tc39-mcp
io.github.xyzzylabs/tc39-mcp
Independent MCP server for the TC39 specs (ECMA-262 + ECMA-402): clauses, search, diffs, history.
Description as published in the official MCP registry.
Answers the MCP handshake and lists its tools. Checked 2026-10-04.
What we measured
| Endpoint | https://mcp.xyzzylabs.ai/tc39/mcp | registry |
|---|---|---|
| Handshake | Answers the MCP handshake and lists its tools (596 ms) | our check, 2026-10-04 |
| Protocol version | 2024-11-05 | our check, 2026-10-04 |
| Tools (17) | spec.about, clause.get, clause.list, spec.search, proposal.list, proposal.get, spec.grammar, spec.tables, spec.sdo_index, clause.outline, spec.global_search, spec.snapshots, spec.symbol_resolve, spec.well_known_intrinsics, spec.diff, spec.crossrefs, test262.search | tools/list, 2026-10-04 |
| GitHub stars | 2 | github.com/xyzzylabs/tc39-mcp |
| Last push | 2026-10-03 | GitHub API |
| Licence | MIT | GitHub API |
| Registry version | 0.6.3 · active · updated 2026-09-08 | registry |
| Package | npm: tc39-mcp | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows a real call went through, not just an opinion. How to file one.
Connect
claude mcp add --transport http tc39-mcp https://mcp.xyzzylabs.ai/tc39/mcpnpx -y tc39-mcpCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
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