@cardor/heimdall-mcp
Transparent proxy for any MCP server. Intercepts all JSON-RPC messages, measures latency, stores traces in a configurable database, and enforces per-server allow/deny policies — without touching the original server.
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Table of Contents
- @cardor/heimdall-mcp
How it works
flowchart LR
A["MCP Client\n(Claude Desktop / OpenCode / Cursor)"]
subgraph proxy["heimdall-mcp"]
B["TelemetryInterceptor"]
P["PolicyInterceptor"]
C["ForwardInterceptor"]
D[("SQLite\nPostgres\nMySQL")]
B --> P
P --> C
B -->|"saves span"| D
end
S["Real MCP server\n(subprocess / HTTP / SSE)"]
A -->|"stdio"| B
C -->|"stdio · http · sse"| S
S -->|"response"| C
C -->|"response"| A
