Hook/plugin API gains session.version

Use it now No documentation found New Features

JSON All of v2.1.281

Use it nowTier: how much it should matter to you

3Useful: my rating, 1 to 5

2Signal: worth watching, 1 to 5

PluginsArea: what it touches

New FeaturesKind: in v2.1.281, 23 Sep 26

What probably matters to youSection of the release

What

Plugins, add-ons that extend Claude Code, can call a set of runtime methods. session.version is added to that set, and the plugin client offers it as version().

Why

A plugin can now ask for a version through this call.

Read from

Names in the bundlesession.version

How sure we are

Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.

The writer flagged doubtThe finding does not say which version `session.version` returns.

Anthropic's release notes agreeAdded a scrollbar to the /skills, /mcp and /plugin Installed lists in fullscreen mode, like the one /workflows now has: it appears while the…

See this entry in the whole of v2.1.281 →

The build it came inv2.1.281

23 Sep 2026 · 1,065 entries, this one is #45.

Use it now39
You'll notice261
Nothing to try yet26
Under the hood217

Either side of it

v2.1.280Older
v2.1.282Newer

Open the release →

Names in this entry

settingsession.version
Plugins can now call session.version
settingversion
Internal build versions get trimmed before metrics are sent, so daily builds report one value.

Anthropic's notes

Upstream's own release notes for v2.1.281 name something this entry names, so the two are probably about the same change. Probably: the pairing is made on a shared name rather than on the words around it.

Added a scrollbar to the /skills, /mcp and /plugin Installed lists in fullscreen mode, like the one /workflows now has: it appears while the mouse is over the list and can be clicked or dragged
Fixed the /plugin Errors tab showing no confirmation after its last error is resolved
Fixed /plugin starting a second uninstall or update of the same plugin when Enter was pressed again while the first was still running
Fixed a y held while /plugin checks a marketplace source adding the marketplace the instant the "Add marketplace?" question appears, before it can be read
Fixed the selected tab in tabbed dialogs (/config, /plugin, /permissions) showing no highlight while the tab bar has focus when color is off (NO_COLOR)
Fixed the mouse wheel over the /plugin Installed list scrolling the pane behind it instead of the list
Fixed lists such as a skill's state options in /plugin not being answerable by typing a number in screen-reader mode
Improved the / menu, /skills, /context and the /plugin Installed list to show skills synced from claude.ai by their short name when no other command uses it, not anthropic-skills:<name>
Improved /install-github-app, /desktop, the /permissions auto mode environment prompts, and the /plugin "Add marketplace?" and "Run this command?" prompts: they now use the standard dialog frame with key hints, and Ctrl+C or Ctrl+D cancels them on the second press like other dialogs
Improved the /plugin plugin and marketplace details menus and the /remote-control already-connected menu: they now support Home/End and clicking a row
Improved the /plugin Installed list: rows now line up in columns (status, name, type, details) across every section
Changed claude plugin uninstall --json and the /plugin dialog to say a plugin's data was kept when its folder stays because another installed plugin uses it or install records cannot be read

Is this right?

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.1.226 Version bump to 2.1.226
Both mention version
v2.1.257 New Artifact tool "version" action
Both mention version
v2.1.265 New artifact document versioning guidance text
Both mention version