lihtness/gnomon-mcp

What it does

Gnomon MCP is a Model Context Protocol server that provides LLM agents with reliable, deterministic tools for handling dates, times, calendar operations, and mathematical calculations. It eliminates the common problem of LLMs hallucinating or incorrectly guessing dates and mathematical results by offering a robust backend for these deterministic operations.

Key features

• Rich now() snapshot with 18 fields for comprehensive temporal context
• Calendar operations dispatcher supporting diff, until, since, add, weekday, and business days calculations
• Natural language parsing for calendar queries
• calc() tool for Python expression evaluation with math and stats libraries preloaded
• Batch processing capabilities for multiple operations
• Cross-platform support (macOS, Windows, Linux)

How to set up

Gnomon MCP is installed as a Python-based MCP server. Add it to your MCP configuration with the appropriate server settings for your Claude or compatible client. Detailed setup instructions are available in the GitHub repository. Once configured, the tools are automatically available to your LLM agent through the MCP protocol.