Open-source transparent proxy and terminal UI for debugging MCP traffic between AI clients and MCP servers. Described as Wireshark for MCP, it inserts into the data path and shows every JSON-RPC call, response, notification, and server stderr live in a TUI. Features include latency tracking, error highlighting, request replay against fresh server copies, stream filtering by tool, status, direction, and kind, search within frames, and a live timer on pending calls. Single-binary Go tool requiring zero configuration changes to servers. MIT licensed.