Code review

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Greptile Summary

This PR consolidates BrowserOS interaction modes by defaulting to agent mode and simplifies the onboarding experience. The changes include:

• Unified BrowserOS suggestions: Removed the conditional display logic that showed different icons and labels for chat vs agent mode. All suggestions now display "Ask BrowserOS:" with a Sparkles icon, while the underlying mode still differentiates behavior.
• Default mode change: Changed the default suggestion mode from chat to agent in useBrowserOSSuggestions, aligning with the product direction to emphasize agent capabilities.
• Simplified onboarding examples: Refactored the "Try it" button handlers in StepThree to use the simpler openSidePanelWithSearch messaging function instead of the complex runExample implementation that was removed. Updated the chat mode example query to "Summarize this page" (from "summarize today's news").
• Development workflow improvement: Modified agent-sdk package.json to use source files during development while maintaining proper dist file references for published packages via publishConfig.

The changes maintain functional correctness while simplifying the codebase and improving the developer experience.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are straightforward refactorings and simplifications that maintain existing functionality. The mode logic still works correctly in the underlying code (as seen in NewTab.tsx), only the UI presentation was simplified. The onboarding refactor removes unused code without breaking functionality, and the package.json change is a valid development workflow improvement.
• No files require special attention

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant User
    participant NewTab as NewTab Page
    participant Onboarding as Onboarding Step 3
    participant Suggestions as useBrowserOSSuggestions
    participant SidePanel as Side Panel
    participant Chrome as Chrome API

    Note over User,Chrome: New Tab Search Flow
    User->>NewTab: Types query in search
    NewTab->>Suggestions: Get BrowserOS suggestions
    Suggestions-->>NewTab: Returns [{mode: 'agent', message: query}]
    NewTab->>NewTab: Renders "Ask BrowserOS:" with Sparkles icon
    User->>NewTab: Selects suggestion
    NewTab->>SidePanel: openSidePanelWithSearch('open', {query, mode: 'agent'})
    SidePanel->>Chrome: Opens side panel with query

    Note over User,Chrome: Onboarding Try It Flow
    User->>Onboarding: Clicks "Try it" button (Chat Mode)
    Onboarding->>Chrome: chrome.tabs.create({url: 'https://news.google.com'})
    Chrome-->>Onboarding: New tab created
    Onboarding->>Onboarding: Wait 1500ms
    Onboarding->>SidePanel: openSidePanelWithSearch('open', {query: 'Summarize this page', mode: 'chat'})
    SidePanel->>Chrome: Opens side panel with query

    User->>Onboarding: Clicks "Try it" button (Agent Mode)
    Onboarding->>Chrome: chrome.tabs.create({url: 'about:blank'})
    Chrome-->>Onboarding: New tab created
    Onboarding->>Onboarding: Wait 500ms
    Onboarding->>SidePanel: openSidePanelWithSearch('open', {query: 'Navigate to amazon.com and order tide pods', mode: 'agent'})
    SidePanel->>Chrome: Opens side panel with query