flow-nexus-sandbox

flow-nexus-sandbox is a command for Claude Code from EarthmanWeb/claude-flow-plugin. It costs 15 tokens per session (487 once invoked), scanned A, a copy of flow-nexus-sandbox, MIT.

Commands for creating and managing isolated environments in which code can run. These environments can use Node.js, Python, React, Next.js, or basic setups.

In plain words
What is it for?
Use them to create a sandbox, execute JavaScript or other code, upload files, set environment variables, check running environments, stop them, or delete them.
Why use it?
They let you run code separately from your main machine or project and inspect its output and status.

Command for Claude Code

Part of the claude-flow plugin — 47 commands, 7 agents, 4 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/earthmanweb/claude-flow-plugin/sandbox
Clone the repo
git clone --depth 1 https://github.com/EarthmanWeb/claude-flow-plugin

Made for: Claude Code.

Or install claude-flow, the plugin that ships this one along with the rest of its 47 commands, 7 agents, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for flow-nexus-sandbox

README.md
[![agentmods](https://agentmods.dev/badge/commands/earthmanweb/claude-flow-plugin/sandbox.svg)](https://agentmods.dev/commands/earthmanweb/claude-flow-plugin/sandbox)
Your own site
<a href="https://agentmods.dev/commands/earthmanweb/claude-flow-plugin/sandbox"><img src="https://agentmods.dev/badge/commands/earthmanweb/claude-flow-plugin/sandbox.svg" alt="Measured on agentmods" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 487 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00015 $0.00487
Opus 5 $0.00008 $0.00244
Sonnet 5 $0.00003 $0.00097
Haiku 4.5 $0.00002 $0.00049

Measured 3d ago against content hash 6940ff3b42fa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flow-nexus-sandbox scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to flow-nexus-sandbox — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/commands/flow-nexus/sandbox.md · 83 lines

What it actually says

Flow Nexus Sandboxes

Deploy and manage isolated execution environments.

Create Sandbox

mcp__flow-nexus__sandbox_create({
  template: "node", // node, python, react, nextjs, vanilla, base
  name: "my-sandbox",
  env_vars: {
    API_KEY: "your_api_key",
    NODE_ENV: "development"
  },
  timeout: 3600 // seconds
})

Execute Code

mcp__flow-nexus__sandbox_execute({
  sandbox_id: "sandbox_id",
  code: `
    console.log('Hello from sandbox!');
    const result = await fetch('https://api.example.com');
    return result.json();
  `,
  language: "javascript",
  capture_output: true
})

Manage Sandboxes

// List all sandboxes
mcp__flow-nexus__sandbox_list({ status: "running" })

// Get status
mcp__flow-nexus__sandbox_status({ sandbox_id: "id" })

// Upload file
mcp__flow-nexus__sandbox_upload({
  sandbox_id: "id",
  file_path: "/app/data.json",
  content: JSON.stringify(data)
})

// Stop sandbox
mcp__flow-nexus__sandbox_stop({ sandbox_id: "id" })

// Delete sandbox
mcp__flow-nexus__sandbox_delete({ sandbox_id: "id" })

Templates

  • node: Node.js environment
  • python: Python 3.x environment
  • react: React development setup
  • nextjs: Next.js full-stack
  • vanilla: Basic HTML/CSS/JS
  • base: Minimal Linux environment

Common Patterns

// API development sandbox
mcp__flow-nexus__sandbox_create({
  template: "node",
  name: "api-dev",
  install_packages: ["express", "cors", "dotenv"],
  startup_script: "npm run dev"
})

// ML sandbox
mcp__flow-nexus__sandbox_create({
  template: "python",
  name: "ml-training",
  install_packages: ["numpy", "pandas", "scikit-learn"]
})
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 83 lines · 15 tokens per session scan A 6940ff3b42fa

Subscribe to this mod's changes

flow-nexus-sandbox is a command published in the GitHub repository EarthmanWeb/claude-flow-plugin (2 stars, last pushed 7mo ago), licensed MIT. It adds 15 tokens to every session and 487 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to flow-nexus-sandbox, differing in 0 lines, and is treated as a copy.