touchstone-mcp 0.1.0

Model Context Protocol server for Touchstone: hallucination detection for LLM outputs without calling another LLM. Wraps the calibrated Verifier and the raw measurement orchestrator from the clarethium-touchstone reference implementation as MCP tools.

touchstone-mcp

Model Context Protocol server for Touchstone: hallucination detection for LLM outputs without calling another LLM.

touchstone-mcp exposes the calibrated Verifier and the raw measurement orchestrator from the clarethium-touchstone reference implementation as MCP tools. Any MCP host (Claude Desktop, Claude Code, Cursor, custom) can attach it as a stdio MCP server.

Install

pip install touchstone-mcp

fastmcp and clarethium-touchstone install transitively. The touchstone-mcp console script is registered automatically and runs on the stdio transport by default.

Host config

Drop this into your MCP host config:

{
  "mcpServers": {
    "touchstone": {
      "command": "touchstone-mcp"
    }
  }
}

For Claude Code: claude mcp add touchstone touchstone-mcp.

Tools exposed

• verify — calibrated (text, source) hallucination probability with scope classification, signal breakdown, and span-level localization.
• measure — raw multi-layer Touchstone output (all eleven Section 5 measurement layers).
• assess_derivation_regime — Layer 11 standalone regime classifier.
• list_modes — enumerate the four Verifier modes with their required inputs.

See the host wiring guide for full tool reference, scope semantics, and threshold guidance.

Programmatic use

from touchstone_mcp import build_server

server = build_server()
server.run()                 # stdio transport

Version pairing

touchstone-mcp depends on clarethium-touchstone>=0.2.0. The MCP server is a thin wrapper around the library's public surface; measurement semantics and calibration coefficients are defined and tested in the library, not here.

License

Apache-2.0. See LICENSE.