Greptile Summary

This PR successfully isolates scheduled background tasks into dedicated hidden browser windows, preventing interference with the user's visible browser sessions. The implementation includes:

• Hidden Window Lifecycle: Scheduled tasks now create a hidden browser window at session start, which is automatically closed when the task completes or the session is deleted
• Context Isolation: The agent receives a properly scoped browserContext with the hidden windowId and pageId, ensuring all operations stay within the isolated window
• Prompt Customization: The system prompt conditionally injects scheduled task instructions that disable tab grouping and guide the agent to use the correct window/page IDs
• UI State Management: The scheduled tasks page now derives the viewing run from storage, keeping the dialog in sync with live updates
• Race Condition Prevention: Both onFinish and deleteSession handlers properly set hiddenWindowId = undefined before closing the window, preventing double-close attempts

The changes are well-structured, with proper separation of concerns and consistent error handling throughout.

Confidence Score: 5/5

• This PR is safe to merge with no critical issues found
• The implementation is well-designed with proper lifecycle management, error handling, and race condition prevention. The hidden window cleanup is handled in both completion and deletion paths, with proper guards against double-close. The prompt modifications correctly scope the agent's behavior for scheduled tasks, and the UI improvements enhance real-time visibility.
• No files require special attention

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant User
    participant ChatV2Service
    participant Browser
    participant AiSdkAgent
    participant Session
    
    User->>ChatV2Service: processMessage(isScheduledTask=true)
    
    alt New Session
        ChatV2Service->>Browser: createWindow({hidden: true})
        Browser-->>ChatV2Service: {windowId}
        ChatV2Service->>Browser: newPage('about:blank', {windowId})
        Browser-->>ChatV2Service: pageId
        ChatV2Service->>ChatV2Service: Create browserContext with windowId, pageId
        ChatV2Service->>AiSdkAgent: create(browserContext)
        AiSdkAgent->>AiSdkAgent: buildSystemPrompt(isScheduledTask, windowId)
        AiSdkAgent-->>ChatV2Service: agent
        ChatV2Service->>Session: store(agent, hiddenWindowId, browserContext)
    end
    
    ChatV2Service->>AiSdkAgent: appendUserMessage(messageContext)
    ChatV2Service->>AiSdkAgent: stream response
    AiSdkAgent-->>User: Execute task in hidden window
    
    AiSdkAgent->>ChatV2Service: onFinish callback
    ChatV2Service->>Session: Set hiddenWindowId = undefined
    ChatV2Service->>Browser: closeWindow(windowId)
    
    alt deleteSession called
        User->>ChatV2Service: deleteSession()
        ChatV2Service->>Session: Get hiddenWindowId
        ChatV2Service->>Session: Set hiddenWindowId = undefined
        ChatV2Service->>Browser: closeWindow(windowId)
        ChatV2Service->>Session: delete()
    end

_{Last reviewed commit: 7af229a}

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