# tc39-mcp

> tc39-mcp — xyzzylabs-tc39-mcp. Use this tool when you need to access and navigate the ECMAScript specification, retrieve specific clauses, or search for test cases. It provides a structured JSON interface for AI agents to interact with the ECMA-262 and ECMA-402 specs, enabling efficient retrieval of information and cross-references. Ideal for use cases requiring precise specification lookups, edition comparisons, or test case searches via the Model Context Protocol.

Canonical page: https://skillsregistry.net/skills/xyzzylabs-tc39-mcp  
JSON: https://api.skillsregistry.net/v1/skills/xyzzylabs-tc39-mcp

## Description

Provides structured JSON access to the ECMAScript specification (ECMA-262 and ECMA-402) for AI agents, allowing clause retrieval, cross-references, edition diffs, and test262 search via the Model Context Protocol.

## Trust

- **Trust score (0–1):** 0.67
- **Verification tier:** scanned
- **Last scanned:** 2026-08-29

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** ai-ml
- **Updated:** 2026-08-29

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/cw63bid4z5)
- **Repository:** <https://github.com/xyzzylabs/tc39-mcp>

## 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": "xyzzylabs-tc39-mcp"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/xyzzylabs-tc39-mcp` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/xyzzylabs-tc39-mcp/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