Cursor 3.0: Agents Window, Design Mode, and Parallel Execution

TL;DR

• Cursor 3 ships with a new Agents Window for running multiple agents in parallel across repos, worktrees, and remote SSH
• Design Mode lets you annotate UI elements directly in the browser for precise agent feedback
• Agent Tabs let you view multiple chats side-by-side; worktree and best-of-n commands moved from Editor to Agents Window
• 8 bug fixes including improved diff rendering, markdown parsing, and prompt resumption

New

• Agents Window — Run many agents in parallel across local repos, worktrees, cloud, and remote SSH in a single interface centered around agent workflows.
• Design Mode — Annotate and target UI elements directly in the browser (⌘+Shift+D to toggle). Use Shift+drag to select areas, ⌘+L to add elements to chat, ⌥+click for input.
• Agent Tabs — View multiple chats side-by-side or in a grid layout within the Agents Window.
• /worktree command — Create isolated git worktrees so changes happen in isolation without affecting the main branch.
• /best-of-n command — Run the same task in parallel across multiple models in isolated worktrees, then compare outcomes.
• MCP structured content — MCP Apps now support richer tool outputs with structured content.
• Improved browser automation — Reduced tool surface, tightened subagent focus, better error handling, and screenshot-based coordinate clicking as fallback.
• Large-file diff rendering — Significantly faster, smoother, and less memory-intensive.

Changed

• Worktree and best-of-n moved — Native worktree support and best-of-n selection moved from Editor to Agents Window with improved UX for managing multiple workspaces.
• Cloud agents removed from Editor — Cloud agent functionality no longer available in the Editor interface.
• Third-party plugin imports — Now default to off for Enterprises when unset (explicit Admin overrides still respected).
• Early Access consolidated — Early Access release track merged behind Nightly.

Fixed

• Text area behavior for Network Access Controls — Enter key now reliably adds newlines at input end.
• Multi-root workspace hooks — Project hook files now read from all workspace folders, not just the first.
• Markdown parsing — Fixed bug where parenthesized HTTP(S) links were misread as citations.
• Todo card visibility — Cards no longer disappear after all todos complete.
• Agent queued prompts — Now resume automatically after editing operations.
• Model picker styling — Removed misleading "not allowed" styling for disabled but selectable models; auto-enables when selected.
• Thinking blocks — Expanding/collapsing now works while streaming is in progress.
• Shift+Enter line breaks — Now correctly treated as multiline content in prompt input field.

To upgrade: Open Cursor and install the latest version. Access Agents Window with Cmd+Shift+P → Agents Window. Read the full announcement for more details.

Source: Cursor