Lldb MCP Server

What is Lldb_mcp?

Lldb_mcp is a simple MCP server for the LLDB debugger with minimal dependencies. It provides two commands (lldb_init and lldb) and works well with o4-mini and Gemini 2.5 Pro. Output is captured automatically, so no copy-paste is needed.

How to use Lldb_mcp?

Clone the repository, create a Python virtual environment, install fastmcp, then configure your MCP client with the path to the virtual environment’s Python and the lldb_mcp.py script. Additionally, import lldb_server.py into a running LLDB session. The server must be started manually inside an LLDB session.

Key features of Lldb_mcp

• Minimal dependencies (less than 200 lines of code)
• Only two commands: lldb_init and lldb
• Automatic output capture – no manual copy-paste
• Synchronous LLDB operation avoids complex event listeners
• Command chaining is disallowed for safety
• Returns “Executed successfully” when a command produces no output

Use cases of Lldb_mcp

• Debugging programs using LLMs that can issue LLDB commands
• Automating LLDB interactions via MCP protocol without manual terminal work
• Using o4-mini or Gemini 2.5 Pro to control LLDB debugging sessions
• Safe, manually‑started LLDB command execution with a blacklist of dangerous commands