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LLM Sandbox MCP

LLM Sandbox is a lightweight, portable Python library that securely executes LLM-generated code in isolated containers or local sandboxes. It supports multiple backends including Docker, Kubernetes, Podman, Bubblewrap, and NsJail, and provides a Model Context Protocol (MCP) server for AI assistants like Claude Desktop to run code safely with customizable security policies and resource limits.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

LLM Sandbox MCP logo, by vndeeCommunity listingLocal stdioSource reviewed; not executedPublished by vndee
Vendor documentation

What you can do with it

  • Execute untrusted LLM-generated code in isolated containers
  • Run Python, JavaScript, Java, C++, Go, and R code safely
  • Integrate with LangChain, LangGraph, and LlamaIndex
  • Allow AI assistants to execute code via MCP protocol

Source and maintenance

Community listingRegistry 0.3.43
mcp-registry: io.github.vndee/llm-sandbox@0.3.43Source repositoryProject website
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

llm-sandbox 0.3.43

pypiuvx
llm-sandbox package definition
{
  "version": "0.3.43",
  "transport": "stdio",
  "identifier": "llm-sandbox",
  "runtimeHint": "uvx",
  "registryType": "pypi",
  "registryBaseUrl": "https://pypi.org",
  "runtimeArguments": [
    {
      "name": "--from",
      "type": "named",
      "value": "llm-sandbox[mcp-docker]",
      "isRequired": true,
      "description": "Install the MCP server extra. The base llm-sandbox package intentionally ships no container or MCP dependencies, so the extra is required for the server to start."
    }
  ],
  "environmentVariables": [
    {
      "name": "BACKEND",
      "choices": [
        "docker",
        "podman",
        "kubernetes"
      ],
      "default": "docker",
      "description": "Container backend to use. Must match the installed extra: mcp-docker, mcp-podman, or mcp-k8s."
    },
    {
      "name": "DOCKER_HOST",
      "description": "Docker or Podman socket URL, e.g. unix:///var/run/docker.sock"
    },
    {
      "name": "KUBECONFIG",
      "description": "Path to kubeconfig file when BACKEND=kubernetes."
    },
    {
      "name": "NAMESPACE",
      "default": "default",
      "description": "Kubernetes namespace used for sandbox pods when BACKEND=kubernetes."
    },
    {
      "name": "COMMIT_CONTAINER",
      "default": "true",
      "description": "Commit the container after a run so installed libraries persist between sessions."
    },
    {
      "name": "KEEP_TEMPLATE",
      "default": "true",
      "description": "Keep the base image after the session ends to avoid re-pulling it on the next run."
    },
    {
      "name": "SANDBOX_NETWORK_MODE",
      "description": "Network mode for the sandbox container. Set to 'none' for hardened isolation. Docker and Podman backends only."
    },
    {
      "name": "SANDBOX_READ_ONLY",
      "description": "Mount the sandbox root filesystem read-only. Recommended: true. Docker and Podman backends only."
    },
    {
      "name": "SANDBOX_CAP_DROP",
      "description": "Comma-separated Linux capabilities to drop. Recommended: ALL. Docker and Podman backends only."
    },
    {
      "name": "SANDBOX_SECURITY_OPT",
      "description": "Comma-separated container security options, e.g. no-new-privileges. Docker and Podman backends only."
    },
    {
      "name": "SANDBOX_MEMORY",
      "description": "Memory limit for the sandbox container, e.g. 4g. Docker and Podman backends only."
    },
    {
      "name": "SANDBOX_CPUS",
      "description": "Fractional CPU allocation for the sandbox container, e.g. 1.5. Docker and Podman backends only."
    }
  ]
}

Tools

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No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "llm-sandbox-mcp": {
      "command": "uvx",
      "args": [
        "llm-sandbox==0.3.43"
      ],
      "env": {
        "BACKEND": "<YOUR_BACKEND>",
        "DOCKER_HOST": "<YOUR_DOCKER_HOST>",
        "KUBECONFIG": "<YOUR_KUBECONFIG>",
        "NAMESPACE": "<YOUR_NAMESPACE>",
        "COMMIT_CONTAINER": "<YOUR_COMMIT_CONTAINER>",
        "KEEP_TEMPLATE": "<YOUR_KEEP_TEMPLATE>",
        "SANDBOX_NETWORK_MODE": "<YOUR_SANDBOX_NETWORK_MODE>",
        "SANDBOX_READ_ONLY": "<YOUR_SANDBOX_READ_ONLY>",
        "SANDBOX_CAP_DROP": "<YOUR_SANDBOX_CAP_DROP>",
        "SANDBOX_SECURITY_OPT": "<YOUR_SANDBOX_SECURITY_OPT>",
        "SANDBOX_MEMORY": "<YOUR_SANDBOX_MEMORY>",
        "SANDBOX_CPUS": "<YOUR_SANDBOX_CPUS>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "llm-sandbox-mcp": {
      "command": "uvx",
      "args": [
        "llm-sandbox==0.3.43"
      ],
      "env": {
        "BACKEND": "<YOUR_BACKEND>",
        "DOCKER_HOST": "<YOUR_DOCKER_HOST>",
        "KUBECONFIG": "<YOUR_KUBECONFIG>",
        "NAMESPACE": "<YOUR_NAMESPACE>",
        "COMMIT_CONTAINER": "<YOUR_COMMIT_CONTAINER>",
        "KEEP_TEMPLATE": "<YOUR_KEEP_TEMPLATE>",
        "SANDBOX_NETWORK_MODE": "<YOUR_SANDBOX_NETWORK_MODE>",
        "SANDBOX_READ_ONLY": "<YOUR_SANDBOX_READ_ONLY>",
        "SANDBOX_CAP_DROP": "<YOUR_SANDBOX_CAP_DROP>",
        "SANDBOX_SECURITY_OPT": "<YOUR_SANDBOX_SECURITY_OPT>",
        "SANDBOX_MEMORY": "<YOUR_SANDBOX_MEMORY>",
        "SANDBOX_CPUS": "<YOUR_SANDBOX_CPUS>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "llm-sandbox-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "llm-sandbox==0.3.43"
      ],
      "env": {
        "BACKEND": "<YOUR_BACKEND>",
        "DOCKER_HOST": "<YOUR_DOCKER_HOST>",
        "KUBECONFIG": "<YOUR_KUBECONFIG>",
        "NAMESPACE": "<YOUR_NAMESPACE>",
        "COMMIT_CONTAINER": "<YOUR_COMMIT_CONTAINER>",
        "KEEP_TEMPLATE": "<YOUR_KEEP_TEMPLATE>",
        "SANDBOX_NETWORK_MODE": "<YOUR_SANDBOX_NETWORK_MODE>",
        "SANDBOX_READ_ONLY": "<YOUR_SANDBOX_READ_ONLY>",
        "SANDBOX_CAP_DROP": "<YOUR_SANDBOX_CAP_DROP>",
        "SANDBOX_SECURITY_OPT": "<YOUR_SANDBOX_SECURITY_OPT>",
        "SANDBOX_MEMORY": "<YOUR_SANDBOX_MEMORY>",
        "SANDBOX_CPUS": "<YOUR_SANDBOX_CPUS>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "llm-sandbox-mcp": {
      "command": "uvx",
      "args": [
        "llm-sandbox==0.3.43"
      ],
      "env": {
        "BACKEND": "<YOUR_BACKEND>",
        "DOCKER_HOST": "<YOUR_DOCKER_HOST>",
        "KUBECONFIG": "<YOUR_KUBECONFIG>",
        "NAMESPACE": "<YOUR_NAMESPACE>",
        "COMMIT_CONTAINER": "<YOUR_COMMIT_CONTAINER>",
        "KEEP_TEMPLATE": "<YOUR_KEEP_TEMPLATE>",
        "SANDBOX_NETWORK_MODE": "<YOUR_SANDBOX_NETWORK_MODE>",
        "SANDBOX_READ_ONLY": "<YOUR_SANDBOX_READ_ONLY>",
        "SANDBOX_CAP_DROP": "<YOUR_SANDBOX_CAP_DROP>",
        "SANDBOX_SECURITY_OPT": "<YOUR_SANDBOX_SECURITY_OPT>",
        "SANDBOX_MEMORY": "<YOUR_SANDBOX_MEMORY>",
        "SANDBOX_CPUS": "<YOUR_SANDBOX_CPUS>"
      }
    }
  }
}

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