Heimdall MCP

Heimdall functions as a transparent proxy designed for any MCP (Modular Command Processor) server, offering comprehensive observability without requiring server source code modifications. Key features include: - Captures all tool calls, resource reads, and prompts - Stores data as OpenTelemetry spans - Supports SQLite, Postgres, and MySQL databases - Easy integration with a single line in mcp.json - Visualizes traces in Jaeger UI This robust proxy intercepts every JSON-RPC message exchanged between your MCP client and the server. It meticulously measures latency and records input/output bodies, providing a detailed understanding of every interaction. Data is automatically stored in a database of your choice, maintaining a consistent schema across all supported options, making it simple to query with standard SQL clients. Heimdall enables real-time stream of spans to Jaeger via OTLP, offering a full trace waterfall enriched with attributes and event bodies for deep performance analysis. It supports various usage modes, including spawning your server as a child process via stdio, or connecting to HTTP and SSE servers, providing flexibility for different deployment scenarios. Built for developers and engineering teams, Heimdall is an essential Developers Tool for enhancing server monitoring and debugging. It's ideal for those seeking to gain deep insights into their MCP server's operations, optimize performance, and ensure service reliability without altering existing server implementations. This tool simplifies complex performance diagnostics and helps maintain system health.