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@debugmcp/mcp-debugger

v0.24.2

Published

Step-through debugging MCP server for LLMs

Vulnerabilities

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Links

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Maintainers

debugmcpdevdebugmcpdev

Keywords

Readme

@debugmcp/mcp-debugger

Step-through debugging MCP server for LLMs across eight languages — 28 tools covering breakpoints (line, statement-anchored, function, logpoints), stepping, stack/variable inspection, expression evaluation, buffered program output, launch/attach/restart lifecycle, and a read-only IDE mirror of the live session.

Installation

You can use this package without installation via npx:

npx @debugmcp/mcp-debugger stdio

Or install it globally:

npm install -g @debugmcp/mcp-debugger

Usage

STDIO mode (default)

mcp-debugger stdio

SSE mode

Deprecated: SSE transport is deprecated and will be removed in a future release. Use mcp-debugger http --port 3001 instead.

mcp-debugger sse --port 3001

HTTP mode (recommended)

mcp-debugger http --port 3001

Batteries-Included Adapters

All language adapters are bundled into the CLI package. No separate installation is needed. The following adapters are included:

  • Python (@debugmcp/adapter-python) - Python debugging via debugpy
  • Ruby (@debugmcp/adapter-ruby) - Ruby debugging via rdbg
  • JavaScript (@debugmcp/adapter-javascript) - JavaScript/Node.js debugging via js-debug
  • Rust (@debugmcp/adapter-rust) - Rust debugging via CodeLLDB
  • Go (@debugmcp/adapter-go) - Go debugging via Delve
  • Java (@debugmcp/adapter-java) - Java debugging via JDI bridge
  • .NET (@debugmcp/adapter-dotnet) - .NET debugging via netcoredbg
  • C/C++ (@debugmcp/adapter-cpp) - C/C++ debugging via CodeLLDB
  • Mock (@debugmcp/adapter-mock) - Mock adapter for testing

System Requirements: Node.js 22+ is required to run mcp-debugger. Launching a program also needs that language's toolchain on the machine:

  • Python: Python 3.7+ with debugpy (pip install debugpy)
  • Ruby: Ruby with the debug gem (rdbg)
  • JavaScript/TypeScript: nothing extra — js-debug is bundled
  • Rust: the Rust toolchain (rustc/cargo; GNU toolchain on Windows). CodeLLDB itself is vendored — no system LLDB needed
  • Go: Go + Delve (go install github.com/go-delve/delve/cmd/dlv@latest)
  • Java: JDK 21+ (compile targets with javac -g)
  • .NET: netcoredbg + a compatible .NET runtime (Portable PDBs)
  • C/C++: none for prebuilt binaries (CodeLLDB vendored); a compiler (g++/clang++) only for lone-source-file launch

CodeLLDB platform note: this npm package bundles CodeLLDB for linux-x64 only — Rust and C/C++ debugging work out of the box on Linux (CI, containers, cloud sandboxes). On Windows/macOS, point CODELLDB_PATH at a CodeLLDB binary for your platform, or use the Docker image.

Attach without a toolchain: direct-connect attach modes (Python debugpy --listen, Ruby rdbg --open, Java JDWP) need no local language toolchain — the debug engine runs inside the target. list_supported_languages reports per-mode availability with reasons.

Useful environment variables

| Variable | Effect | |---|---| | DEBUG_MCP_NO_REDACT=1 | Disable default-on secret redaction in variable/evaluate/output results | | DEBUG_MCP_VARIABLE_ACCESS=explicit | Least-privilege mode: get_variables requires explicit names: [...] | | DEBUG_MCP_BP_ADDRESSING=line\|assert\|content | Breakpoint addressing mode (default content: statement anchors + content assertions) | | CODELLDB_PATH | Path to a CodeLLDB binary for platforms not bundled (see note above) | | CPP_MSVC_BEHAVIOR=warn\|error\|continue | What to do when a C/C++ target looks MSVC-built (partial PDB fidelity) | | MCP_HTTP_STALE_SESSION_MS | HTTP mode: reap crash-abandoned MCP sessions after this idle time (default 30 min) |

Check Rust binary compatibility

mcp-debugger check-rust-binary <path-to-binary>
mcp-debugger check-rust-binary --json <path-to-binary>

Analyzes a Rust executable to determine whether it was built with the GNU or MSVC toolchain and reports CodeLLDB debugging compatibility. Use --json for machine-readable output.

Options

Common options (all commands)

  • --log-level <level> - Set log level (error, warn, info, debug)
  • --log-file <path> - Log to file instead of console

SSE and HTTP options

  • -p, --port <number> - Port for SSE or HTTP mode (default: 3001)

Documentation

See the main repository for full documentation.

License

MIT