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tc39-mcp

https://mcp.xyzzylabs.ai/tc39/mcp

answers a handshake

Registry name: io.github.xyzzylabs/tc39-mcp
Reports itself as: tc39-mcp 0.6.2
Protocol version: 2024-11-05
Transport: streamable-http
HTTP status: 200
Latency: 180 ms
Tools: 17
Checked: 2026-09-06T08:27:10Z

Tools it reports

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

Check it yourself

curl -s -X POST https://mcp.xyzzylabs.ai/tc39/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"you","version":"0"}}}'