Mantora is a Open-Source local-first MCP observer: a lightweight UI + proxy for inspecting LLM data access (sessions, tool calls, results) with protective defaults.
https://github.com/josephwibowo/mantora-mcp
Mantora sits between your LLM client (Claude/Cursor) and the target MCP server (DuckDB/Postgres). It intercepts JSON-RPC messages to log traffic and enforce safety policies.