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wasm-agent — Claude Code skill: what it does, how to install

Creates and manages isolated WebAssembly agents for running untrusted code safely without host filesystem access.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add ruvnet/ruflo --skill wasm-agent -a claude-code
Open on GitHub

What wasm-agent does

The skill configures and manages sandboxed WebAssembly agents through the ruflo-core MCP plugin. Because each agent executes entirely within a WASM sandbox, untrusted code cannot touch the host operating system or its files.

It covers the complete agent lifecycle. You can create instances with custom settings, send prompts, grant specific tools, and inspect files in sandbox storage. Running agents can be monitored or terminated when tasks finish. Configured agents can also be exported as portable packages for any standard WASM runtime.

Direct local filesystem access is blocked by design. Any data your agent needs must be loaded into the sandbox through the provided file management tools.

What it helps with

  • run untrusted code in an isolated WebAssembly sandbox
  • experiment with agent behaviors without risking host files
  • manage files and tool access inside a sandboxed environment
  • export configured agents for execution on external WASM runtimes

Example prompts for the agent

  • Create a new WASM agent and show running instances
  • Send a prompt to the sandboxed agent and inspect output files
  • Terminate the running WASM agent

How to install wasm-agent

1Skills CLI (Vercel)

npx skills add ruvnet/ruflo --skill wasm-agent -a claude-code

2Manually: put the files in place

~/.claude/skills/wasm-agent/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/wasm-agent/

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Questions about wasm-agent

How to install wasm-agent in Claude Code?

Run npx skills add ruvnet/ruflo --skill wasm-agent -a claude-code. The skill will be configured in ~/.claude/skills/wasm-agent/SKILL.md.

What does wasm-agent do?

It provisions isolated agents running inside WebAssembly. This lets you execute untrusted scripts and test agent interactions safely.

Can the WASM agent modify host files?

No, agents operate in full isolation and cannot reach your host filesystem. File operations are restricted entirely to the internal sandbox storage.

Source text

SKILL.md · MIT 
---
name: wasm-agent
description: Create and manage sandboxed WASM agents for isolated code execution
argument-hint: "<create|list|prompt|terminate> [options]"
allowed-tools: mcp__plugin_ruflo-core_ruflo__wasm_agent_create mcp__plugin_ruflo-core_ruflo__wasm_agent_list mcp__plugin_ruflo-core_ruflo__wasm_agent_prompt mcp__plugin_ruflo-core_ruflo__wasm_agent_tool mcp__plugin_ruflo-core_ruflo__wasm_agent_files mcp__plugin_ruflo-core_ruflo__wasm_agent_export mcp__plugin_ruflo-core_ruflo__wasm_agent_terminate Bash
---

# WASM Agent

Create sandboxed agents that run in WebAssembly for safe, isolated execution.

## When to use

When you need to run untrusted code, experiment with agent configurations, or create portable agents that run anywhere WASM is supported.

## Steps

1. **Create agent** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_create` with agent configuration
2. **Send prompt** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_prompt` to interact with the agent
3. **Use tools** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_tool` to give the agent access to specific tools
4. **Manage files** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_files` to read/write files in the sandbox
5. **Export** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_export` to package the agent for sharing
6. **List agents** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_list` to see all running WASM agents
7. **Terminate** — call `mcp__plugin_ruflo-core_ruflo__wasm_agent_terminate` to stop an agent

## Benefits

- Full sandbox isolation — agents cannot access the host filesystem
- Portable — export and run on any WASM runtime
- Reproducible — same behavior across platforms
- Safe — no risk of system damage from agent actions

© ruvnet · MIT · ruvnet/ruflo

See also

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