Deno Sandbox MCP Server

MCPOpen Source33.6

by bewt85 • Security & Privacy

A local MCP server that runs TypeScript, JavaScript, and Python code inside a Deno sandbox with explicit permission controls for safe execution.

Example Use Cases

1
Execute and test TypeScript or JavaScript code locally with fine-grained Deno permission controls (network, read, write, deny paths).
2
Run Python code within the same sandboxed environment using Pyodide while limiting filesystem and network access.
3
A simple, auditable local MCP endpoint (e.g., for Claude Desktop) to allow LLMs to run code safely against specific directories or trusted hosts.

Description

This MCP provides a controlled environment to execute TypeScript/JavaScript via Deno and Python via Pyodide, passing Deno runtime permissions through to limit network and filesystem access. It is designed to let LLMs run and test code locally while reducing risk from prompt injection by restricting what the executed code can access. The codebase emphasizes simplicity and auditability and can be used with MCP clients like Claude Desktop.

Capabilities(3 total)

Tools (2)

runTypescript

Executes TypeScript/JavaScript code in a Deno sandbox. Returns stdout; use console.log(...) to print results. Current Deno Permissions: --allow-net=icanhazip.com,example.com

code:string*

runPython

Executes Python using Pyodide in a Deno sandbox. Imports many commont packages automatically (e.g. numpy). Returns stdout; use print(...) to print results. Current Deno Permissions: --allow-net=icanhazip.com,example.com There is an issue with file writing. You need to run 'import js; js.fs.writeFileSync(PATH, CONTENT)'. Other network and filesystem access works fine if you have permission

code:string*

Resources (1)

deno-permissions

URI: permissions://deno

Quick Actions

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Security

Scanned 3 month(s) ago

Risk Level

CRITICAL

Shell/code execution or full filesystem access

Trust Score

D43/100

4/17 checks passed

Scores are informational only and provided “as is” without warranty. AgentHotspot assumes no liability for actions taken based on these ratings.

Quick Stats

Service TypeMCP

Pricing ModelFree

Capabilities2 Tools / 0 Prompts / 1 Resources

Ownerbewt85

CategorySecurity & Privacy

DependenciesStandalone

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