# Tc39

> Independent MCP server for the TC39 specs (ECMA-262 + ECMA-402): clauses, search, diffs, history.

## Facts
- Page: https://tashan.sh/capability/pkg-tc39-mcp
- tashan id: pkg:tc39-mcp
- Source: https://github.com/xyzzylabs/tc39-mcp
- npm: https://www.npmjs.com/package/tc39-mcp
- Type: npm
- Category: design
- tashan score: 60.0 / 100
- Adoption: 33.0
- Upkeep: 69.0
- Freshness: 97.0
- Evidence coverage: 100% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- npm downloads: 245/week
- Official: no

## Install

```sh
claude mcp add tc39 -- npx -y tc39-mcp
```

## Security audit
- Known advisories: 0
- Install-time script: none declared
- Build provenance: attested

Permissions are read from DECLARED dependencies only. Nothing is executed, so an empty result means "nothing declared", never "nothing possible".

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Measured 2026-08-15 by tashan (https://tashan.sh) from public evidence. Scorer s5.