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tc39-mcp
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.
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// key findings
✅
19 tools verified — handlers match their declared behaviour
19 read-only tools verified — handlers contain no write/delete/exec
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// required environment variables
This server reads these from
process.env. You'll be asked to provide them before it can run.config
GITHUB_OUTPUTconfig
TC39_MCP_BASE_URL— the base URL via to point at a private mirrorconfig
TC39_MCP_LRUconfig
XDG_CACHE_HOME— The cache lives at $/tc39-mcp (or// full audit trail
The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.
// improvement guidance — verified publishers only
We have 5 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[](https://m8ven.ai/mcp/xyzzylabs-tc39-mcp-1mcx8i)commit: db3fa32144d6b2a4dbc8fae2132e9d9698e140dc
code hash: 0d9e56013cd847bb7757d8960e29b9d9ad4a871c1b82eb910840a05727794fa8
verified: 7/30/2026, 8:43:57 AM