@taybenlor
Basic information
The @runno/mcp server provides a run_code tool that AI assistants can use to execute code snippets in various programming languages. It leverages the @runno/sandbox package, which uses WebAssembly to create isolated environments for code execution. The result of the code executio
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"runno": {
"command": "/usr/local/bin/npx",
"args": [
"@runno/mcp"
]
}
}
}Tool list not available yet
This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.
We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.
Runno Code Sandbox helps you make runnable code examples that can be embedded in web pages. It uses a WASI (Web Assembly System Interface) runtime to emulate a file system and operating system inside the browser, allowing programs to run without modification. It is primarily designed for programming education, enabling learners to run code without installing complex tools and creators to embed interactive examples without a server.
Install the @runno/runtime npm package, import it in your entrypoint file, and set the HTTP headers Cross-Origin-Opener-Policy: same-origin and Cross-Origin-Embedder-Policy: require-corp to create a cross-origin isolated context. Then use the <runno-run> element with a supported runtime (e.g., runtime="python") and your code as its content. For running WASI binaries directly, use <runno-wasi>.
@runno/runtime) and a headless WASI runtime (@runno/wasi).Runno fetches the WebAssembly binary for the chosen language from WAPM (Web Assembly Package Manager), then runs it in a Web Worker inside a sandbox with an in-memory file system. STDIN/STDOUT are connected to a terminal emulator.
Supported runtimes include Python, Ruby, QuickJS (JavaScript), SQLite, Clang (C), Clang++ (C++), and PHP-CGI. Availability depends on what has been compiled to WASI and uploaded to WAPM.
Two sandboxing layers are used: the WebAssembly layer controls system resource access, and embedding within a cross-origin iframe isolates the code from the hosting page’s cookies and API calls. However, resource hogging (e.g., infinite loops) remains possible.
Not all programming languages are available; only those compiled to WASI. There is no full Linux environment, so system-level interfaces often won’t work. Importing packages or modules is difficult; code must be provided inline. It is best suited for small examples using STDIN/STDOUT.
You must set `Cross-Origin-Opener-Policy: same-origin` and `Cross-Origin-Embedder-Policy: require-corp` to enable `SharedArrayBuffer`, which is needed for STDIN support.
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