Add Streamlit 1.59.0 release notes and API docs (#1496)

* Add 1.59.0 release notes

Add Version 1.59.0 (July 6, 2026) to the release notes index as the
latest release and to the 2026 archive page.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Generate 1.59.2 docstrings in streamlit.json

Run generate.py with Streamlit 1.59.2 to add the 1.59 API docstrings.
Also removes the deleted SnowparkConnection entry from generate.py.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Fix: use 1.59.0 version key in streamlit.json

Co-authored-by: Cursor <cursoragent@cursor.com>

* Add API tiles for st.skeleton and ButtonColumn (1.59)

Add new detail pages, index tiles, and menu entries for st.skeleton
(status elements) and st.column_config.ButtonColumn (column config).

Co-authored-by: Cursor <cursoragent@cursor.com>

* Add screenshots for st.skeleton and ButtonColumn tiles

Co-authored-by: Cursor <cursoragent@cursor.com>

* Add API tile and page for MarkdownColumn (1.59)

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Johannes Rieke <johannes.rieke@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: 3 people

content/develop/api-reference/_index.md

@@ -1837,6 +1837,20 @@ with st.status('Running'):
   do_something_slow()
 ```
 
+</RefCard>
+<RefCard href="/develop/api-reference/status/st.skeleton">
+
+<Image pure alt="screenshot" src="/images/api/skeleton.jpg" />
+
+<h4>Skeleton</h4>
+
+Display a skeleton placeholder while loading.
+
+```python
+with st.skeleton(height=200):
+  do_something_slow()
+```
+
 </RefCard>
 <RefCard href="/develop/api-reference/status/st.toast">
 

content/develop/api-reference/data/column_config/_index.md

@@ -37,6 +37,19 @@ TextColumn("Widgets", max_chars=50, validate="^st\.[a-z_]+$")
 
 </RefCard>
 
+<RefCard href="/develop/api-reference/data/st.column_config/st.column_config.markdowncolumn">
+<Image pure alt="screenshot" src="/images/api/column_config.markdowncolumn.jpg" />
+
+<h4>Markdown column</h4>
+
+Configure a Markdown column.
+
+```python
+MarkdownColumn("Description", help="Supports **Markdown** text")
+```
+
+</RefCard>
+
 <RefCard href="/develop/api-reference/data/st.column_config/st.column_config.numbercolumn">
 <Image pure alt="screenshot" src="/images/api/column_config.numbercolumn.jpg" />
 
@@ -63,6 +76,19 @@ CheckboxColumn("Your favorite?", help="Select your **favorite** widgets")
 
 </RefCard>
 
+<RefCard href="/develop/api-reference/data/st.column_config/st.column_config.buttoncolumn">
+<Image pure alt="screenshot" src="/images/api/column_config.buttoncolumn.jpg" />
+
+<h4>Button column</h4>
+
+Configure a column of clickable buttons.
+
+```python
+ButtonColumn("Actions")
+```
+
+</RefCard>
+
 <RefCard href="/develop/api-reference/data/st.column_config/st.column_config.selectboxcolumn">
 <Image pure alt="screenshot" src="/images/api/column_config.selectboxcolumn.jpg" />
 

content/develop/api-reference/data/column_config/buttoncolumn.md

@@ -0,0 +1,8 @@
+---
+title: st.column_config.ButtonColumn
+slug: /develop/api-reference/data/st.column_config/st.column_config.buttoncolumn
+description: st.column_config.ButtonColumn configures a column of clickable buttons in dataframes and data editors, letting users trigger actions directly from table rows.
+keywords: st.column_config.ButtonColumn, button column, clickable buttons, dataframe buttons, interactive column, row actions, table buttons
+---
+
+<Autofunction function="streamlit.column_config.ButtonColumn" />

content/develop/api-reference/data/column_config/markdowncolumn.md

@@ -0,0 +1,8 @@
+---
+title: st.column_config.MarkdownColumn
+slug: /develop/api-reference/data/st.column_config/st.column_config.markdowncolumn
+description: st.column_config.MarkdownColumn configures a column that renders Markdown text inside dataframe and data editor cells.
+keywords: st.column_config.MarkdownColumn, markdown column, rendered markdown, dataframe markdown, rich text column, formatted text column
+---
+
+<Autofunction function="streamlit.column_config.MarkdownColumn" />

content/develop/api-reference/status/_index.md

@@ -56,6 +56,20 @@ with st.status('Running'):
   do_something_slow()
 ```
 
+</RefCard>
+<RefCard href="/develop/api-reference/status/st.skeleton">
+
+<Image pure alt="screenshot" src="/images/api/skeleton.jpg" />
+
+<h4>Skeleton</h4>
+
+Display a skeleton placeholder while loading.
+
+```python
+with st.skeleton(height=200):
+  do_something_slow()
+```
+
 </RefCard>
 <RefCard href="/develop/api-reference/status/st.toast">
 

content/develop/api-reference/status/skeleton.md

@@ -0,0 +1,8 @@
+---
+title: st.skeleton
+slug: /develop/api-reference/status/st.skeleton
+description: st.skeleton displays an animated loading placeholder, giving users visual feedback while content is loading.
+keywords: st.skeleton, skeleton, loading placeholder, loading animation, skeleton loader, loading state, placeholder
+---
+
+<Autofunction function="streamlit.skeleton" />

content/develop/quick-references/release-notes/2026.md

@@ -9,6 +9,63 @@ keywords: changelog, release notes, version history
 
 This page contains release notes for Streamlit versions released in 2026. For the latest version of Streamlit, see [Release notes](/develop/quick-reference/release-notes).
 
+## **Version 1.59.0**
+
+_Release date: July 6, 2026_
+
+**Highlights**
+
+- ✨ Introducing [`ButtonColumn`](/develop/api-reference/data/st.column_config/st.column_config.buttoncolumn) — a new column type for [`st.dataframe`](/develop/api-reference/data/st.dataframe) and [`st.data_editor`](/develop/api-reference/data/st.data_editor) that renders clickable buttons inside table cells, letting users trigger actions directly from a row ([#14544](https://github.com/streamlit/streamlit/pull/14544), [#7015](https://github.com/streamlit/streamlit/issues/7015)).
+- 📊 [`st.dataframe`](/develop/api-reference/data/st.dataframe) has a new column statistics submenu — right-click any column header to see per-column summary stats ([#14307](https://github.com/streamlit/streamlit/pull/14307), [#13148](https://github.com/streamlit/streamlit/issues/13148)).
+- 🍿 Introducing [`st.skeleton`](/develop/api-reference/status/st.skeleton) — a new element that renders animated loading placeholders, making it easy to give users visual feedback while content is loading ([#15169](https://github.com/streamlit/streamlit/pull/15169), [#8032](https://github.com/streamlit/streamlit/issues/8032)).
+- 🎛 [`st.chat_input`](/develop/api-reference/chat/st.chat_input) has a new `submit_mode` parameter that lets you control when messages are submitted — either on Enter (default) or only when the user explicitly clicks the send button ([#14344](https://github.com/streamlit/streamlit/pull/14344), [#8323](https://github.com/streamlit/streamlit/issues/8323), [#11854](https://github.com/streamlit/streamlit/issues/11854)).
+
+**Notable Changes**
+
+- 📋 [`st.dataframe`](/develop/api-reference/data/st.dataframe) and [`st.data_editor`](/develop/api-reference/data/st.data_editor) support a new [`MarkdownColumn`](/develop/api-reference/data/st.column_config/st.column_config.markdowncolumn) type in `st.column_config` that renders Markdown text inside table cells ([#13931](https://github.com/streamlit/streamlit/pull/13931), [#10211](https://github.com/streamlit/streamlit/issues/10211)).
+- 🎨 [`st.markdown`](/develop/api-reference/text/st.markdown) now renders Mermaid diagrams, letting you embed flowcharts, sequence diagrams, and more directly in your app ([#14022](https://github.com/streamlit/streamlit/pull/14022), [#10721](https://github.com/streamlit/streamlit/issues/10721)).
+- 🔗 [`st.markdown`](/develop/api-reference/text/st.markdown) has a new `anchors` parameter for adding linkable heading anchors to Markdown content ([#15722](https://github.com/streamlit/streamlit/pull/15722), [#13913](https://github.com/streamlit/streamlit/issues/13913)).
+- 💻 You can now launch Streamlit apps directly with `python app.py` or `uv run app.py` using the new `App.run()` entry point — no more `streamlit run` required ([#15563](https://github.com/streamlit/streamlit/pull/15563), [#9450](https://github.com/streamlit/streamlit/issues/9450), [#11420](https://github.com/streamlit/streamlit/issues/11420)).
+- 🧩 [`st.fragment`](/develop/api-reference/execution-flow/st.fragment) can now write to containers defined outside the fragment. Fragments can update any part of your app — including elements created before the fragment — without triggering a full rerun ([#15623](https://github.com/streamlit/streamlit/pull/15623), [#15620](https://github.com/streamlit/streamlit/pull/15620), [#10481](https://github.com/streamlit/streamlit/issues/10481)).
+- 📎 [`st.chat_input`](/develop/api-reference/chat/st.chat_input) now supports pasting files directly into the input field ([#15558](https://github.com/streamlit/streamlit/pull/15558), [#10307](https://github.com/streamlit/streamlit/issues/10307)).
+- 🤖 [`st.write_stream`](/develop/api-reference/write-magic/st.write_stream) now supports OpenAI Responses API streams in addition to the existing Chat Completions streams ([#15559](https://github.com/streamlit/streamlit/pull/15559), [#11061](https://github.com/streamlit/streamlit/issues/11061)).
+- 🔒 [`st.set_page_config`](/develop/api-reference/configuration/st.set_page_config) supports a new `"locked"` option for `initial_sidebar_state` that prevents users from toggling the sidebar open or closed ([#15459](https://github.com/streamlit/streamlit/pull/15459), [#15411](https://github.com/streamlit/streamlit/issues/15411)).
+- 💅 Widgets have a new `persist_state` parameter for finer control over how widget state is preserved across reruns ([#15645](https://github.com/streamlit/streamlit/pull/15645)).
+- 📷 [`st.camera_input`](/develop/api-reference/widgets/st.camera_input) has a new `resolution` parameter to control the captured image resolution ([#15766](https://github.com/streamlit/streamlit/pull/15766), [#4320](https://github.com/streamlit/streamlit/issues/4320)).
+- 🧪 [`AppTest`](/develop/api-reference/app-testing/st.testing.v1.apptest) now supports testing `st.download_button` and `st.image` ([#15528](https://github.com/streamlit/streamlit/pull/15528), [#9003](https://github.com/streamlit/streamlit/issues/9003)).
+- 💾 Programmatic secrets now support list values ([#15491](https://github.com/streamlit/streamlit/pull/15491)).
+- ⌨ You can now look up Streamlit API documentation from the CLI with `streamlit docs <command>` ([#15547](https://github.com/streamlit/streamlit/pull/15547)).
+- 🔐 A new `server.xsrfCookieSameSite` config option lets you customize the `SameSite` attribute of the XSRF cookie for deployments with specific cross-site requirements ([#15634](https://github.com/streamlit/streamlit/pull/15634), [#5793](https://github.com/streamlit/streamlit/issues/5793), [#9397](https://github.com/streamlit/streamlit/issues/9397)).
+- 💡 Streamlit now recommends installing AI coding skills on app startup to improve your development workflow with AI coding assistants ([#15437](https://github.com/streamlit/streamlit/pull/15437), [#15473](https://github.com/streamlit/streamlit/pull/15473)).
+- ⚙ The `/_stcore/metrics` endpoint now reports memory stats in a less detailed (cheaper) form by default. If your monitoring stack relies on the previous granular memory fields, set `server.enableStaticServing` to `true` to restore them ([#15472](https://github.com/streamlit/streamlit/pull/15472)).
+- 👻 The deprecated Snowpark connection type has been removed. Migrate to a supported connection type ([#15784](https://github.com/streamlit/streamlit/pull/15784)).
+- 👻 The deprecated [`st.bokeh_chart`](/develop/api-reference/charts/st.bokeh_chart) command has been removed. Use `st.components.v1.html` to embed Bokeh visualizations instead ([#15636](https://github.com/streamlit/streamlit/pull/15636)).
+
+**Other Changes**
+
+- ⚡ VegaLite charts now use Vega's native resize API for faster rendering when the container size changes ([#15302](https://github.com/streamlit/streamlit/pull/15302)).
+- 🎨 The pagination widget's selected-state styling has been redesigned ([#15550](https://github.com/streamlit/streamlit/pull/15550)).
+- 🔧 Various fixes related to the Baseweb library removal ([#15737](https://github.com/streamlit/streamlit/pull/15737)).
+- 🐛 Bug fix: The metrics endpoint no longer errors when SQLAlchemy connections are present ([#15334](https://github.com/streamlit/streamlit/pull/15334)).
+- 🦋 Bug fix: `@st.fragment(run_every=...)` no longer raises a `TypeError` in `_run_with_thread_state` ([#15376](https://github.com/streamlit/streamlit/pull/15376)).
+- 🪲 Bug fix: Named Snowflake connections defined in config files are now correctly discovered and used ([#15382](https://github.com/streamlit/streamlit/pull/15382)).
+- 🐜 Bug fix: P-mode PIL palette images are now hashed correctly to prevent hash collisions ([#15397](https://github.com/streamlit/streamlit/pull/15397)).
+- 🐝 Bug fix: The server now correctly binds to IPv6 dual-stack wildcards for the default address ([#15400](https://github.com/streamlit/streamlit/pull/15400)).
+- 🐞 Bug fix: Stale and invalid auth cookies are now cleared on login ([#15420](https://github.com/streamlit/streamlit/pull/15420)).
+- 🕷️ Bug fix: `widgetMgr` is synced correctly to fix lazy loading in `tab.open` ([#15460](https://github.com/streamlit/streamlit/pull/15460)).
+- 🪳 Bug fix: Installed Custom Component v2 components are now correctly discovered in `AppTest` ([#15488](https://github.com/streamlit/streamlit/pull/15488)).
+- 🪰 Bug fix: [`st.pills`](/develop/api-reference/widgets/st.pills) and [`st.segmented_control`](/develop/api-reference/widgets/st.segmented_control) callbacks now fire correctly after selection ([#15522](https://github.com/streamlit/streamlit/pull/15522)).
+- 🦠 Bug fix: The page title is no longer reset to the default on rerun ([#15527](https://github.com/streamlit/streamlit/pull/15527)).
+- 🦟 Bug fix: The "Missing Submit Button" warning no longer flashes briefly on app load ([#15561](https://github.com/streamlit/streamlit/pull/15561)).
+- 🦂 Bug fix: Streamlit now defaults to the polling file watcher in WSL environments, avoiding inotify issues ([#15562](https://github.com/streamlit/streamlit/pull/15562)).
+- 🦗 Bug fix: `AppTest` now correctly handles formatted labels in `format_func` widgets ([#15564](https://github.com/streamlit/streamlit/pull/15564)).
+- 🕸️ Bug fix: The invalid session upload error message now explains multi-replica deployment as a possible cause ([#15635](https://github.com/streamlit/streamlit/pull/15635)).
+- 🐌 Bug fix: [`st.selectbox`](/develop/api-reference/widgets/st.selectbox) no longer loses its selection when `format_func` depends on object identity ([#15639](https://github.com/streamlit/streamlit/pull/15639)).
+- 🦎 Bug fix: Pressing Escape no longer clears the current selection in [`st.multiselect`](/develop/api-reference/widgets/st.multiselect) ([#15646](https://github.com/streamlit/streamlit/pull/15646)).
+- 🦀 Bug fix: `StreamlitPage` now validates that its `source` matches the registered page, catching misconfiguration earlier ([#15721](https://github.com/streamlit/streamlit/pull/15721), [#10572](https://github.com/streamlit/streamlit/issues/10572)).
+- 👽 Bug fix: [`st.dataframe`](/develop/api-reference/data/st.dataframe) no longer intercepts the Ctrl+F keyboard shortcut when the search bar is disabled ([#15764](https://github.com/streamlit/streamlit/pull/15764)).
+- 🐛 Bug fix: Column headers in [`st.dataframe`](/develop/api-reference/data/st.dataframe) no longer wrap text in the column header menu ([#15772](https://github.com/streamlit/streamlit/pull/15772)).
+
 ## **Version 1.58.0**
 
 _Release date: May 28, 2026_