Arkheia Hallucination Detection

Detect fabrication and hallucination in any LLM output. Score responses from GPT-4o, Claude, Gemini, Llama and 30+ models. Free tier included.

GitHub

Arkheia MCP Server — Fabrication Detection for LLMs

Detect fabrication (hallucination) in any LLM output. Free tier included (1,500 detections/month).

Quick Start

1. Clone and install

git clone https://github.com/arkheiaai/arkheia-mcp.git ~/.arkheia-mcp
cd ~/.arkheia-mcp
pip install -r requirements.txt

2. Get an API key (free)

curl -X POST https://arkheia-proxy-production.up.railway.app/v1/provision \
  -H "Content-Type: application/json" \
  -d '{"email": "[email protected]"}'

3. Add to Claude Desktop

Edit your config file:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%\Claude\claude_desktop_config.json
{
  "mcpServers": {
    "arkheia": {
      "command": "python",
      "args": ["-m", "mcp_server.server"],
      "cwd": "~/.arkheia-mcp",
      "env": {
        "PYTHONPATH": "~/.arkheia-mcp",
        "ARKHEIA_API_KEY": "ak_live_YOUR_KEY_HERE"
      }
    }
  }
}

On Windows, replace ~/.arkheia-mcp with the full path (e.g. C:/Users/YourName/.arkheia-mcp).

4. Restart Claude

The arkheia_verify and arkheia_audit_log tools will appear automatically.

Tools

ToolDescription
arkheia_verifyScore any model output for fabrication risk (LOW/MEDIUM/HIGH)
arkheia_audit_logReview detection history
run_grokCall xAI Grok + screen for fabrication
run_geminiCall Google Gemini + screen for fabrication
run_togetherCall Together AI (Kimi, DeepSeek) + screen
run_ollamaCall local Ollama model + screen
memory_store / memory_retrieve / memory_relatePersistent knowledge graph

Pricing

  • Free: 1,500 detections/month (no credit card)
  • Single Contributor: $99/month (unlimited)
  • Professional: $499/month (20 concurrent)
  • Team: $1,999/month (50 concurrent)

Requirements

  • Python 3.10+
  • Git

Full Setup Guide

See AGENTS.md for detailed instructions, troubleshooting, and environment variables.

Links

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