Claude Code

tc39-mcp for Claude Code

io.github.xyzzylabs/tc39-mcp

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

client:Claude Code transport:streamable-http runtime:npm tools:17

Install tc39-mcp in Claude Code

run in your project directory

claude mcp add --transport http tc39-mcp https://mcp.xyzzylabs.ai/tc39/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

What Claude Code can do once it is connected

tc39-mcp in other clients

tc39-mcp MCP server