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MCP server · AI

Debug MCP

· github.com/jkolo/debug-mcp

MCP server for Ruby runtime debugging — connects LLM agents to live Ruby/Rails processes via the debug gem.

Unclaimed debug-gemdebuggerllmmcprdbgrubyruby-on-rails
InstallView source
34Low

Scored 6 days ago · breakdown

About Debug MCP

Debug MCP is an MCP server in the AI category: mCP server for Ruby runtime debugging — connects LLM agents to live Ruby/Rails processes via the debug gem.

The repository has 4 stars and 0 forks.

Install

From source
git clone https://github.com/jkolo/debug-mcp

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

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README

debug-mcp.net

CI NuGet .NET MCP License

MCP server for .NET debugging — enable AI agents to debug .NET applications interactively.

What is debug-mcp?

debug-mcp is a Model Context Protocol server that exposes .NET debugging capabilities as structured API tools. It allows AI assistants like Claude, GPT, or Copilot to:

  • 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 interfaces directly with the .NET runtime using ICorDebug APIs — the same approach used by JetBrains Rider.

Quick Start

Run

# No installation needed (.NET 10+)
dnx -y debug-mcp

Requirements

  • .NET 10 SDK or later
  • Linux (Windows and macOS support planned)

Configure with Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "dotnet-debugger": {
      "command": "dnx",
      "args": ["-y", "debug-mcp"]
    }
  }
}

Configure with Claude Code

Add to your .mcp.json:

{
  "mcpServers": {
    "dotnet-debugger": {
      "command": "dnx",
      "args": ["-y", "debug-mcp"]
    }
  }
}

Example Conversation

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

Tools (34)

Category Tools Description
Session debug_launch, debug_attach, debug_disconnect, debug_state Start, stop, and monitor debug sessions
Execution debug_continue, debug_pause, debug_step Control program flow
Breakpoints breakpoint_set, breakpoint_remove, breakpoint_list, breakpoint_enable, breakpoint_wait Set and manage source breakpoints
Exception Breakpoints breakpoint_set_exception Break on specific exception types (first/second chance)
Tracepoints tracepoint_set Non-blocking breakpoints that log messages without pausing
Exception Autopsy exception_get_context Full exception analysis: type, message, inner exceptions, stack frames with source, and local variables
Inspection threads_list, stacktrace_get, variables_get, evaluate Examine program state
Memory object_inspect, memory_read, layout_get, references_get, members_get Deep object and memory analysis
Modules modules_list, modules_search, types_get Explore loaded assemblies and types
Code Analysis code_load, code_goto_definition, code_find_usages, code_find_assignments, code_get_diagnostics Roslyn-powered code navigation and diagnostics
Process I/O process_write_input, process_read_output Interact with debuggee stdin/stdout

Resources (4)

URI Description
debugger://session Current debug session state
debugger://breakpoints All active breakpoints
debugger://threads Thread list with states
debugger://source/{file} Source file contents

Documentation

Similar Projects

Project Language Approach .NET Support
mcp-debugger TypeScript DAP Via external debugger
dap-mcp Python DAP Via external debugger
LLDB MCP C++ Native No
debug-mcp C# ICorDebug Native, direct

License

AGPL-3.0 — see LICENSE for details.

README copy captured when this server was indexed; it may lag the repository. The original is authoritative.

Questions

About Debug MCP

How do I install Debug MCP?

No package has been published for this server, so install it from source: clone the repository and follow its README.

Is Debug MCP safe to use with an AI agent?

Its trust score is 34 out of 100 (low). It passes 1 of the 1 static security checks run so far. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Debug MCP still maintained?

Conduid hasn't recorded a commit date for this repository yet. Check the repository directly for recent activity.