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mcp-wallfacer

v0.8.1

Published

Runtime fuzzing and invariant-testing harness for MCP servers — catch crashes, hangs, schema drift, and state leaks before they ship.

Downloads

777

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

lacausecryptolacausecrypto

Keywords

mcpmodel-context-protocolfuzzingtestingvalidationsecurity

Readme

mcp-wallfacer (npm wrapper)

Thin npm wrapper around the mcp-wallfacer Rust binary. Installs the matching platform binary from the GitHub release at postinstall time and exposes it as wallfacer.

npm install -g mcp-wallfacer
wallfacer --help

What it installs

| Platform | Architecture | Triple | |---|---|---| | Linux | x86_64 | x86_64-unknown-linux-gnu | | Linux | aarch64 | aarch64-unknown-linux-gnu | | macOS | Intel | x86_64-apple-darwin | | macOS | Apple silicon | aarch64-apple-darwin | | Windows | x86_64 | x86_64-pc-windows-msvc |

For other platforms, build from source:

cargo install mcp-wallfacer

Environment variables

| Var | Default | Purpose | |---|---|---| | WALLFACER_VERSION | v<package.json#version> | Pin the GH release to download. | | WALLFACER_SKIP_INSTALL | unset | When 1, the postinstall script is a no-op. Useful in container builds that vendor the binary themselves. |

How the wrapper works

  1. postinstall (scripts/install.js) runs once per npm install.
  2. It maps process.platform × process.arch to a Rust target triple, downloads the matching GitHub release tarball, and extracts the wallfacer binary into node_modules/mcp-wallfacer/bin/.
  3. bin/wallfacer.js (the package's only bin entry) is a tiny shim that forwards argv + stdio to the binary and exits with its exit code.

The wrapper does not execute any Rust at runtime; it just runs the prebuilt binary verbatim, so behaviour is identical to a direct cargo install of the same version.