LLM Sandbox MCP Server

Securely Execute LLM-Generated Code with Ease LLM Sandbox is a lightweight and portable sandbox environment designed to run Large Language Model (LLM) generated code in a safe and isolated mode. It provides a secure execution environment for AI-generated code while offering flexibility in container backends and comprehensive language support, simplifying the process of running code generated by LLMs. Its 3 documented tools cluster into read & search, run & execute.

People who work with code generation, large language models and llm sandbox and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-14 · ★ 1,121 · #3 OF 229 MAINTAINED CODING AGENT · VERIFIED 2026-09-18

MIT · Python servers · how we verify → /methodology

01 · Install LLM Sandbox

before you install - you'll need

Set DOCKER_HOST, SANDBOX_NETWORK_MODE, SANDBOX_READ_ONLY, SANDBOX_CAP_DROP, SANDBOX_SECURITY_OPT, SANDBOX_MEMORY, SANDBOX_CPU_COUNT before connecting.

Claude Code

claude mcp add vndee-llm-sandbox -- uvx llm-sandbox

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "vndee-llm-sandbox": {
      "command": "uvx",
      "args": [
        "llm-sandbox"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

pypi package llm-sandbox - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.vndee is GitHub-verified and matches the repo owner

03 · What LLM Sandbox can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can execute code in a secure sandbox with automatic visualization capture, and get detailed information about a specific language.

The 3 tools it gives your agent

Extracted from the project's README - what LLM Sandbox lets an agent do.

execute_code: - Execute code in a secure sandbox with automatic visualization capture
get_supported_languages: - Get the list of supported programming languages
get_language_details: - Get detailed information about a specific language

Latest releases

0.3.44 · 2026-08-03

Add JOSS required sections to the paper · Open a PR from the citation job instead of pushing to main · Point the registry entry at 0.3.43 · Add agent SDK integrations and repair the broken ones · Smoke-check the agent…

0.3.43 · 2026-08-03

Fixes a broken MCP install · mcp 2.0.0 removed mcp.server.fastmcp, which the MCP server imports at module scope. The extras allowed it through an unbounded mcp>=1.10.0, so any fresh install since mcp 2.0.0 shipped…

0.3.42 · 2026-08-02

Add MCP registry manifest, JOSS paper, and narrative docs page

04 · Who maintains LLM Sandbox

LLM Sandbox is maintained by vndee. It's the only MCP server we track from this author; the repo dates to Jun 2024.

05 · Facts

repository: github.com/vndee/llm-sandbox
website: https://vndee.github.io/llm-sandbox/
category: coding agent - ranked #3 of 229 actively-maintained coding agent servers as of 2026-09-18.
release cadence: 5 releases in the last 90 days (latest 2026-08-03)
registry: io.github.vndee/llm-sandbox (active, first published 2026-08-02 · 2 versions)
packages: pypi:llm-sandbox

06 · LLM Sandbox FAQ

Is LLM Sandbox still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-14 and it shipped 5 releases in the last 90 days. We re-verify nightly.

What can LLM Sandbox do?

With this server connected, an agent can execute code in a secure sandbox with automatic visualization capture, and get detailed information about a specific language.

How do I install LLM Sandbox?

Run `uvx llm-sandbox`. The README documents 7 environment variables (DOCKER_HOST, SANDBOX_NETWORK_MODE, SANDBOX_READ_ONLY…) to set first. Set DOCKER_HOST, SANDBOX_NETWORK_MODE, SANDBOX_READ_ONLY, SANDBOX_CAP_DROP, SANDBOX_SECURITY_OPT, SANDBOX_MEMORY, SANDBOX_CPU_COUNT before connecting. You can also paste the ready-made client config above.

Does LLM Sandbox run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to LLM Sandbox

Alternatives to LLM Sandbox

Maintained coding agent servers if LLM Sandbox isn't the fit.

Pairs well with

Servers that cover what LLM Sandbox doesn't - only shown when the pairing reason fits the companion.

head to head · Serena vs LLM Sandbox · LLM Sandbox vs Desktop Commander · Ouroboros vs LLM Sandbox

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