Changelog

Agent questions and background tasks

The agent can ask you questions mid-task, and everything running in the background now shows up in one place.

New

• Agent questions — the agent can stop and ask you up to four questions at once: multiple choice, yes/no or free text. The card sits above the composer, so you can pick an option, type your own answer, or skip.

Improved

• Background tasks — background commands and solver runs now show in the same card as subagents, and you can cancel each one on its own.
• Activity icons — agents and tasks that are running in the background get a slower, quieter animation, so you can tell them apart from the agent that's working right now.

Fixed

• Hiding the right pane (Cmd+L) with the explorer or search docked no longer pops them open as a floating window.

Improved Plugin UI & Reliability Fixes

Improved plugin catalog UI, introduced MATLAB and KiCad plugins, and refreshed mesh viewers.

New

• Plugin search — the Plugins page has one search box, a Plugins / Skills switch, and filters for category and status.
• MATLAB plugin — works with MATLAB and Simulink, with nothing to install inside MATLAB.
• KiCad plugin (beta) — review, check and edit KiCad boards from the agent.
• Drop preview — dragging in the file explorer shows exactly where the file will land.

Improved

• Altium plugin — the agent can run any Altium menu command (DRC, Update PCB, autorouting, outputs) and set board outlines.
• Catalog plugins — GitHub, Linear, Notion, Atlassian and Sentry now install from the catalog. If you already had them, they carry over and stay on or off as you left them.
• STL and MSH viewers — redesigned to match the STEP and NVPOST viewers.

Fixed

• New installs start in Accept Edits mode, not Bypass, so shell commands ask first.
• Onshape exports from the agent work again.
• Improved agent responses to failed tool calls.
• File search no longer shows duplicates from nested git checkouts.
• The bug report form warns you when the description is too long, instead of failing on send.
• Error on corrupted OpenFOAM case instead of crashing.

Better CAD imports and smoother conversations

Faster STEP imports, easier-to-read long prompts, and more reliable chat interactions — alongside the improvements from 0.5.1 and 0.5.2.

Improved

• STEP imports — models open faster, and files containing a mix of solids, standalone sheets and free faces retain more of their geometry. Incomplete previews show missing-face warnings instead of silently losing geometry.
• Long prompts — large messages stay in expandable input cards with Show more / Show less controls, so you can preview, expand and edit the full prompt.
• Image attachments — large images are resized before sending and rotated to the correct orientation. Oversized image decodes are rejected to limit memory use, and images that exceed the message budget are skipped with an explanation.
• Tooltips — hints scale with text zoom, and shortcut labels match the action and your operating system.

Fixed

• Editing and resending an earlier message works while a response is streaming, including just after pressing Stop.
• Returning to the chat from Settings, Plugins or Solvers puts keyboard focus back in the composer.
• A failed optional plugin connection no longer blocks sending a message while it reconnects in the background.
• Word-delete shortcuts work in multi-line text fields, including bug reports, custom instructions and the plugin skill editor.
• Very small CAD models, including sub-millimetre geometry, can be selected in the viewer.
• The Usage chart no longer leaves a model-breakdown overlay covering the bars; daily breakdowns remain available on hover, with a colour key below the chart.

Bug fixes and new plugins

New

• Microsoft 365 connectors — connect your work account to use Outlook (search and read mail, save drafts and replies, list and create calendar events), Microsoft Teams (read and post in chats and channels) and OneDrive & SharePoint (search and read files).

• Slack — connect a Slack workspace and let the agent search, read and post in your channels, and read your direct messages. Search covers the public channels you are in.

• Altium Designer (Beta) — Windows only. With Altium open, the agent can read your schematics and boards, cross-probe a part or net, pull the design out as data, and review it against datasheets before fabrication.

• Google Calendar and Gmail — list your calendars and events, find a free time across attendees and change events; and search, read and draft Gmail. Both run on Google's own servers, which are still in preview, so they may not connect for every account yet.

• Report a bug — a bug button in the threads sidebar footer.

• Models — Claude Sonnet 5.5 joins the model picker, with a 1M-token context and adaptive thinking. DeepSeek V4 Pro has been retired; DeepSeek V4.1 Flash is unchanged.

Improved

• Thread age — each sidebar row now shows how old the thread is.
• Recent projects — the workspace chip above the composer has a dropdown of recent projects for one-click switching.
• CAD Viewer — .step and .stp files open in an improved CAD Viewer tab

Fixed

• Improved stability and reliability of the new agent harness.
• Stop now takes effect on screen immediately, and a model change the backend rejected is retried instead of being dropped.
• If Prism was force-quit, the next launch could stall for up to two minutes before your plugins were ready; they now reconnect immediately.
• If Prism quit unexpectedly, the next launch now says so and links to the log.
• On Windows, running the prism CLI with no Prism open spawned hundreds of copies of itself.
• Numpad keys did not work in the agent chat on Windows.
• A plugin waiting on a sign-in read as "Added"; it now shows "Not signed in", and six plugins show their proper names again.
• On a plugin's sign-in row, two Cancel buttons could appear at once.
• The agent could not copy skill templates into the workspace.
• Collapsing a conversation group did not reset its "Show more", so reopening it stayed fully expanded.
• Light themes: the composer border was too faint, and the tab drop-zone preview was invisible.

Reworked command palette and Smartsheet

A rebuilt command palette, a Smartsheet connector, and solver runs in the background-tasks list — plus fixes for the @-mention popup, the diff view, and long chats with many images.

New

• Smartsheet — read and write sheets and workspaces by connecting a Smartsheet API token. Requires a Smartsheet Business, Enterprise, or Advanced Work Management plan.
• Command palette — Cmd+K is rebuilt: filter pills for agents, commands, files, plugins and skills, and every shortcut a row shows now runs that row.
• Background solver tasks — solver runs, structural (Ferro) solves and runtime installs appear in the background-tasks pill at the bottom of the chat, with progress.

Fixed

• The @-mention popup flickered and collapsed while typing.
• Chats with many attached images stopped sending once they hit the model provider's size limit; the oldest images are now left out of the replayed request instead.
• The thread diff view saturated a CPU core on long threads.
• The built-in browser on macOS reported an outdated Safari version, which broke sign-in on some sites.

Plugin catalog and split terminals

Browse and install plugins (including Onshape) from inside Prism, tile terminals and browsers next to your files, and pick from a wider set of models in a simpler picker.

Highlights

Plugin catalog

Browse, install and remove plugins from the redesigned Plugins page. Each plugin has its own page with a preview of its skills, and new plugins appear without a restart. New in the catalog: Onshape, GitLab, LangSmith, monday.com, Context7 and DeepWiki. You can also ask the agent to install or manage plugins for you — it asks for your approval first.

Onshape integration

Connect your Onshape account through Navier AI, then let the agent browse your documents and export STEP files straight into your project. Your Onshape credentials are never stored on your machine.

Split panes for terminals and browsers

Terminals and browser tabs now split, move and resize just like file tabs, so you can keep a shell, a docs page and a model open side by side.

New

• More models — Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5, GPT-6, DeepSeek V4.1 Flash (the new default), DeepSeek V4 Pro, Kimi K3, GLM 5.3 FlashX and Grok 4.7, with provider logos in the picker.
• Model and effort picker — model and reasoning effort are now one dropdown that always shows the effort in use.
• Usage by model — Settings → Usage breaks each day's tokens down by model, with tokens, calls and cost.
• Plugin mentions — @-mentioned plugins show as inline chips with their icons, in the composer and in sent messages.
• Background commands — watch live output from running background commands in the chat panel, and cancel them from there.
• Profile menu — your avatar and name in the threads sidebar, with Account, Sign out, Docs and Settings.
• Switching computers — if your account is already connected on another machine, Prism asks before moving the connection to this one.
• Rounded corners on Windows 11 — the Prism window now matches native Windows 11 windows.

Improved

• Large STEP assemblies — much faster to import, and reopening them is near-instant.
• Long chats — long conversations scroll smoothly.
• Background threads — the agent keeps running solvers, browser actions and other app tools while you work in a different chat.
• Many connected plugins — the agent looks up plugin tools as it needs them, so hundreds of tools no longer crowd the conversation.
• Plugin activity — repeated calls to the same plugin collapse into one expandable row.
• @-mention popup — spans the full composer, lists enabled plugins and recent files first, and uses the same fuzzy matching as quick open.
• Composer layout — attach, permission mode and background commands on the left; model and context usage on the right.
• Attached images — show as previews in the chat instead of a list of filenames.
• Agent behavior — checks its saved or exported files before saying it's done, and gives Windows and Linux shortcuts on those platforms.
• Plugin updates — a newer bundled plugin replaces an older installed copy, and missing plugins reinstall automatically.
• Updates on macOS — explains how to fix an update that fails because Prism is running from a read-only location.
• Windows title bar — dragging works reliably and the window buttons are the standard Windows ones.
• macOS app icon — now the same size as other apps in the Dock.
• Model lineup — older models (Claude Opus 4.8, Sonnet 4.6, Haiku 4.5, GPT-5.5, Grok 4.3) have been retired in favor of the newer versions above.

Fixed

• The built-in browser failed to start on Windows when Prism was installed in Program Files.
• Japanese and other non-Latin text showed as boxes in the Windows editor.
• Bold links showed their asterisks as part of the link.
• Long file paths overlapped the controls in the thread diff header.
• The PDF page-number box lost focus as soon as you clicked it.
• STL/OBJ meshes were clipped in tall, narrow panes, and Reset View didn't fix it.
• Windows showed macOS (⌘) shortcut hints in Settings and the file explorer.
• The error banner's Dismiss button was hard to click and could be pushed off-screen.
• Session search showed an internal name instead of "sessions".
• The custom instructions box in Settings → Agent showed as a white box in dark themes.
• Ctrl+C didn't dismiss the agent's question card on Windows and Linux.