Runno Code Sandbox
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 execution is provided over STDIO.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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taybenlor
Source: mcp.so
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
run_codeRun code in a sandboxed environment. Specify a runtime and then provide some code to run. | runtime | Programming Language | |---------|----------------------| | python | Python | | quickjs | JavaScript | | clang | C | | clangpp | C++ …
run_code_with_filesRun code in a sandboxed environment against some files, then get the resulting files. Specify a runtime, some code to run, some files for the code to operate on, and the names of the files you want to output. | runtime | Programming Language | |---------|----------------------| | python | Python …
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
All four hints declared on every tool
2/2 tools missing one or more hints — run_code (missing: destructiveHint, openWorldHint); run_code_with_files (missing: destructiveHint, openWorldHint). OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.11.4 (high), @modelcontextprotocol/sdk@1.11.4 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
Domain consistency
npm scope @runno doesn't match GitHub owner taybenlor
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
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