windbg-mcp-rs

windbg-mcp-rs is a pure WinDbg extension DLL that exposes the current debugging session as an MCP server.

• Read official WinDbg command documentation extracted from docs/debugger.chm
• Execute WinDbg commands through dbgeng
• Interrupt a running target from MCP
• Use the server from any MCP client over Streamable HTTP

Screenshots

Quick Start

1. Build the DLL

cargo build --release

2. Load it in WinDbg

.load path\to\windbg_mcp_rs.dll

3. Start the MCP server

!mcp serve 127.0.0.1:50051

The MCP endpoint will be:

http://127.0.0.1:50051/mcp

4. Connect your MCP client

Point your client to:

http://127.0.0.1:50051/mcp

WinDbg Commands

Use !mcp help to list all plugin commands.

Common ones:

!mcp help
!mcp serve 127.0.0.1:50051
!mcp status
!mcp stop

What MCP Exposes

• Resources: static WinDbg command documentation
• Tools: executable debugger actions such as raw command execution, catalog search, and target interrupt
• Prompts: guidance templates for using documented WinDbg commands

Pure UI shortcut topics remain available as documentation, but they are not exposed as executable MCP tools.

Development

cargo check
cargo test

Notes

• This project was written entirely with a Vibe Coding workflow
• The server runs inside the WinDbg process
• The runtime does not parse docs/debugger.chm; it uses the prebuilt static catalog in src/command_catalog.json
• The transport is Streamable HTTP
• Set your MCP client timeout as high as possible, because some WinDbg operations can take a long time to finish