debug-mcp
About
MCP server exposing .NET debugging as 34 AI-accessible tools via ICorDebug APIs — breakpoints, stepping, inspection, exception autopsy, and code analysis.
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- Author
- jkolo
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- Developer Tools
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Setup
Install debug-mcp in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/jkolo/debug-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
MCP server for .NET debugging— enable AI agents to debug .NET applications interactively.
- Launch or attach to .NET processes
- Set breakpoints, exception breakpoints, and tracepoints
- Step through code line by line
- Inspect variables, evaluate expressions, and read memory
- Analyze stack traces and threads
- Get full exception context with one call (exception autopsy)
- Navigate code with go-to-definition, find usages, and diagnostics
- Automatically resolve symbols from public symbol servers
Unlike similar tools that use external debuggers via DAP protocol, debug-mcp interfacesdirectly with the .NET runtimeusing ICorDebug APIs — the same approach used by JetBrains Rider.
# No installation needed (.NET 10+) dnx -y debug-mcp
- .NET 10 SDK or later
- Linux (Windows and macOS support planned)
Add to yourclaude_desktop_config.json:
{ "mcpServers": { "dotnet-debugger": { "command": "dnx", "args": ["-y", "debug-mcp"] } } }
{ "mcpServers": { "dotnet-debugger": { "command": "dnx", "args": ["-y", "debug-mcp"] } } }
You: Debug my ASP.NET app and find why GetUser returns null Claude: I'll launch your application and investigate. [Calls debug_launch with program path] [Calls breakpoint_set at UserService.cs:42] [Calls debug_continue] [Calls breakpoint_wait with 30s timeout] The breakpoint was hit. Let me check the variables. [Calls variables_get for current frame] I found the issue: the userId parameter is an empty string. The bug is in the calling code at line 28 where...
You: My app throws NullReferenceException somewhere in checkout. Find it. Claude: I'll set an exception breakpoint and trigger the flow. [Calls debug_launch with program path] [Calls breakpoint_set_exception for System.NullReferenceException] [Calls debug_continue] [Calls breakpoint_wait with include_autopsy: true] Caught it! The exception was thrown in OrderService.cs at line 87. Here's the full context from the autopsy: - cart.Items was null because LoadCart() returned an empty cart - The null check at line 85 only checked cart, not cart.Items
- Architecture— System design and components
- How Debugging Works— ICorDebug internals explained
- MCP Tools Reference— Complete API documentation
- MCP Resources— Subscribable state views
- Development Guide— Building, testing, contributing
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