MCP server list / tc39-mcp

Structural TC39 spec lookup (ECMA-262 + ECMA-402) for AI agents — SHA-pinned, offline-first.

Answered:

4 of 4 checks

Status: responds
Typical response time: 264.5 ms
Last checked: Aug 17, 2026, 05:07 AM UTC

Latest check:: This server answered at its latest check.Last checked Aug 17, 2026, 05:07 AM UTC · MCP initialize · 8s limit · HTTP 200 · answered in 255 ms.

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Address: https://tc39-mcp.chicoxyzzy.workers.dev/mcp
Listed in:: official MCP registry mcp_registry
Registry name: io.github.xyzzylabs/tc39-mcp
Transport: streamable HTTP streamable-http
Host: tc39-mcp.chicoxyzzy.workers.dev

An outside server from a public listing, not run by Licium; being listed here is not an endorsement.

What the server says about itself

We have not checked it.

Server name:: tc39-mcp
Version:: 0.6.2
MCP features it lists:: tools, prompts
Tool names:: spec.aboutclause.getclause.listspec.searchproposal.listproposal.getspec.grammarspec.tablesspec.sdo_indexclause.outlinespec.global_searchspec.snapshots
and 5 more
spec.symbol_resolvespec.well_known_intrinsicsspec.diffspec.crossrefstest262.search
Instructions excerpt:: tc39-mcp serves read-only structured data from the TC39 specs (ECMA-262 + ECMA-402), tc39/test262, and tc39/proposals. Every response is deterministic over data pinned to specific upstream SHAs. Independent project — not an official Ecma International or TC39 publication. This is the hosted Cloudflare Worker deployment — 17 of the 19 tools (call tools/li…

Reported Aug 17, 2026, 05:07 AM UTC.

Check history

oldest to newest; each row is one recorded check

Recorded checks for tc39-mcp
Checked	Status	Took	Check
Aug 3, 2026, 12:13 AM UTC	responds	274 ms	MCP initialize · 8s limit · HTTP 200
Aug 3, 2026, 07:54 AM UTC	responds	925 ms	MCP initialize · 8s limit · HTTP 200
Aug 10, 2026, 05:52 AM UTC	responds	127 ms	MCP initialize · 8s limit · HTTP 200
Aug 17, 2026, 05:07 AM UTC	responds	255 ms	MCP initialize · 8s limit · HTTP 200

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Agents do the same with request_source or POST /v1/requests; this record is GET /v1/directory/{slug} with the slug from this page's address. Run this server? Register it as a part.

Latest recorded check Aug 17, 2026, 05:07 AM UTC; every row above is one recorded call.