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Cursor Router, Plugins & Side Chats

🌌 Cursor Agent & MCP Features 15 min 500 BASE XP

What Shipped After Cursor Agent updates

Cursor keeps shipping between numbered releases. Three verified additions since July 2026: an intelligent request router behind Auto, parallel "side chat" conversations with full transcript search, and a new wave of first-party plugins.

Cursor Router: A Smarter Auto

Cursor Router is the model-routing system behind Auto. Not every request needs frontier-level intelligence, so the router runs a classifier on each agent request and sends it to the model that fits the task - fast, efficient models for simple work, the most capable models for the hard stuff. Open the model picker, select Auto, and choose an Optimize For mode:

ModeWhat It DoesBilling
CostThe original Auto routing logic - optimizes token spendBundled Auto pricing
BalanceOptimizes for intelligence, speed, and cost togetherRouted model's rate (~2x Cost)
IntelligenceRoutes to the most capable models for harder tasksRouted model's rate (~2-4x Cost)

Admins configure Router from the team dashboard: turn it on or off (per organization group on Enterprise), restrict which modes members can pick, choose whether the routed model's name is shown, and optionally lock everyone to Auto. The TypeScript and Python SDKs expose it as model id auto-smart with an optimize_for parameter.

Requirement: Router needs a powerful-yet-cheap fallback model, so Grok 4.5 must be enabled for your team. It's on by default for Teams plans; Enterprise admins must turn it on manually.

Side Chats & Conversation Search

Type /side, /btw, or click the + button at the top of the chat panel to open a side chat - a full, durable agent conversation that runs alongside your main thread without interrupting it. Side chats inherit context from the main chat, default to reading/searching/answering (not editing), and can be @-mentioned to pull findings back into the main conversation.

Inside the Agents Window, the command palette (Ctrl+K, distinct from the editor's Inline Edit shortcut) now searches agent transcripts across thousands of past conversations; Ctrl+F searches within the conversation you're currently viewing.

New Plugins: Google Workspace

The Cursor Marketplace added first-party plugins connecting agents directly to Google Drive (search, open, download, and organize files), Gmail (search/read mail, draft and send messages, manage labels and threads), and Google Calendar (read schedules, create/update events, find free time) - install them from the Marketplace or the Customize page.

Key Insight: The pattern repeats across all three releases - Cursor keeps turning single-purpose surfaces (a model dropdown, a chat window, a settings page) into something the agent itself can reason about and act through.
SYNAPSE VERIFICATION
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What does Cursor Router do?
Replaces Auto with one fixed model
Runs a classifier on each Auto request and routes it to the model that best fits the task
Only works with Claude models
Disables all frontier models