Delve MCP server

Delve MCP is a TypeScript-based server that provides a complete interface to the Delve debugger for Go programs. It implements all major Delve commands and capabilities through the Model Context Protocol (MCP), allowing you to debug, trace, and analyze Go applications with a unified interface.

Features

Resources

• List and access debug sessions via delve:// URIs
• Each session has metadata about its type, target, and port
• JSON representation for session details and state

Tools

• Debug commands (debug, attach, exec, test)
• Core dump analysis
• Program tracing
• Replay debugging with rr
• DAP server support
• Breakpoint management with conditions
• Execution control (continue, step, next)
• Variable inspection and evaluation
• Backend selection (native, lldb, rr)
• Logging configuration
• Session management

Prerequisites

Before installing the Delve MCP server, ensure you have:

• Go installed with Delve (go install github.com/go-delve/delve/cmd/dlv@latest)
• For replay functionality: Mozilla rr (https://github.com/mozilla/rr)
• Node.js and npm

Installation

To install Delve MCP server:

npm install @dwisiswant0/delve-mcp

Configuration

To use with Claude Desktop, add the server configuration to the appropriate location:

• On Linux: ~/.config/Claude/claude_desktop_config.json
• On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• On Windows: %APPDATA%/Claude/claude_desktop_config.json

Add the following to your configuration file:

{
  "mcpServers": {
    "delve-mcp": {
      "command": "/path/to/delve-mcp/build/index.js"
    }
  }
}

Available Tools

Debug Commands

• debug - Debug a Go package in current directory or specified package
• attach - Attach to a running process by PID
• exec - Execute and debug a precompiled binary
• test - Debug tests in current package or specified package
• core - Examine a core dump file with associated executable
• dap - Start a Debug Adapter Protocol (DAP) server
• replay - Replay an rr trace recording
• trace - Trace program execution with function matching

Control Commands

• setBreakpoint - Set a breakpoint with optional condition
• removeBreakpoint - Remove an existing breakpoint
• continue - Continue program execution
• next - Step over to next line
• step - Step into function call
• stepout - Step out of current function
• variables - List local variables in current scope
• evaluate - Evaluate expression in current scope

Configuration Commands

• version - Get Delve version information
• setBackend - Configure debug backend (native, lldb, rr)
• configureLogging - Configure debug logging components

Usage Examples

Starting a Debug Session

// Debug current package
{ "name": "debug" }

// Debug with specific package and build flags
{
  "name": "debug",
  "arguments": {
    "package": "./cmd/myapp",
    "buildFlags": "-tags=integration"
  }
}

Managing Breakpoints

// Set a breakpoint
{
  "name": "setBreakpoint",
  "arguments": {
    "sessionId": "abc123",
    "file": "main.go",
    "line": 42,
    "condition": "count > 5"
  }
}

Inspecting State

// List variables
{
  "name": "variables",
  "arguments": {
    "sessionId": "abc123"
  }
}

// Evaluate expression
{
  "name": "evaluate",
  "arguments": {
    "sessionId": "abc123",
    "expr": "myVar.Field"
  }
}

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "delve-mcp" '{"command":"node","args":["/path/to/delve-mcp/build/index.js"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "delve-mcp": {
            "command": "node",
            "args": [
                "/path/to/delve-mcp/build/index.js"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "delve-mcp": {
            "command": "node",
            "args": [
                "/path/to/delve-mcp/build/index.js"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect