Transparent MCP proxy with OpenTelemetry tracing and configurable storage
Connect Heimdall MCP to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Transparent MCP proxy with OpenTelemetry tracing and configurable storage. The heimdall mcp mcp server is what makes that connection.
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.
The server ships on npm as @cardor/heimdall-mcp, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
Scope — PathLocal — {project-root}/heimdall.config.{ts,js,mjs,cjs,json}Global — ~/.config/heimdall/heimdall.config.{ts,js,mjs,cjs,json}Rule — BehaviorField — TypeisPath — booleanallow_pattern — string \deny_pattern — string \array_mode — 'all' \case_sensitive — booleanwarn_only — booleanPattern — MeaningPlenty of file and storage access servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Heimdall MCP's toolset — Scope, Local, Global and 11 more — is a fair guide to whether it matches your workflow. It is maintained by enmanuelmag; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Heimdall MCP's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Scope | Path |
| Local | {project-root}/heimdall.config.{ts,js,mjs,cjs,json} |
| Global | ~/.config/heimdall/heimdall.config.{ts,js,mjs,cjs,json} |
| Rule | Behavior |
| Field | Type |
| isPath | boolean |
| allow_pattern | string \ |
| deny_pattern | string \ |
| array_mode | 'all' \ |
| case_sensitive | boolean |
| warn_only | boolean |
| Pattern | Meaning |
| resource | string |
| ttl | number |
{
"mcpServers": {
"heimdall": {
"command": "npx",
"args": ["-y", "@cardor/heimdall-mcp"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
Scoped local file access — read, write, search and reorganise files in directories you explicitly allow.
Search and read your Drive — Docs, Sheets and files become context your assistant can actually use.
Query, modify and analyse local SQLite databases in conversation — the fastest way to chat with a data file.
Build a programmable telecommunications stack for connecting telephony services with the Internet via a cloud-based utility.
Chat with your second brain — search, read and write vault notes through the Local REST API.
Connects AI models to an Obsidian knowledge base for direct access and manipulation of notes and folders.