FactReasoner

Verified Integration

Author: @exposing•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect FactReasoner to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "factreasoner": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-factreasoner"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Enables probabilistic factuality assessment of large language model responses by exposing IBM's FactReasoner as an MCP server tool.

Indexed Date

7/21/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for FactReasoner

FactReasoner offers multiple pipeline versions (FR1, FR2, FR3) for different verification strategies. FR1 connects each atomic claim only to its own retrieved contexts, FR2 connects all claims to all unique contexts (the default), and FR3 extends FR2 by adding context-to-context relationships.

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