# JavaScript WebAssembly Tools

> Use this tool when you need to extend AI capabilities with custom functionality in WebAssembly-compatible environments, enabling access to external tools through a standardized interface. It solves problems such as limited AI functionality and lack of customization, providing a modular architecture with ready-to-use tools and a developer-friendly SDK. With JSON-RPC communication and asynchronous operation support, it offers a flexible interface for registering and managing custom tools.

Canonical page: https://skillsregistry.net/skills/justin-echternach-js  
JSON: https://api.skillsregistry.net/v1/skills/justin-echternach-js

## Description

JavaScript MCP Server Component provides a WebAssembly-based implementation of the Model Context Protocol, enabling AI assistants to access external tools through a standardized interface. Built with a modular architecture, it includes ready-to-use tools like echo, knowledge graph querying, and HTTP requests, while offering a developer-friendly SDK for creating custom tools. The server handles JSON-RPC communication, manages tool registration, and supports asynchronous operations, making it particularly valuable for developers who need to extend AI capabilities with custom functionality in WebAssembly-compatible environments.

## Trust

- **Trust score (0–1):** 0.50
- **Verification tier:** unverified

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-04-25

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/justin-echternach-js)
- **Repository:** <https://github.com/justin-echternach/js-mcp-server>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "justin-echternach-js"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/justin-echternach-js` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/justin-echternach-js/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt