x2mcp 0.1.0-beta.1

x2mcp

⚠️ Beta release

x2mcp is in beta (0.1.0-beta). It's had a manual QA pass across all five supported languages— expect rough edges, and expect breaking changes before a 1.0 release. Please open an issue if something breaks.

Create a native-language MCP server wrapper around any language

x2mcp scans an existing source file or project, discovers its public functions/methods, and generates a self-contained, stateless Model Context Protocol (MCP) server that exposes them as MCP tools — without touching or forking your original code. It emits a small wrapper project next to your source, wires up the target language's native MCP SDK, and builds it into a runnable server binary using that language's own toolchain.

How it works

1. Detect — the source path's file extensions are matched against a language module (C#, Python, Go, Rust, Ruby).
2. Scan — the module's scanner walks the source and produces a surface of public types and functions (for C#, this is a Roslyn syntax-tree walk).
3. Emit — the module's wrapper emitter generates a companion project: an entry point that starts an MCP server plus one tool class per scanned type, each method delegating straight to your original code.
4. Build — x2mcp shells out to the language's own toolchain (e.g. dotnet publish, go build, cargo build, pyinstaller) to produce a runnable server at the requested output path.

Supported languages

Installation

x2mcp is published as a .NET global tool.

Prerequisite: .NET 10 SDK or later.

While x2mcp is in beta, no stable version exists yet — dotnet tool install/update only consider stable versions by default, so the plain form of these commands will fail with "package not found" until 1.0 ships. Pass --prerelease (or pin an exact --version) until then:

dotnet tool install --global --prerelease x2mcp

Upgrade to the latest version at any time with:

dotnet tool update --global --prerelease x2mcp

CLI syntax

x2mcp <source> [--out-dir <path>] [--transport <stdio|http>] [--name <name>]

Example

x2mcp ./Calculator --out-dir ./dist/calculator-mcp --name calculator --transport stdio

Scanning ./Calculator...
Detected language: C#
Creating stdio server...
Done. MCP server written to: ./dist/calculator-mcp