ASP.NET Core Debugger MCP server

This is a helper that lets your AI actually debug a .NET or ASP.NET Core app for you. Instead of guessing where the bug is, the AI can pause your running code, look at the real values, and tell you what it found. It is handy for developers who work on .NET apps and want faster answers about crashes, hangs, or wrong results.

What this MCP server does

You describe the problem to your AI, like an endpoint returning the wrong data or a request that hangs. The AI uses this helper to start or attach to your .NET app. The helper talks to a debugger called netcoredbg, which pauses the app at the right spot. The AI then reads the actual values, threads, and call stack, and tells you what it saw. It can also change a value in memory to test a fix without you editing code.

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What you can do with it

• Pause your app at a specific line and read the real variable values
• Step through code line by line to see how execution flows
• Find out why a request hangs by analyzing what each thread is waiting on
• Trace a slow request and show where the time is spent
• Inspect an exception with its full chain, top frames, and local values
• Change a value in memory to test a fix without restarting
• Attach to a running app instead of starting a new one

Try asking your AI

• “Why does GET /users/active return an empty list?”
• “My /admin/users endpoint returns 401 for Anna. What does the auth handler actually see?”
• “The /reports endpoint hangs forever in staging. Attach and tell me what is blocking.”
• “GET /order/42 takes 800ms. Show me where the time is going.”

What it gives back to you

You get answers in the chat, grounded in what the debugger actually saw. That can be variable values, a call stack, a list of threads and what they are waiting on, a timeline of a slow request, or a summary of an exception. If the AI changed a value in memory, it tells you what it set and what happened next.

Before you start

Who it's for

Developers and engineers who work on .NET or ASP.NET Core apps and want faster, evidence-based answers about bugs.