MCP Servers

r33drichards/mcp-js

Name: r33drichards/mcp-js
Author: Various

MCP server that exposes a V8 JavaScript runtime as a tool for AI agents like Claude and Cursor.

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Our verdict

Not reviewed yet

We have not reviewed r33drichards/mcp-js yet

No one at Enterprise DNA has checked this listing against its sources. The description comes from public listings gathered automatically. Any fact below shows where it came from and when it was last checked.

How we review records

From the listing

About r33drichards/mcp-js

An MCP server that exposes a V8 JavaScript runtime as a tool for AI agents such as Claude and Cursor. It supports persistent heap snapshots via S3 or the local filesystem, enabling state to survive restarts. The server is written in Rust and designed for integration with modern AI development environments.

Best for

Developers building AI agents that need to execute and persist JavaScript state

Use cases

Executing JavaScript code from AI agents during conversations
Persisting runtime state across sessions using heap snapshots
Integrating JavaScript execution into Claude or Cursor workflows

Notes

43 stars on GitHub. Last updated 2026-06-01. Licensed AGPL-3.0.

Pros

Written in Rust for performance and safety
Persistent heap snapshots allow state to survive restarts
Designed for direct integration with popular AI agents like Claude and Cursor

Cons

Small community with only 43 stars, limited testing and support
Requires MCP-compatible agents, not a standalone runtime
Relies on S3 or local filesystem for snapshot storage, adding external dependencies

Key facts

What we have checked

Not checked yet. Dated facts such as prices, releases and repository activity appear here once we have confirmed them from a source.

How to use

How to set it up

As the listing publishes it. We have not run this install.

Install

curl -fsSL https://raw.githubusercontent.com/r33drichards/mcp-js/main/install.sh | sudo bash

Tools exposed

run_js
get_execution
get_execution_output
cancel_execution
list_executions
list_sessions
list_session_snapshots
get_heap_tags

Clients the listing names (not checked here)

Claude Desktop, Claude Code, Cursor

Example client config

{
  "mcpServers": {
    "js": {
      "command": "mcp-v8",
      "args": [
        "--stateless"
      ]
    }
  }
}

Install

Add r33drichards/mcp-js to your client

Not verified yet

Our lab has not run this server yet. "Config checked" on a client means the recipe matches that client's documented config format; it does not mean we ran it.

Claude Code

Config checked

Run in your terminal (runs on your computer)

claude mcp add --transport stdio r33drichards-mcp-js -- docker run -i --rm --env PORT= docker.io/wholelottahoopla/mcp-js:0.22.0

Version 0.22.0 · From the Official MCP registry, read 24 Oct 2026 · Format checked against Claude Code's config docs

Claude Desktop

Config checked

Add to claude_desktop_config.json (runs on your computer)

{
  "mcpServers": {
    "r33drichards-mcp-js": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "--env",
        "PORT=",
        "docker.io/wholelottahoopla/mcp-js:0.22.0"
      ]
    }
  }
}

Version 0.22.0 · From the Official MCP registry, read 24 Oct 2026 · Format checked against Claude Desktop's config docs

Cursor

Config checked

Add to .cursor/mcp.json (runs on your computer)

{
  "mcpServers": {
    "r33drichards-mcp-js": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "--env",
        "PORT=",
        "docker.io/wholelottahoopla/mcp-js:0.22.0"
      ]
    }
  }
}

Version 0.22.0 · From the Official MCP registry, read 24 Oct 2026 · Format checked against Cursor's config docs

VS Code

Config checked

Add to .vscode/mcp.json (runs on your computer)

{
  "servers": {
    "r33drichards-mcp-js": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "--env",
        "PORT=",
        "docker.io/wholelottahoopla/mcp-js:0.22.0"
      ]
    }
  }
}

Version 0.22.0 · From the Official MCP registry, read 24 Oct 2026 · Format checked against VS Code's config docs

Codex

Config checked

Add to ~/.codex/config.toml (runs on your computer)

[mcp_servers.r33drichards-mcp-js]
command = "docker"
args = ["run", "-i", "--rm", "--env", "PORT=", "docker.io/wholelottahoopla/mcp-js:0.22.0"]

Version 0.22.0 · From the Official MCP registry, read 24 Oct 2026 · Format checked against Codex's config docs

ChatGPT: ChatGPT connects only to remote servers that need no API key.

Recipes come from the server's entry in the official MCP registry. Check the package name before you run it, and keep keys out of shared files.

Works with

What r33drichards/mcp-js connects to

5 clients, each with how we know and when we checked.

Works with	Type	How we know	Checked
Claude Code	Client	Install recipe matches the client's documented formatRuns locally, version 0.22.0Config checked	24 Oct 2026Claude Code docs
Claude Desktop	Client	Install recipe matches the client's documented formatRuns locally, version 0.22.0Config checked	24 Oct 2026Claude Desktop docs
Cursor	Client	Install recipe matches the client's documented formatRuns locally, version 0.22.0Config checked	24 Oct 2026Cursor docs
VS Code	Client	Install recipe matches the client's documented formatRuns locally, version 0.22.0Config checked	24 Oct 2026VS Code docs
Codex	Client	Install recipe matches the client's documented formatRuns locally, version 0.22.0Config checked	24 Oct 2026Codex docs

Sources

Where this comes from

No sources recorded yet. Each source we check is listed here with the date we checked it.

A source shows what was published when we checked it. It does not certify security, performance or a working installation. Read our method.

Changelog

What changed

No changes recorded yet. Releases, price changes and deprecations appear here, with their dates, once we track them for this record.

Pairs with

Other entries in the index that connect to this one. Click through to see the chain.

Pairs with1 entry

MMCPlowCatalogue

pydantic/pydantic-ai/mcp-run-python

Various

AI Agent Framework, the Pydantic way

★ 17,445

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