Debugging and protocol-tracing wrapper for stdio-based MCP servers, published on npm with 34 versions (currently 1.9.2).

• Relays server stdout to the client byte-for-byte while tracing every request and response with latency and protocol anomalies

• Four subcommands: run, replay, stats (latency percentiles), and doctor

• Fixed a request-id collision between client- and server-initiated requests, secret-redaction leaks, and UTF-8 corruption across chunk boundaries (Thai, CJK, emoji)

• Fully automated releases with npm Trusted Publishing (OIDC, no stored token) and SHA-pinned GitHub Actions

• Zero runtime dependencies