VS MCP Server

Let AI assistants like Claude control Visual Studio through the Model Context Protocol!

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🤔 What is this?

VS MCP Server exposes Visual Studio features through the Model Context Protocol (MCP), enabling AI assistants like Claude to interact with your IDE programmatically. Open files, read code, build projects, and more - all through natural conversation!

✨ Features

📂 Solution Tools

Tool	Description
solution_info	Get information about the current solution
solution_open	Open a solution file
solution_close	Close the current solution
project_list	List all projects in the solution
project_info	Get detailed project information

📝 Document Tools

Tool	Description
document_list	List all open documents
document_active	Get the active document
document_open	Open a file in the editor
document_close	Close a document
document_read	Read document contents
document_write	Write to a document
document_save	Saves an open document

✏️ Editor Tools

Tool	Description
selection_get	Get the current text selection
selection_set	Set the selection range
editor_insert	Insert text at cursor position
editor_replace	Find and replace text
editor_goto_line	Navigate to a specific line
editor_find	Search within documents

🔨 Build Tools

Tool	Description
build_solution	Build the entire solution
build_project	Build a specific project
clean_solution	Clean the solution
build_cancel	Cancel a running build
build_status	Get current build status

🧭 Navigation Tools

Tool	Description
goto_definition	Navigate to the definition of a symbol
find_references	Find all references to a symbol
symbol_document	Get all symbols defined in a document
symbol_workspace	Search for symbols across the solution

🐛 Debugger Tools

Tool	Description
debugger_status	Get current debugger state
debugger_launch	Start debugging (F5)
debugger_launch_without_debugging	Start without debugger (Ctrl+F5)
debugger_continue	Continue execution (F5)
debugger_break	Pause execution (Ctrl+Alt+Break)
debugger_stop	Stop debugging (Shift+F5)
debugger_step_over	Step over (F10)
debugger_step_into	Step into (F11)
debugger_step_out	Step out (Shift+F11)
debugger_add_breakpoint	Add a breakpoint at a file and line
debugger_remove_breakpoint	Remove a breakpoint
debugger_list_breakpoints	List all breakpoints
debugger_get_locals	Get local variables in current frame
debugger_get_callstack	Get the call stack

🔍 Diagnostics Tools

Tool	Description
errors_list	Read build errors, warnings, and messages from the Error List
output_read	Read content from an Output window pane
output_write	Write a message to an Output window pane
output_list_panes	List all available Output window panes

🛠️ Installation

Visual Studio Marketplace

1. Open Visual Studio 2022 or 2026
2. Go to Extensions > Manage Extensions
3. Search for "MCP Server"
4. Click Download and restart Visual Studio

Manual Installation

Download the latest .vsix from the Releases page and double-click to install.

🚀 Usage

▶️ Starting the Server

1. Open Visual Studio
2. Go to Tools > MCP Server > Start Server (or enable auto-start in settings)
3. The MCP server starts on http://localhost:5050

🤖 Configuring Claude Desktop & Claude Code

Add this to your Claude Desktop or Claude Code MCP settings (preferred HTTP method):

{
  "mcpServers": {
    "visualstudio": {
      "type": "http",
      "url": "http://localhost:5050"
    }
  }
}

Legacy SSE method (deprecated, but still supported):

{
  "mcpServers": {
    "visualstudio": {
      "type": "sse",
      "url": "http://localhost:5050/sse"
    }
  }
}

ℹ️ Note: The HTTP method is the preferred standard. SSE (Server-Sent Events) is a legacy protocol and should only be used for backward compatibility.

⚙️ Settings

Configure the extension at Tools > Options > MCP Server:

Setting	Description	Default
Auto-start server	Start the MCP server when Visual Studio launches	Off
Binding Address	Address the server binds to	localhost
HTTP Port	Port for the MCP server	5050
Server Name	Name reported to MCP clients	Visual Studio MCP
Log Level	Minimum log level for output	Information
Log Retention	Days to keep log files	7

🏗️ Architecture

+------------------+              +----------------------+   named pipes   +------------------+
|  Claude Desktop  |   HTTP/SSE  |  MCPServer.Server    | <-------------> |  VS Extension    |
|  (MCP Client)    | <---------> |  (MCP Server)        |    JSON-RPC     |  (Tool Impl)     |
+------------------+    :5050    +----------------------+                 +------------------+

🤝 Contributing

Contributions are welcome! Whether it's bug reports, feature requests, or pull requests - all feedback helps make this extension better.

🔧 Development Setup

1. Clone the repository
2. Open src/CodingWithCalvin.MCPServer.slnx in Visual Studio 2022
3. Ensure you have the "Visual Studio extension development" workload installed
4. Ensure you have .NET 10.0 SDK installed
5. Press F5 to launch the experimental instance

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

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👥 Contributors

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Made with ❤️ by Coding With Calvin