SST Release Notes

Core

Improvements

Added an Up Arrow shortcut to close the subagent picker when the first item is selected.

Desktop

Bugfixes

Fixed home page scrolling so sticky headers and the session list behave correctly.

Fixed startup readiness so WSL server loading is included before the desktop app reports ready.

Removed the inactive help button from the app layout.

Fixed custom agent selector visibility when custom agents are available.

Improvements

Home page command palette search can now find and open sessions.

Core

Bugfixes

Stopped subagents from launching nested subagents by default, with a configurable subagent_depth limit when needed.

Improved default reasoning depth for Meta models.

Desktop

Improvements

Added Mod+N as another shortcut for opening a new tab.

Bugfixes

Restored the Help button in release builds.

Kept sessions with null archive times visible instead of dropping them from the home list.

Hid the drawer close button on Windows where it conflicts with the window chrome.

Thank you to 1 community contributor:

@BB-84C:

fix(core): tolerate AlreadyExists in FSUtil.ensureDir (#36542)

Desktop

Improvements

Completed the Desktop v2 migration, including upgrade handling for the new layout and first-launch onboarding.

Added a setting to switch between the new and old Desktop layouts during the transition period.

Bugfixes

Fixed file views using the wrong background in the v2 layout.

Fixed connected project picker positioning when its anchor is still loading.

Kept permission auto-accept state separate for each server.

Fixed a project picker positioning crash.

Kept terminal tab rename focused while editing.

Enabled remote sessions to auto-accept permissions correctly.

Fixed terminal tabs stealing focus when they mount.

Loaded more timeline history at once to reduce repeated backfill while scrolling.

Resynced the timeline correctly after reconnecting.

Preserved the composer caret after request updates.

Reduced Home cold-load time substantially.

Preserved timeline bottom anchoring more reliably.

Clarified status indicator severity.

Core

Bugfixes

Supported OpenAI pro reasoning mode.

Disabled response storage by default for xAI Responses. (@geraint0923)

Added OAuth support for Luna Responses Lite.

Switched to another available org after logging out in the console.

Used Codex context limits for GPT-5.6 over OAuth. (@nabilfreeman)

TUI

Bugfixes

Forwarded CLI environment variables to the TUI worker.

Desktop

Bugfixes

Removed interface transition changes that were accidentally shipped to dev.

Fixed clipped labels and branch tooltips.

Stopped the review panel width from jumping when opening or closing it.

Focused the prompt input when starting a new session.

Prevented some new-session updates from blocking the UI.

Fixed timeline outlines getting clipped.

Aligned context token counts with usage totals.

Kept the file tree visible while opening files.

Improvements

Redesigned attachment cards and file comment chips in the new interface.

Updated the review panel with persistent file browsing, better file tabs, and easier open-in-app actions.

Restyled the Edit Project modal to match the new interface.

Added middle-click to open sessions in a new tab.

Added a temporary setting to switch between the old and new interface.

Added per-prompt model selection in the composer.

Polished the new interface styling across the session view and terminal.

Thank you to 2 community contributors:

@nabilfreeman:
fix(openai): use codex context limits for gpt-5.6 (#36248)

@geraint0923:
fix(xai): default store to false for Responses (#36629)

Core

Bugfixes

Exposed reasoning effort variants for Grok models.

Improved xAI prompt cache routing and PDF file support in Responses models.

Desktop

Improvements

Added an Open containing folder action for projects on the home screen.

Added a composer add menu for files, commands, context, and shell mode without losing draft text.

Added a provider setup tip on new sessions when no external providers are connected.

Remember review panel mode and selected file per session.

Added inline file browser tabs for opening and previewing files from the side panel.

Updated desktop translations.

Bugfixes

Kept the review pane usable on wide screens by reserving its minimum width.

Fixed hidden session panes staying mounted and causing side-panel glitches.

Routed legacy drafts back to the session page.

Loaded full review diffs for large patches when the initial diff is capped.

Removed the first-open flash in the command palette.

Routed the new session shortcut through tabs in the new layout.

Kept session routes inside the correct layout when opening legacy session URLs.

Core

Bugfixes

• Better classify Z.ai context-window overflow errors so oversized requests surface the right failure mode (@fengjikui)
• Handle unavailable config directories more gracefully when reading config files

Desktop

Improvements

• Restore model details tooltips in the model picker (@arvsrn)
• Refresh the v2 command palette to better match the rest of the new desktop UI (@arvsrn)

Bugfixes

• Make terminal shortcuts take priority when the terminal is focused
• Show unread state on tabs with pending questions
• Keep session tab titles available after reloads while session data is still loading
• Apply theme changes only after you select them in Settings
• Fix macOS titlebar appearance mismatches in Sequoia and adjust traffic light placement (@arvsrn)

Thank you to 3 community contributors:

@arvsrn:

• feat(app): align cmd k menu with v2 styles (#35152)
• feat(app): visual improvements (#35134)
• feat(app): reintroduce model context tooltip in model selector (#35087)
• feat(app): change traffic light position, fix sequoia bug (#35081)

@StarpTech:

• fix(core): expand home-relative permission paths (#35737)

@fengjikui:

• fix(llm): classify zai token limit overflow (#35671)

Core

Improvements

Added a code mode MCP adapter for running confined orchestration scripts against connected MCP tools.

Hid the execute tool unless code mode is enabled.

Bugfixes

Fixed paginated MCP tool catalogs losing tool metadata and output schema validation.

Preserved low reasoning effort for OpenRouter small-model variants instead of disabling it.

Fixed GitHub Copilot model routing to honor each model's advertised chat or responses endpoint.

Fixed session lists to match equivalent instance directories reliably.

Fixed Cerebras reasoning replay so earlier assistant reasoning is sent back in the provider-supported field.

TUI

Bugfixes

Fixed spinner registration so loading indicators keep rendering across TUI surfaces.

Desktop

Improvements

Show draft server status in the title bar.

Unified the provider connect flow across the app.

Improved the integrated terminal experience. (@arvsrn)

Added reopening for closed tabs and background tab opening. (@usrnk1)

Improved model search in picker dialogs. (@arvsrn)

Added recently closed projects to Home. (@usrnk1)

Made tab navigation respond on mouse down in the new layout.

Overhauled the v2 review panel. (@arvsrn)

Refined the session tab preview popover. (@usrnk1)

Bugfixes

Fixed new sessions from Home using the wrong project.

Fixed first-launch onboarding so it only appears when appropriate.

Improved large review pane performance.

Fixed timeline loads that started on assistant replies by backfilling the missing user turn.

Restored typing in the composer while the window is unfocused.

Fixed dropdown search behavior. (@arvsrn)

Kept the v2 review pane mounted when switching session tabs.

Kept the terminal mounted when switching session tabs in a workspace.

Fixed session tab busy indicators to stay scoped to the correct server.

Fixed child-session navigation and lineage resolution during tab transitions.

Kept desktop window tabs after closing and reopening the app.

Thank you to 3 community contributors:

@usrnk1:

feat(desktop): refine session tab preview popover (#34792)

feat(desktop): add recently closed projects to home (#34926)

feat(desktop): papercut fixes (#34939)

feat(desktop): reopen closed tabs and background tab open (#35010)

@arvsrn:

feat(app): v2 review panel overhaul (#31882)

feat(app): align subagent UI with v2 (#34931)

feat(app): improvements to model search (#34954)

feat(app): dropdown search fix (#34961)

feat(app): terminal improvements (#34747)

@StarpTech:

feat(tui): add debug info dialog with copy to clipboard (#35004)

Core

Bugfixes

Force reasoning mode for OpenAI-compatible reasoning models so reasoning settings apply reliably on custom deployments

Stop replaying stale GitHub Copilot response item IDs, avoiding follow-up request failures

Desktop

Bugfixes

Let question prompts be minimized and restored without dismissing them (@arvsrn)

Clean up stale empty and old draft store files to reduce desktop state buildup

Keep pending question requests open while reviewing them, instead of dismissing them accidentally (@eXamadeus)

Keep session page failures scoped to the affected tab instead of breaking the whole app

Improvements

Improve markdown and message layout alignment in the v2 session UI (@arvsrn)

Add a searchable v2 model picker and model management flow in the composer (@arvsrn)

Show a hover preview for session tabs with the project, path, branch, and server (@usrnk1)

Streamline WSL server setup with clearer distro checks and install flows (@arvsrn)

Keep desktop tabs scoped to each window so windows restore their own tab sets

Thank you to 3 community contributors:

@arvsrn:

feat(app): v2 wsl ui (#34233)

feat(app): composer improvements (#34720)

feat(app): more v2 ui alignment (#34465)

feat(app): minor fixes (#34748)

@eXamadeus:

fix(app): question UI fixes and UX improvements (#34116)

@usrnk1:

feat(desktop): session tab hover preview popover (#34678)

feat(desktop): improve markdown heading spacing in session timeline (#34738)