists chat history.

https://github.com/user-attachments/assets/3f6920cc-fbce-4519-99fe-9b3bc08859d9

📦 Install package extras with our UI.

https://github.com/user-attachments/assets/056f158a-67ec-44e9-b297-5704042305b5

🐻‍❄️ Polars execution plans, with mermaid diagrams. Polars lazy-frames now produce an explain graph using mermaid.

⚡️ Connection state. Improved backend connection detection and disabled editor features until connected.

Many stability improvements and bug fixes.

What's Changed

• tidy: store cleanup by @dmadisetti in https://github.com/marimo-team/marimo/pull/5121
• chore(deps): update to ai-sdk/react (useChat import), isLoading → status by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5127
• improvement: improve uv projects detection by @mscolnick in https://github.com/marimo-team/marimo/pull/5123
• chore: cleanup config passing to HTML from server by @mscolnick in https://github.com/marimo-team/marimo/pull/5120
• fix: sync activeChatId with messages when creating new thread or switching threads by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5130
• docs: make contributing docs succinct by @winstxnhdw in https://github.com/marimo-team/marimo/pull/5128
• docs: add example notebook link for slides layout by @Haleshot in https://github.com/marimo-team/marimo/pull/5138
• fix: just exit on non-interactive terminals by @mscolnick in https://github.com/marimo-team/marimo/pull/5126
• feat: add ai chat persistence between sessions by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5141
• docs: update watching.md to reflect support for data file watching by @Haleshot in https://github.com/marimo-team/marimo/pull/5137
• fix: handle json duckdb datatype by @mscolnick in https://github.com/marimo-team/marimo/pull/5144
• improvement: notebook schema serialization by @mscolnick in https://github.com/marimo-team/marimo/pull/5131
• Minor correction in fileformat.py by @killickm in https://github.com/marimo-team/marimo/pull/5149
• docs: fix image rendering in carousel preview by @Haleshot in https://github.com/marimo-team/marimo/pull/5148
• improvement: selectable row viewer by @Light2Dark in https://github.com/marimo-team/marimo/pull/5147
• feat: add mo.image_compare() | image comparison slider by @Haleshot in https://github.com/marimo-team/marimo/pull/5091
• chore(deps): update build tools by @renovate in https://github.com/marimo-team/marimo/pull/5049
• chore(deps): update dependency hvplot to ~=0.11.3 by @renovate in https://github.com/marimo-team/marimo/pull/5151
• chore(deps): update dependency boto3 to >=1.38.26 by @renovate in https://github.com/marimo-team/marimo/pull/5150
• feat: add frontend schema for redshift by @Light2Dark in https://github.com/marimo-team/marimo/pull/5140
• feat: add redshift engine by @Light2Dark in https://github.com/marimo-team/marimo/pull/5132
• improvement: marimo converters to/from various formats by @mscolnick in https://github.com/marimo-team/marimo/pull/5146
• security: Create policy and thank previous reporters by @dmadisetti in https://github.com/marimo-team/marimo/pull/5162
• feat: add reasoning tokens in chat panel and reasoning support for anthropic by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5159
• fix: add cell ids to deserialize by @mscolnick in https://github.com/marimo-team/marimo/pull/5165
• fix: add cell ids to deserialize by @mscolnick in https://github.com/marimo-team/marimo/pull/5166
• Add mechanism for injecting custom file stores by @pepijndevos in https://github.com/marimo-team/marimo/pull/5161
• fix: skew potection token in run-mode when auth is enabled by @mscolnick in https://github.com/marimo-team/marimo/pull/5168
• fix: broken CI with mac anthropic by @dmadisetti in https://github.com/marimo-team/marimo/pull/5173
• feat: allow env level app overrides by @dmadisetti in https://github.com/marimo-team/marimo/pull/5172
• chore: publish dev to test-pypi by @mscolnick in https://github.com/marimo-team/marimo/pull/5174
• chore: publish dev to test-pypi by @mscolnick in https://github.com/marimo-team/marimo/pull/5175
• fix: CI pass by @dmadisetti in https://github.com/marimo-team/marimo/pull/5177
• fix: inline favicon by @mscolnick in https://github.com/marimo-team/marimo/pull/5181
• Create ipynb fixtures for marimo convert and snapshot outputs by @manzt in https://github.com/marimo-team/marimo/pull/5179
• fix(anthropic): set temperature = 1 for extended-thinking models by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5190
• feat: add ai reasoning tokens and other parts persistence between sessions by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5191
• chore: add tests for sql function by @Light2Dark in https://github.com/marimo-team/marimo/pull/5189
• chore(convert): Move _transform_sources tests to snapshot-based tests by @manzt in https://github.com/marimo-team/marimo/pull/5194
• Add support for initial chart properties in data_explorer (take 2) by @janosh in https://github.com/marimo-team/marimo/pull/5171
• Use runtime assertions instead of type assertions by @manzt in https://github.com/marimo-team/marimo/pull/5208
• Support some JupyterBook cell tags in marimo convert by @manzt in https://github.com/marimo-team/marimo/pull/5169
• improvement: allow for different backends by @mscolnick in https://github.com/marimo-team/marimo/pull/5187
• feat: Skip undo delete toast for empty cells by @manzt in https://github.com/marimo-team/marimo/pull/5209
• chore: add suspense for terminal by @Light2Dark in https://github.com/marimo-team/marimo/pull/5211
• Default to uv package manager when launched from uv by @manzt in https://github.com/marimo-team/marimo/pull/5213
• docs (ai completion): add instructions for Ollama by @tobiasschweizer in https://github.com/marimo-team/marimo/pull/5212
• Discover uv executable with UV environment variable by @manzt in https://github.com/marimo-team/marimo/pull/5215
• fix: Skip PEP 723 check on directories by @manzt in https://github.com/marimo-team/marimo/pull/5216
• Modify docs for readability and consistency by @gublit in https://github.com/marimo-team/marimo/pull/5222
• fix: home edit mode with separated backend by @dmadisetti in https://github.com/marimo-team/marimo/pull/5235
• fix(deps): update codemirror dependencies by @renovate in https://github.com/marimo-team/marimo/pull/5225
• chore: update ai model list by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5232
• chore: upgrade ai backend from google-generativeai (deprecated) -> google-genai by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5226
• fix: add reasoning config only if is reasoning model by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5221
• chore: remove old feature flags by @Light2Dark in https://github.com/marimo-team/marimo/pull/5241
• improvement: condense / cleanup static banner by @mscolnick in https://github.com/marimo-team/marimo/pull/5245
• fix: table cell styles index error by @Light2Dark in https://github.com/marimo-team/marimo/pull/5253
• feat: add MarkdownRenderer to ReasoningAccordion by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5248
• feat: change page size in tables directly by @Light2Dark in https://github.com/marimo-team/marimo/pull/5243
• fix: disable charts for > max_rows without vegafusion by @Light2Dark in https://github.com/marimo-team/marimo/pull/5224
• feat: Render mermaid-based (optimized) query plan for pl.LazyFrame by @manzt in https://github.com/marimo-team/marimo/pull/5247
• feat: runtime config link fix by @dmadisetti in https://github.com/marimo-team/marimo/pull/5256
• chore(google): updated mo.ui.chat to use google-genai instead of google-generativeai by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5258
• improvement: handle waiting until connection is healthy by @mscolnick in https://github.com/marimo-team/marimo/pull/5259
• fix: don't block when writing auto-export files by @mscolnick in https://github.com/marimo-team/marimo/pull/5254
• chore: upgrade to react 19 by @Light2Dark in https://github.com/marimo-team/marimo/pull/5249
• fix: (outlines) Headings with the same name are highlighted multiple… by @jo-soft in https://github.com/marimo-team/marimo/pull/5176
• docs: add numfocus affiliation by @akshayka in https://github.com/marimo-team/marimo/pull/5267
• fix: centering/aligning of file-button by removing flex-grow by @mscolnick in https://github.com/marimo-team/marimo/pull/5266
• style: improve page size input styles by @Light2Dark in https://github.com/marimo-team/marimo/pull/5264
• docs: make numfocus logo smaller, add to docs homepage by @akshayka in https://github.com/marimo-team/marimo/pull/5268
• chore: remove context provider & update types (react 19) by @Light2Dark in https://github.com/marimo-team/marimo/pull/5252
• fix: allow authToken in mount config by @mscolnick in https://github.com/marimo-team/marimo/pull/5269
• chore: add defaults to table args by @mscolnick in https://github.com/marimo-team/marimo/pull/5263
• feat: Allow selecting optional "extras" for missing packages by @manzt in https://github.com/marimo-team/marimo/pull/5260
• feat: Allow black/white list in extensions by @dmadisetti in https://github.com/marimo-team/marimo/pull/5271
• Make async data states impossible to misrepresent in useAsyncData by @manzt in https://github.com/marimo-team/marimo/pull/5272
• fix: types error in test by @Light2Dark in https://github.com/marimo-team/marimo/pull/5275
• fix: handle edit message bug by @bjoaquinc in https://github.com/marimo-team/marimo/pull/5274
• fix: add suspense to prevent screen flicker for col-explorer & datasources chart by @Light2Dark in https://github.com/marimo-team/marimo/pull/5273
• fix: graceully handle other url protocols by @mscolnick in https://github.com/marimo-team/marimo/pull/5278
• fix: anywidget remote url by @mscolnick in https://github.com/marimo-team/marimo/pull/5279
• styles: diagnostics padding by @mscolnick in https://github.com/marimo-team/marimo/pull/5277
• fix: suspense on terminal by @mscolnick in https://github.com/marimo-team/marimo/pull/5283
• feat: enhance ImportError handling for better package suggestions by @manzt in https://github.com/marimo-team/marimo/pull/5281
• improvement: connecting indicator and readonly tooltip by @mscolnick in https://github.com/marimo-team/marimo/pull/5284
• fix: allow for base url redirects by @dmadisetti in https://github.com/marimo-team/marimo/pull/5287
• docs: emphasize generate with ai by @akshayka in https://github.com/marimo-team/marimo/pull/5289
• Fixed typo in dataflow.py (ampltitude -> amplitude) by @jogloran in https://github.com/marimo-team/marimo/pull/5288
• readme: fix link by @akshayka in https://github.com/marimo-team/marimo/pull/5290
• chore: biome 2x by @mscolnick in https://github.com/marimo-team/marimo/pull/5291
• fix: snapshot by @mscolnick in https://github.com/marimo-team/marimo/pull/5292
• Adding some extra module names by @koaning in https://github.com/marimo-team/marimo/pull/5295
• style: don't wrap page size input when cell is too small by @Light2Dark in https://github.com/marimo-team/marimo/pull/5301
• improvement: make our file-explorer more compatible with s3 mount by @mscolnick in https://github.com/marimo-team/marimo/pull/5286
• fix: WS are static on creation by @dmadisetti in https://github.com/marimo-team/marimo/pull/5294
• nit: connecting copy in the editor by @akshayka in https://github.com/marimo-team/marimo/pull/5305
• docs: link to repo in docs by @akshayka in https://github.com/marimo-team/marimo/pull/5306
• docs: ipynb snapshots working with expensive notebooks by @akshayka in https://github.com/marimo-team/marimo/pull/5307
• feat: cell range selection for tables (v2) by @Light2Dark in https://github.com/marimo-team/marimo/pull/5296
• fix: undefined errors that may crop up before kernel is fully instantiated by @dmadisetti in https://github.com/marimo-team/marimo/pull/5313
• fix: wait for connection on more requests by @mscolnick in https://github.com/marimo-team/marimo/pull/5314
• fix: more waiting for connection logic by @mscolnick in https://github.com/marimo-team/marimo/pull/5316
• style: datasource icons dark mode by @Light2Dark in https://github.com/marimo-team/marimo/pull/5317
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in https://github.com/marimo-team/marimo/pull/5315
• fix: version init by @mscolnick in https://github.com/marimo-team/marimo/pull/5324
• fix: more Supsense in more places by @mscolnick in https://github.com/marimo-team/marimo/pull/5325
• fix: show wasm always always connected by @mscolnick in https://github.com/marimo-team/marimo/pull/5331
• fix: merge default config on save_user_config by @mscolnick in https://github.com/marimo-team/marimo/pull/5330
• fix: dark mode charts and json viewer crashing by @Light2Dark in https://github.com/marimo-team/marimo/pull/5332
• fix: invalidate importlib cache after requirecheck fails by @mscolnick in https://github.com/marimo-team/marimo/pull/5328
• Extend view-as URI parameter to handle app view in edit mode by @harterrt-shopify in https://github.com/marimo-team/marimo/pull/5327
• chore: disable cell range selection for release by @mscolnick in https://github.com/marimo-team/marimo/pull/5334
• tests: fix ibis datatype drift by @mscolnick in https://github.com/marimo-team/marimo/pull/5333
• fix: reasonable session and notebook merge by @dmadisetti in https://github.com/marimo-team/marimo/pull/5335
• fix: disable run when not connected by @mscolnick in https://github.com/marimo-team/marimo/pull/5342

New Contributors

• @winstxnhdw made their first contribution in https://github.com/marimo-team/marimo/pull/5128
• @killickm made their first contribution in https://github.com/marimo-team/marimo/pull/5149
• @pepijndevos made their first contribution in https://github.com/marimo-team/marimo/pull/5161
• @tobiasschweizer made their first contribution in https://github.com/marimo-team/marimo/pull/5212
• @gublit made their first contribution in https://github.com/marimo-team/marimo/pull/5222
• @jo-soft made their first contribution in https://github.com/marimo-team/marimo/pull/5176
• @jogloran made their first contribution in https://github.com/marimo-team/marimo/pull/5288
• @harterrt-shopify made their first contribution in https://github.com/marimo-team/marimo/pull/5327

Full Changelog: https://github.com/marimo-team/marimo/compare/0.13.15...0.14.0