Sentinel MCP Server

MCP server for Sentinel AI safety seeds. Add alignment guardrails to any AI agent.

Features

• get_seed - Get a Sentinel alignment seed to use as system prompt
• wrap_messages - Wrap chat messages with safety seed
• analyze_content - Analyze content for potential safety issues
• list_seeds - List available seed versions

Installation

Using npx (recommended)

npx mcp-server-sentinelseed

Using npm

npm install -g mcp-server-sentinelseed
mcp-server-sentinelseed

Usage with Claude Desktop

Add to your Claude Desktop configuration (claude_desktop_config.json):

{
  "mcpServers": {
    "sentinel": {
      "command": "npx",
      "args": ["mcp-server-sentinelseed"]
    }
  }
}

Tools

get_seed

Get a Sentinel alignment seed to use as a system prompt.

// Parameters
{
  version: "v2_minimal" | "v2_standard" // default: "v2_standard"
}

// Returns the seed text

wrap_messages

Wrap chat messages with the safety seed as a system message.

// Parameters
{
  messages: [
    { role: "user", content: "Hello!" }
  ],
  version: "v2_minimal" | "v2_standard"
}

// Returns wrapped messages with seed prepended

analyze_content

Analyze content using THSP heuristics.

// Parameters
{
  content: "Text to analyze"
}

// Returns
{
  safe: boolean,
  gates: {
    truth: "pass" | "fail",
    harm: "pass" | "fail",
    scope: "pass" | "fail",
    purpose: "pass" | "fail"
  },
  issues: string[],
  confidence: number
}

list_seeds

List available seed versions with metadata.

// Returns
[
  { version: "v2_minimal", tokens: 450, protocol: "THSP (4 gates)" },
  { version: "v2_standard", tokens: 1400, protocol: "THSP (4 gates)" }
]

What is THSP?

THSP stands for Truth, Harm, Scope, Purpose - four gates that every action must pass:

1. TRUTH: Does this involve deception?
2. HARM: Could this cause harm?
3. SCOPE: Is this within appropriate boundaries?
4. PURPOSE: Does this serve legitimate benefit?

Seed Versions

| Version | Tokens | Best For | |---------|--------|----------| | v2_minimal | ~450 | Chatbots, low latency | | v2_standard | ~1,400 | General use (recommended) |

Links

• Website: sentinelseed.dev
• Documentation: sentinelseed.dev/docs
• npm Package: npmjs.com/package/sentinelseed
• PyPI Package: pypi.org/project/sentinelseed
• HuggingFace: huggingface.co/sentinelseed

License

MIT License - Sentinel Team