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lisa.py

LLDB extension that adds an MCP bridge to a debugging session, adapted from ida-pro-mcp: the plugin's mcp start command serves 18 debugger functions over local JSON-RPC, and a FastMCP stdio server generated from those functions exposes them to MCP clients such as Claude Desktop. The tools create, launch or attach to targets, step, manage breakpoints, read backtraces, variables, disassembly and memory, evaluate expressions and run arbitrary LLDB commands. The same script keeps lisa.py's earlier exploit-development helpers, including checksec, a register and stack context view, Mach-O header and load-command display, Capstone disassembly and an exploitable crash-triage command.

Requirements & limits

  • The default dev branch was reviewed at commit 9dd61e9 from 2025-03-29, the last of three commits that day adding the MCP integration to a 2021 rewrite of lisa.py. There are no releases or tags, the master branch still holds the 2017 version without MCP support, and the README's TODO list asks for updated manuals and more test cases.
  • Python 3.10+ and LLDB with Python bindings; the LLDB Python environment must also import capstone, pinned to 4.0.2 in requirements.txt, and the MCP server needs fastmcp and httpx. The README is partly out of step with the code: it names server.py, lldb_plugin.py and an lldb-mcp clone path, while the repository ships lisa.py and lldb_mcp.py, and the pyproject lldb-mcp entry point names a module that does not exist.
  • Load lisa.py into LLDB with command script import, run mcp start, and point the MCP client at lldb_mcp.py; the README shows a Claude Desktop configuration that runs it through uv. The plugin listens on localhost port 13338 without authentication, and the MCP server always connects to that port even if mcp start was given another. run_lldb_command passes any LLDB command through, so a connected client has full control of the debugger and the debugged process.
  • The helper commands parse Mach-O headers and load commands and handle x86_64 and arm64/arm64e registers; the README states no supported operating system or LLDB version. The tests directory holds small crash programs, including Objective-C and libdispatch cases, that make rtests runs through LLDB; no CI is configured.
  • LICENSE is Apache-2.0, but pyproject.toml declares MIT and lldb_mcp.py carries ida-pro-mcp's MIT notice. The reviewed sources establish no REA connection. Nothing was installed or run.

About this entry

Type
Integration
Category
Independent MCP integrations
Relationship
Independent agent integration
Targets
Binary

Sources reviewed

The description was reviewed against primary sources. This does not establish runtime testing, security auditing or verified compatibility.

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Primary sources

  1. README.md GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  2. lldb_mcp.py GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  3. lisa.py#L5380-L6322 GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  4. lisa.py#L6408-L6534 GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  5. pyproject.toml GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  6. requirements.txt GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  7. Makefile GitHub · ant4g0nist/lisa.py · Revision 9dd61e9
  8. LICENSE GitHub · ant4g0nist/lisa.py · Revision 9dd61e9

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