[ide-mode] Stream notifications when the active file changes #4147
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Summary of Changes
Hello @chrstnb, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request significantly enhances the VSCode IDE companion server by introducing support for resumable Model Context Protocol (MCP) sessions and enabling real-time streaming of the active file in the VS Code editor. These changes allow for more persistent and interactive communication between the IDE and MCP clients, providing a richer development experience.
Highlights
- Resumable Sessions: The Model Context Protocol (MCP) server now supports resumable sessions. This allows clients to establish a session, disconnect, and then reconnect using a session ID to continue their interaction, improving client-server communication persistence.
- Active File Streaming: A new MCP tool named
streamIDEStatehas been added to the VSCode IDE server. This tool enables real-time streaming of the currently active file's path in the VS Code editor to connected MCP clients, sending a notification whenever the active editor changes. - Server Refactoring for Session Management: The server's request handling logic has been refactored to manage multiple
StreamableHTTPServerTransportinstances, one for each active session. This change facilitates the new resumable session capability and enables dedicated streaming channels for notifications.
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Code Review
This pull request introduces session management to the VSCode IDE companion server, allowing for resumable sessions and a new tool to stream the active file path. A critical resource leak was identified due to improper handling of event listeners within sessions, along with high-severity issues related to an incorrect tool description and an inconsistent data structure in notifications. Suggestions have been provided to fix these issues to improve the stability and correctness of the implementation.
Code Coverage Summary
CLI Package - Full Text ReportCore Package - Full Text ReportFor detailed HTML reports, please see the 'coverage-reports-22.x' artifact from the main CI run. |
skeshive
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Jul 14, 2025
NTaylorMullen
previously approved these changes
Jul 15, 2025
skeshive
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Jul 15, 2025
mattKorwel
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Jul 15, 2025
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Co-authored-by: Scott Densmore <[email protected]>
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TLDR
In the VSCode extension-based MCP server, send notifications when the active file changes.
Dive Deeper
Returns structured data with { filePath } for now, but we can add additional listeners and data in a follow-up.
Also now supports resumable sessions.
Reviewer Test Plan
Test it with the inspector or any MCP client.
Testing Matrix
Linked issues / bugs
Progress on #3906