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Harmony MCP Server

ES5 shim for ES6 (ECMAScript 6) Reflect and Proxy objects

Remote serverstreamable-httpPython

What is the Harmony MCP Server?

ES5 shim for ES6 (ECMAScript 6) Reflect and Proxy objects

The short version

Read Why should I use this library?

More MCP options

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Recorded tools

Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.

ToolWhat it does
iojs-harmony_proxies (>= 2.3.0)
membraneswrappers that transitively isolate two object-graphs.
observera self-hosted implementation of the ES7 Object.observe notification mechanism.
profilera simple profiler to collect usage statistics of an object.

How to install the Harmony MCP Server

{
  "mcpServers": {
    "harmony": {
      "command": "npx",
      "args": ["-y", "harmony-reflect"]
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Example prompts to try

  • “Use Harmony to iojs.”
  • “Use Harmony to membranes.”
  • “Use Harmony to observer.”

Frequently asked questions

ES5 shim for ES6 (ECMAScript 6) Reflect and Proxy objects Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.

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