Title: open_colab_browser_connection only opens a new scratch notebook — cannot connect to an existing Colab session

[Jingzhen-Wang]

Problem: Fixed Scratch Notebook Constraint

The current open_colab_browser_connection tool always opens a hardcoded new scratch notebook. This creates several workflow bottlenecks:

• No Session Persistence: If a user already has a Colab notebook open—containing existing code, outputs, or a running runtime—there is no way to connect the local MCP server to that session.
• Impractical for Real Workflows: Users are forced to start from scratch every time, losing the context of their ongoing work.

Workaround & Implementation

To address this, I extended the functionality of the tool and added a manual fallback mechanism:

1. Enhanced open_colab_browser_connection

The tool now presents a macOS native dialog with two options:

• Empty Notebook: Maintains original behavior by opening a new scratch notebook.
• Existing Notebook URL: Prompts the user to paste a specific Colab URL. The tool then opens that notebook with the MCP connection token and port pre-filled in the URL fragment.

2. New get_colab_connection_info Tool

Added as a companion tool for manual fallback:

• Function: Returns the token and port as a single token&port string.
• Use Case: Allows users to copy-paste the credentials directly into Colab's "Connect to a local MCP server" dialog if the browser fails to open automatically.

Suggested Improvement

Allow open_colab_browser_connection to accept an optional notebook_url parameter.

This would enable agents (and users) to programmatically target an existing session rather than always defaulting to a new one, making the MCP integration significantly more flexible.