enmanuelmag/heimdall-mcp

Overview

Heimdall MCP is a transparent proxy for MCP servers that adds OpenTelemetry tracing. It wraps any MCP server and persists trace data to SQLite, Postgres, or MySQL for observability.

Best for

Best for
Developers needing observability for MCP servers in production or debugging workflows

Use cases

• Add distributed tracing to existing MCP servers without code changes
• Debug MCP server behavior by inspecting persisted trace data
• Monitor MCP server performance in production environments

How to use

Install

npm install -g @cardor/heimdall-mcp

Tools exposed

• allow_pattern
• deny_pattern
• array_mode
• case_sensitive
• warn_only

Tested with

Claude Desktop, Cursor

Notes

Heimdall MCP is a transparent proxy for MCP servers that adds OpenTelemetry tracing. It wraps any MCP server and persists trace data to SQLite, Postgres, or MySQL for observability.

8 stars on GitHub. Last updated 2026-05-27.

Use cases

• Add distributed tracing to existing MCP servers without code changes
• Debug MCP server behavior by inspecting persisted trace data
• Monitor MCP server performance in production environments

Pros

• Works with any MCP server as a drop-in proxy
• Supports multiple storage backends (SQLite, Postgres, MySQL)
• Lightweight TypeScript implementation

Cons

• Small community with only 8 GitHub stars
• Limited documentation and examples
• Requires separate OpenTelemetry collector setup for advanced use

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.