ctxdebug — MCP servers for WinDbg, IDA Pro, and x64dbg

MCP servers for WinDbg, IDA Pro, and x64dbg
One stdio interface · 160+ tools · Three debuggers, one client.

Quick Start · Architecture · Servers · Workflows · Report an Issue

Website · ctxdebug.xyz · Contact · [email protected] · Status · Public alpha

_{For authorized reverse engineering, crash analysis, and security research on systems you own or have permission to analyze.}

▎ Overview

ctxdebug is an MCP (Model Context Protocol) platform that connects WinDbg, IDA Pro 9.x, and x64dbg to AI coding assistants. Use it for crash dump analysis, static review in IDA, and live debugging in x64dbg — without copying output between windows.

One stdio interface. 160+ tools. Three debuggers, one client.

How it works. Each debugger is exposed as an MCP tool server. You talk to Claude, Kiro, or any MCP-compatible client; the client calls the debuggers. No copy-paste, no manual correlation between tools.

Example. You ask: "analyze this crash dump and find the root cause." ctxdebug opens the dump in WinDbg, runs !analyze -v, takes the faulting address, decompiles the function in IDA Pro, and returns a combined report with pseudocode and the caller chain.

▎ Demo

ctxdebug demo — crash dump analysis with WinDbg and IDA in one request

_{One prompt → WinDbg opens the dump, analyzes the crash, IDA decompiles the faulting function — combined report in ~1.8s.}

▎ Quick Start

Requirements

Python 3.11+
OS Windows 10 / 11
At least one debugger — WinDbg (Windows SDK) · IDA Pro 9.x · x64dbg

Install

git clone https://github.com/DdUdle/ctxdebug.git
cd ctxdebug
pip install -e .

Register servers

Individual servers:

claude mcp add windbg       -- python windbg_mcp.py
claude mcp add ida          -- python ida_mcp.py
claude mcp add x64dbg       -- python -m agent --mcp
claude mcp add mco          -- python mco_orchestrator.py
claude mcp add mco-sessions -- python mco_sessions.py

Or use the unified gateway — one server, every tool:

claude mcp add mco-gateway -- python mco_gateway.py

See mcp_config_example.json for full JSON configuration with environment variables.

Try it

Once a server is registered, ask your AI client:

Open C:\dumps\crash.dmp, run a full crash analysis,
and decompile the function at the fault address.

The orchestrator chains windbg_open_dump → windbg_analyze_crash → mco_pivot_to_ida and returns pseudocode with the caller chain.

▎ Features

Capability	What it does
Live debugger control	Run, pause, step, and inspect a process through x64dbg. Set breakpoints on API groups (`memory`, `network`, `crypto`) instead of one address at a time.
Cross-debugger pivot	Take an address from a WinDbg crash dump and open it in IDA Pro for decompilation, callers, and callees in one tool call.
Goal-driven analysis	The x64dbg server includes an optional ReAct agent (`agent_analyze`) that plans multi-step goals — for example finding an unpacking loop or listing anti-analysis checks — by chaining tool calls. Works with Claude, Groq, local Ollama, or heuristics only.
Persistent notes	The agent stores packer signatures, anti-analysis patterns, and notes from earlier sessions, and can recall them on new targets.
Session recording	Tool calls can be logged to SQLite with full-text search (FTS5). Replay a timeline, compare two sessions, or export a Markdown report.
Anti-analysis survey	Combines a static scan (IDA imports/patterns) and a dynamic scan (x64dbg PEB/RDTSC) into one report. Optional lab patches (PEB flags, instruction edits) for samples you are authorized to analyze.

▎ Architecture

System architecture — one MCP connection to three debuggers, an orchestrator, and a session layer

Transport — stdio JSON-RPC (MCP 2024-11-05)
IDA — HTTP REST on localhost:2022, auto-discovers the endpoint from 6 candidates
x64dbg — binary framing over a named pipe (X64A magic + uint32 length + 8-byte padding + JSON)
Agent — ReAct loop with pluggable LLM backends (Claude, Groq, OpenRouter, local Ollama, or heuristics only)
Sessions — SQLite with FTS5, WAL mode, thread-safe
Gateway — starts sub-servers as child processes and proxies tool calls through one stdio connection

▎ Servers

Server	File	What it does	Tools
`windbg`	`windbg_mcp.py`	Crash dumps, heap analysis, shadow stack, kernel debugging	70+
`ida`	`ida_mcp.py`	Decompilation, xrefs, type recovery, binary patching	32+
`x64dbg`	`agent/`	Dynamic analysis, ReAct agent, memory inspection and patching	38+
`mco`	`mco_orchestrator.py`	Cross-debugger compound workflows	7
`mco-sessions`	`mco_sessions.py`	Session recording, FTS search, Markdown export	13
`mco-gateway`	`mco_gateway.py`	Unified proxy — all servers through one connection	all

▎ Debugger setup

WinDbg

Needs cdb.exe from the Windows SDK. Default path:

C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\cdb.exe

Set WINDBG_MCP_CDB if your path differs. No pre-launch needed — tools open dumps or attach on demand.

IDA Pro 9.x

Open IDA Pro 9.x with a binary loaded.

In the Python console, run:

exec(open(r'path\to\ctxdebug\ida_server_plugin.py').read())

HTTP server starts on port 2022.

x64dbg

Build the C++ plugin:
```
cd agent\plugins
build_plugin.bat
```
Copy mco_agent.dp64 to x64dbg's plugin directory.
Restart x64dbg — the plugin exposes named pipe \\.\pipe\x64dbg_ai_agent.

▎ Key Workflows

Crash dump → source (one command)

mco_crash_to_source(dump_path="C:\\dumps\\crash.dmp")

Opens the dump, runs !analyze -v, extracts the faulting address, decompiles the crashing function in IDA, and returns pseudocode with callers.

Anti-analysis report

mco_bossix_report()
bossix_hide()            # PEB flag adjustments (lab)
bossix_patch(address)    # NOP / flip JCC at a check (lab)

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