x64dbg MCP Server

An MCP server that gives AI assistants full control over the x64dbg debugger. 23 mega-tools covering 151 REST endpoints via Zod discriminated unions - stepping, breakpoints, memory, disassembly, tracing, anti-debug bypasses, control flow analysis, PE dumping, and more.

Works with Claude Code, Claude Desktop, Cursor, Windsurf, Cline, and any MCP-compatible client.

Quick Start

Prerequisites

x64dbg - Download latest snapshot
Node.js >= 18 - Download
MCP plugin - Download from releases (x64dbg_mcp.dp64 and/or x64dbg_mcp.dp32)

Step 1: Install the Plugin

Copy the plugin DLLs into your x64dbg plugins directories:

x64dbg/
  x64/plugins/x64dbg_mcp.dp64    <-- for 64-bit debugging
  x32/plugins/x64dbg_mcp.dp32    <-- for 32-bit debugging

Start x64dbg. You should see in the log:

[MCP] x64dbg MCP Server started on 127.0.0.1:27042

Step 2: Add to Your AI Client

Pick your client and copy the config:

Claude Code

Add to .claude/settings.json (project-level) or ~/.claude/settings.json (global):

{
  "mcpServers": {
    "x64dbg": {
      "type": "stdio",
      "command": "cmd",
      "args": ["/c", "npx", "-y", "x64dbg-mcp-server"]
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "x64dbg": {
      "command": "npx",
      "args": ["-y", "x64dbg-mcp-server"]
    }
  }
}

Cursor

Add to .cursor/mcp.json (project-level) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "x64dbg": {
      "command": "npx",
      "args": ["-y", "x64dbg-mcp-server"]
    }
  }
}

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "x64dbg": {
      "command": "npx",
      "args": ["-y", "x64dbg-mcp-server"]
    }
  }
}

Cline (VSCode extension)

Open Cline settings > MCP Servers > Configure, then add to cline_mcp_settings.json:

{
  "mcpServers": {
    "x64dbg": {
      "command": "npx",
      "args": ["-y", "x64dbg-mcp-server"]
    }
  }
}

Any other MCP client

The server uses stdio transport. Spawn it as a child process:

npx -y x64dbg-mcp-server

Communicate over stdin/stdout using the MCP protocol.

Step 3: Start Debugging

Open any executable in x64dbg, then talk to your AI assistant:

"Set a breakpoint on CreateFileW and run the program"
"Disassemble the current function and explain what it does"
"Search for the byte pattern 48 8B ?? 48 85 C0 in the main module"
"Hide the debugger and bypass the anti-debug checks"
"List all threads and show me which one is the anti-cheat scanner"
"Trace into the VM dispatcher and log all instructions to a file"

How It Works

The system has two components:

                         stdio                        HTTP (localhost)
 MCP Client  <───────────────────>  TypeScript MCP  <──────────────────>  C++ Plugin
 (Claude,                           Server            127.0.0.1:27042     (inside x64dbg)
  Cursor,                           23 mega-tools                         151 REST endpoints
  etc.)                             Zod validation                        Bridge/Plugin SDK

C++ Plugin (x64dbg_mcp.dp64 / .dp32) runs inside x64dbg as a lightweight REST API server on 127.0.0.1:27042. It wraps the x64dbg Bridge/Plugin SDK with 151 JSON endpoints across 22 handler files.
TypeScript MCP Server (x64dbg-mcp-server on npm) implements the MCP protocol over stdio. The 23 mega-tools use Zod discriminated unions to validate parameters, then route requests to the correct REST endpoint on the plugin via localhost HTTP.

The MCP server waits up to 2 minutes for the plugin to become available, performs health checks every 15 seconds, and automatically reconnects if x64dbg restarts. Requests retry up to 3 times with exponential backoff.

Why stdio? No SSE reconnection issues, no port conflicts, no dropped connections. The MCP client spawns the server as a child process - it just works.

Tool Reference (23 Mega-Tools)

Each tool accepts an action parameter that selects the specific operation. Parameters are validated with Zod schemas at runtime.

Debugger Control

Tool	Actions	Description
`x64dbg_debug`	`run`, `pause`, `force_pause`, `step_into`, `step_over`, `step_out`, `stop_debug`, `restart_debug`, `run_to_address`, `state`	Control execution flow and query debugger state
`x64dbg_command`	`execute`, `script`, `evaluate`, `format`, `set_init_script`, `get_init_script`, `get_hash`, `get_events`	Execute raw x64dbg commands, batch scripts, and expression evaluation

CPU & Memory

Tool	Actions	Description
`x64dbg_registers`	`get_all`, `get_specific`, `get_flags`, `get_avx512`, `set`	Read/write CPU registers including GPR, flags, and AVX-512
`x64dbg_memory`	`read`, `write`, `info`, `is_valid`, `is_code`, `allocate`, `free`, `protect`, `map`, `update_map`	Full memory operations: read, write, allocate, protect, and memory map
`x64dbg_stack`	`get_call_stack`, `read`, `pointers`, `seh_chain`, `return_address`, `comment`	Call stack unwinding, raw stack reads, SEH chain, return address

Code Analysis

Tool	Actions	Description
`x64dbg_disassembly`	`at_address`, `function`, `info`, `assemble`	Disassemble instructions, whole functions, or assemble new code
`x64dbg_analysis`	`function`, `xrefs_to`, `xrefs_from`, `basic_blocks`, `source`, `mnemonic_brief`	Cross-references, function boundaries, basic blocks, source mapping
`x64dbg_control_flow`	`cfg`, `branch_dest`, `is_jump_taken`, `loops`, `func_type`, `add_function`, `delete_function`	Control flow graph, branch analysis, loop detection, function management
`x64dbg_database`	`constants`, `error_codes`, `structs`, `strings`	Query x64dbg's analysis database for constants, errors, structs, strings
`x64dbg_address_convert`	`va_to_file`, `file_to_va`	Convert between virtual addresses and file offsets
`x64dbg_watchdog`	(id parameter)	Check if a watch expression watchdog has been triggered

Breakpoints & Tracing

Tool	Actions	Description
`x64dbg_breakpoints`	`set_software`, `set_hardware`, `set_memory`, `delete`, `enable`, `disable`, `toggle`, `set_condition`, `set_log`, `reset_hit_count`, `get`, `list`, `configure`, `configure_batch`	Full breakpoint management: software, hardware, memory, conditional, logging, batch
`x64dbg_tracing`	`into`, `over`, `run`, `stop`, `animate`, `conditional_run`, `log_setup`, `hitcount`, `type`, `set_type`	Execution tracing, trace logging, hit counters, conditional tracing
`x64dbg_exceptions`	`set`, `delete`, `list`, `list_codes`, `skip`	Exception breakpoints, known exception codes, skip/pass exceptions

Symbols & Annotations

Tool	Actions	Description
`x64dbg_symbols`	`resolve`, `address`, `search`, `list_module`, `get_label`, `set_label`, `get_comment`, `set_comment`, `bookmark`	Symbol resolution, labels, comments, bookmarks
`x64dbg_search`	`pattern`, `string`, `string_at`, `symbol_auto_complete`, `encode_type`	AOB/byte pattern scan, string search, symbol autocomplete
`x64dbg_modules`	`list`, `get_info`, `get_base`, `get_section`, `get_party`	Loaded modules, base addresses, sections, user/system classification

Process & System

Tool	Actions	Description
`x64dbg_process`	`basic`, `detailed`, `cmdline`, `elevated`, `dbversion`, `set_cmdline`	Process info, PID, PEB, elevation status, debugger version
`x64dbg_threads`	`list`, `current`, `count`, `info`, `teb`, `name`, `switch`, `suspend`, `resume`	Thread enumeration, TEB access, thread control
`x64dbg_handles`	`list_handles`, `list_tcp`, `list_windows`, `list_heaps`, `get_name`, `close`	Handles, TCP connections, windows, heaps
`x64dbg_antidebug`	`peb`, `teb`, `dep`, `hide_debugger`	PEB/TEB inspection, DEP status, hide debugger from anti-debug

Patching & Dumping

Tool	Actions	Description
`x64dbg_patches`	`list`, `apply`, `restore`, `export`	Apply byte patches, restore originals, export patched module
`x64dbg_dumping`	`pe_header`, `sections`, `imports`, `exports`, `entry_point`, `relocations`, `dump_module`, `fix_iat`, `export_patch_file`	PE analysis, module dumping, IAT reconstruction, patch file export

Usage Examples

Basic debugging:

"Set a breakpoint on kernel32.CreateFileW and run"
"Step over 10 instructions and show me the registers"
"What's the current call stack?"

Memory analysis:

"Read 128 bytes at the address pointed to by RDI"
"Search for the byte pattern FF 15 ?? ?? ?? ?? in the .text section"
"Write 90 90 90 (NOPs) at 0x401000 and verify the write"
"Allocate a page of memory and write my shellcode there"

Reverse engineering:

"Disassemble the current function and explain the algorithm"
"Get the control flow graph and identify the switch cases"
"Show me cross-references to this function - who calls it?"
"List all imports from kernel32 and advapi32"
"What loops are in this function? Show me the loop boundaries"

Anti-debug bypass:

"Hide the debugger from anti-debug checks"
"Show me the PEB fields - is BeingDebugged set?"
"Set an exception breakpoint on STATUS_ACCESS_VIOLATION"
"Check DEP status for this process"

Tracing and logging:

"Configure a logging breakpoint on GetProcAddress that logs the function name"
"Set up 8 breakpoints in one call using configure_batch"
"Trace into this function and log every instruction to trace.log"
"Run to user code (skip system DLLs)"

Process inspection:

"List all threads and tell me which one is the main thread"
"Show me all open file handles in this process"
"List TCP connections - is it phoning home?"
"Dump the main module to disk and fix the import table"

Configuration

Environment variables for the MCP server:

Variable	Default	Description
`X64DBG_MCP_HOST`	`127.0.0.1`	Plugin REST API host
`X64DBG_MCP_PORT`	`27042`	Plugin REST API port
`X64DBG_MCP_TIMEOUT`	`30000`	Request timeout in milliseconds
`X64DBG_MCP_RETRIES`	`3`	Retry count on transient failures

Set these in your MCP client config if needed:

{
  "mcpServers": {
    "x64dbg": {
      "command": "npx",
      "args": ["-y", "x64dbg-mcp-server"],
      "env": {
        "X64DBG_MCP_PORT": "27043"
      }
    }
  }
}

Plugin Commands

Control the REST API from the x64dbg command bar:

mcpserver start     Start the HTTP server
mcpserver stop      Stop the HTTP server
mcpserver status    Show server status and port

The plugin also provides GUI dialogs accessible from Plugins > x64dbg MCP Server:

Settings... — configure host, port, and auto-start (persisted via BridgeSetting)
About... — version, live server status (green/red), GitHub link, Discord contact

Architecture

System Overview

┌─────────────────────────────────────────────────────────────────┐
│  MCP Client (Claude Code, Cursor, etc.)                         │
│  Spawns server as child process, communicates via stdin/stdout   │
└──────────────────────────┬──────────────────────────────────────┘
                           │ stdio (MCP JSON-RPC)
┌──────────────────────────▼──────────────────────────────────────┐
│  TypeScript MCP Server (x64dbg-mcp-server)                      │
│                                                                 │
│  23 tools registered via @modelcontextprotocol/sdk              │
│  Zod discriminated unions validate action + parameters          │
│  HttpClient: auto-reconnect, health checks, retry logic         │
└──────────────────────────┬──────────────────────────────────────┘
                           │ HTTP GET/POST (127.0.0.1:27042)
┌──────────────────────────▼──────────────────────────────────────┐
│  C++ Plugin DLL (x64dbg_mcp.dp64 / .dp32)                      │
│                                                                 │
│  Winsock2 HTTP server, JSON via nlohmann/json                   │
│  22 handler files, 151 REST endpoints                           │
│  c_bridge_executor: thread-safe calls to x64dbg SDK             │
└──────────────────────────┬──────────────────────────────────────┘
                           │ x64dbg Bridge/Plugin SDK
┌──────────────────────────▼──────────────────────────────────────┐
│  x64dbg Debugger Engine                                         │
│  DbgFunctions(), Script API, Bridge API                         │
└─────────────────────────────────────────────────────────────────┘

Project Structure

x64dbg_mcp/
├── plugin/                         # C++ x64dbg plugin (REST API server)
│   ├── CMakeLists.txt              # Build config (C++23, clang-cl)
│   ├── CMakePresets.json           # x64-release, x32-release, x64-debug presets
│   ├── plugin.def                  # DLL export definitions
│   ├── sdk/                        # x64dbg Plugin SDK headers + libs
│   │   ├── _plugins.h              # Plugin API
│   │   ├── _dbgfunctions.h         # DbgFunctions() interface
│   │   ├── bridgemain.h            # Bridge API
│   │   ├── jansson/                # JSON library (SDK dependency)
│   │   └── *.lib                   # x64bridge, x32bridge, x64dbg, x32dbg
│   └── src/
│       ├── plugin_main.cpp/.h      # Plugin entry, /api/health, /api/process/info
│       ├── bridge/
│       │   └── c_bridge_executor.* # Thread-safe wrapper for x64dbg API calls
│       ├── handlers/               # 22 REST endpoint handler files
│       │   ├── debug_handler.cpp       # /api/debug/* (11 endpoints)
│       │   ├── register_handler.cpp    # /api/registers/* (5 endpoints)
│       │   ├── memory_handler.cpp      # /api/memory/* (9 endpoints)
│       │   ├── breakpoint_handler.cpp  # /api/breakpoints/* (15 endpoints)
│       │   ├── disasm_handler.cpp      # /api/disasm/* (4 endpoints)
│       │   ├── module_handler.cpp      # /api/modules/* (5 endpoints)
│       │   ├── thread_handler.cpp      # /api/threads/* (9 endpoints)
│       │   ├── stack_handler.cpp       # /api/stack/* (7 endpoints)
│       │   ├── symbol_handler.cpp      # /api/symbols/* (4 endpoints)
│       │   ├── annotation_handler.cpp  # /api/labels/*, /api/comments/*, /api/bookmarks/* (5 endpoints)
│       │   ├── search_handler.cpp      # /api/search/* (5 endpoints)
│       │   ├── command_handler.cpp     # /api/command/* (8 endpoints)
│       │   ├── analysis_handler.cpp    # /api/analysis/* (13 endpoints)
│       │   ├── tracing_handler.cpp     # /api/trace/* (10 endpoints)
│       │   ├── dumping_handler.cpp     # /api/dump/*, /api/patches/export_file (10 endpoints)
│       │   ├── patch_handler.cpp       # /api/patches/* (4 endpoints)
│       │   ├── memmap_handler.cpp      # /api/memmap/* (2 endpoints)
│       │   ├── antidebug_handler.cpp   # /api/antidebug/* (4 endpoints)
│       │   ├── exceptions_handler.cpp  # /api/exceptions/* (5 endpoints)
│       │   ├── process_handler.cpp     # /api/process/* (5 endpoints)
│       │   ├── handles_handler.cpp     # /api/handles/* (6 endpoints)
│       │   └── controlflow_handler.cpp # /api/cfg/* (7 endpoints)
│       ├── http/
│       │   ├── c_http_server.*     # Winsock2 HTTP server (localhost only)
│       │   ├── c_http_router.*     # Method + path routing
│       │   ├── s_http_request.h    # Request struct (method, path, body, query)
│       │   └── s_http_response.h   # Response helpers (ok, bad_request, conflict, etc.)
│       ├── ui/
│       │   ├── settings_dialog.*   # Settings dialog (host, port, auto-start)
│       │   └── about_dialog.*      # About dialog (version, status, links)
│       └── util/
│           └── format_utils.*      # Address formatting, hex parsing
│
├── server/                         # TypeScript MCP server (npm package)
│   ├── package.json                # x64dbg-mcp-server v2.2.1
│   ├── tsconfig.json               # ES2022, Node16, strict mode
│   ├── server.json                 # MCP registry manifest
│   └── src/
│       ├── index.ts                # McpServer entry, stdio transport, graceful shutdown
│       ├── config.ts               # Environment variable config
│       ├── http_client.ts          # HTTP client with auto-reconnect and health monitoring
│       └── tools/                  # 19 tool files, 23 MCP tools
│           ├── index.ts            # Registers all tools on the McpServer
│           ├── debug.ts            # x64dbg_debug
│           ├── registers.ts        # x64dbg_registers
│           ├── memory.ts           # x64dbg_memory (includes memmap)
│           ├── disassembly.ts      # x64dbg_disassembly
│           ├── breakpoints.ts      # x64dbg_breakpoints
│           ├── symbols.ts          # x64dbg_symbols (includes labels, comments, bookmarks)
│           ├── stack.ts            # x64dbg_stack
│           ├── threads.ts          # x64dbg_threads
│           ├── modules.ts          # x64dbg_modules
│           ├── search.ts           # x64dbg_search
│           ├── command.ts          # x64dbg_command
│           ├── analysis.ts         # x64dbg_analysis, x64dbg_database, x64dbg_address_convert, x64dbg_watchdog
│           ├── tracing.ts          # x64dbg_tracing
│           ├── dumping.ts          # x64dbg_dumping
│           ├── antidebug.ts        # x64dbg_antidebug
│           ├── exceptions.ts       # x64dbg_exceptions
│           ├── process.ts          # x64dbg_process
│           ├── handles.ts          # x64dbg_handles
│           ├── controlflow.ts      # x64dbg_control_flow
│           └── patches.ts          # x64dbg_patches
│
├── install.ps1                     # PowerShell deploy script (local use, gitignored paths)
├── LICENSE                         # MIT
└── README.md

Tech Stack

MCP Server (TypeScript)

Runtime: Node.js >= 18
Language: TypeScript (ES2022, strict mode)
MCP SDK: @modelcontextprotocol/sdk ^1.12.1
Validation: zod ^3.25.1
Transport: stdio (stdin/stdout JSON-RPC)

Plugin (C++)

Standard: C++23 (/std:c++latest)
Compiler: Clang-cl (ships with Visual Studio 2022)
Build System: CMake 3.20+ with Ninja
Dependencies: nlohmann/json (via vcpkg), x64dbg Plugin SDK, Winsock2
Package Manager: vcpkg

Building from Source

C++ Plugin

Requires CMake >= 3.20, Ninja, vcpkg, and Clang-cl (ships with Visual Studio 2022 C++ workload).

cd plugin

# Set VCPKG_ROOT to your vcpkg installation
$env:VCPKG_ROOT = "C:\path\to\vcpkg"

# Configure
cmake --preset x64-release    # For 64-bit plugin
cmake --preset x32-release    # For 32-bit plugin

# Build
cmake --build build/x64-release
cmake --build build/x32-release

# Output:
#   build/x64-release/bin/x64dbg_mcp.dp64
#   build/x32-release/bin/x64dbg_mcp.dp32

Copy the .dp64 / .dp32 files to your x64dbg plugins/ directory and restart x64dbg.

TypeScript Server

cd server
npm install
npm run build

To run the server from source instead of npm:

node server/dist/index.js

Or point your MCP client config to the local build:

{
  "mcpServers": {
    "x64dbg": {
      "command": "node",
      "args": ["C:/path/to/x64dbg_mcp/server/dist/index.js"]
    }
  }
}

Troubleshooting

"Connection refused" or server can't reach plugin

Make sure x64dbg is running with a target loaded
Verify the plugin is in the correct plugins/ directory
Check the x64dbg log for [MCP] x64dbg MCP Server started on 127.0.0.1:27042
Test manually: curl http://127.0.0.1:27042/api/health

"Waiting for x64dbg plugin..." hangs

The MCP server waits up to 2 minutes for the plugin to come online. Either:

Start x64dbg before launching your MCP client
Or restart the MCP client after x64dbg is running

Tools return errors about debugger state

Error	Meaning	Solution
"Debugger must be paused"	Inspection tools need paused state	Pause the target or hit a breakpoint first
"No active debug session"	No executable loaded	Load a target in x64dbg (`File > Open`)
"Debugger must be running"	`pause`/`force_pause` need running target	Run the target first

32-bit vs 64-bit

Use the correct plugin for your target architecture:

Target	Debugger	Plugin File
64-bit	x64dbg	`x64dbg_mcp.dp64`
32-bit	x32dbg	`x64dbg_mcp.dp32`

Both use the same MCP server - just npx -y x64dbg-mcp-server.

Plugin not loading

If the plugin doesn't appear in the x64dbg log on startup:

Check that the DLL is in the right directory (e.g., x64/plugins/ for 64-bit)
Make sure you're using a recent x64dbg snapshot (2024+)
Check if another plugin is conflicting on port 27042
Try manually: type mcpserver start in the x64dbg command bar

Request timeouts

For operations on large binaries (full memory scan, module dump), increase the timeout:

X64DBG_MCP_TIMEOUT=120000 npx -y x64dbg-mcp-server

Security

The C++ plugin binds to 127.0.0.1 only - no remote access, no network exposure
The MCP server communicates exclusively via stdio (stdin/stdout)
All HTTP traffic stays on localhost - no data leaves your machine
No authentication is needed because the REST API is localhost-only

Author

bromo - GitHub

Built with Claude Code by Anthropic.

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 23 Commits
build		build
plugin		plugin
server		server
.gitignore		.gitignore
LICENSE		LICENSE
PROMOTION.md		PROMOTION.md
README.md		README.md
install.ps1		install.ps1

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Latest commit

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x64dbg MCP Server

Table of Contents

Quick Start

Prerequisites

Step 1: Install the Plugin

Step 2: Add to Your AI Client

Step 3: Start Debugging

How It Works

Tool Reference (23 Mega-Tools)

Debugger Control

CPU & Memory

Code Analysis

Breakpoints & Tracing

Symbols & Annotations

Process & System

Patching & Dumping

Usage Examples

Configuration

Plugin Commands

Architecture

System Overview

Project Structure

Tech Stack

Building from Source

C++ Plugin

TypeScript Server

Troubleshooting

"Connection refused" or server can't reach plugin

"Waiting for x64dbg plugin..." hangs

Tools return errors about debugger state

32-bit vs 64-bit

Plugin not loading

Request timeouts

Security

Author

License

About

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