@nevescloud/mcp-rtc

Reference implementation of the MCP-over-WebRTC specification.

Provides server- and client-side Transport classes that conform to the @modelcontextprotocol/sdk Transport interface, plus the lower-level host() / join() primitives for direct use.

Status

This package is the MCP Transport wrapper. As of 0.2.0, the host() / join() substrate — WebRTC pairing, lobby, signed pair-requests, browser+Node from one codebase via a runtime shim — lives in @nevescloud/stoa, which this package depends on and re-exports. @nevescloud/mcp-rtc keeps only the @modelcontextprotocol/sdk Transport classes on top.

The substrate was reconciled there from this package's earlier Node port and pip-relay's browser copy (both descended from the private jonasneves/signal client) into one canonical implementation.

Exports

import {
  WebRTCServerTransport,    // implements MCP SDK Transport, host side
  WebRTCClientTransport,    // implements MCP SDK Transport, client side
  host, join,               // lower-level WebRTC primitives
} from '@nevescloud/mcp-rtc';

Spec alignment

This package implements the spec's mandated Layer 1 (wire format), and uses the spec's recommended Layer 2 (lobby + pair-request via pip-relay-compatible signaling) and Layer 3 (signed pair-requests with P-256 ECDSA) by default. Layers 2 and 3 are configurable for use with alternative signaling / authentication mechanisms.

Companion package

@nevescloud/mcp-rtc-bridge-tab — browser library that takes an mcp-rtc server's tools and re-exposes them via WebMCP, making them callable by any local Claude with a Chrome extension.

License

MIT