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Umbryn Mcp

io.github.Rinava/umbryn-mcp ยท v0.2.1

Redacts PII/PHI from text before it reaches an LLM. Fail-closed, self-hosted, no egress.

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add umbryn-mcp -e UMBRYN_ENGINE=<UMBRYN_ENGINE> -e UMBRYN_MIN_CONFIDENCE=<UMBRYN_MIN_CONFIDENCE> -e UMBRYN_DETECTION_FLOOR=<UMBRYN_DETECTION_FLOOR> -- uvx umbryn-mcp==0.2.1
claude_desktop_config.json
{
  "mcpServers": {
    "umbryn-mcp": {
      "command": "uvx",
      "args": [
        "umbryn-mcp==0.2.1"
      ],
      "env": {
        "UMBRYN_ENGINE": "<UMBRYN_ENGINE>",
        "UMBRYN_MIN_CONFIDENCE": "<UMBRYN_MIN_CONFIDENCE>",
        "UMBRYN_DETECTION_FLOOR": "<UMBRYN_DETECTION_FLOOR>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "umbryn-mcp": {
      "command": "uvx",
      "args": [
        "umbryn-mcp==0.2.1"
      ],
      "env": {
        "UMBRYN_ENGINE": "<UMBRYN_ENGINE>",
        "UMBRYN_MIN_CONFIDENCE": "<UMBRYN_MIN_CONFIDENCE>",
        "UMBRYN_DETECTION_FLOOR": "<UMBRYN_DETECTION_FLOOR>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "umbryn-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "umbryn-mcp==0.2.1"
      ],
      "env": {
        "UMBRYN_ENGINE": "<UMBRYN_ENGINE>",
        "UMBRYN_MIN_CONFIDENCE": "<UMBRYN_MIN_CONFIDENCE>",
        "UMBRYN_DETECTION_FLOOR": "<UMBRYN_DETECTION_FLOOR>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
UMBRYN_ENGINE
Optional		Detection engine: auto (default), regex, or presidio
UMBRYN_MIN_CONFIDENCE
Optional		Trust threshold (0-1); detections below it fail closed. Default 0.5
UMBRYN_DETECTION_FLOOR
Optional		Sensitivity floor (0-1); below this a signal is noise. Default 0.35

Details

Package[email protected] (PYPI, stdio)
First published13 Aug 2026
Last updated13 Aug 2026
Registry nameio.github.Rinava/umbryn-mcp

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