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AI · April 18, 2026

prolog-reasoner

Give your LLM a logic engine — SWI-Prolog as an MCP server

prolog-reasoner launched on April 18, 2026.

What it does

LLMs are great at language but bad at logic. Ask Claude to solve SEND + MORE = MONEY and it guesses wrong. prolog-reasoner gives LLMs access to SWI-Prolog via MCP. The LLM writes Prolog, Prolog solves it, the answer comes back correct and debuggable. Results on 30 logic problems: 73% → 90% accuracy. The gain is in constraint satisfaction and multi-step reasoning — where guessing fails. MCP server for Claude Desktop, Claude Code, Cursor. Rule bases for reusable domain logic. Open source (MIT).

SWI-Prolog as a logic calculator for LLMs — MCP server and Python library - rikarazome/prolog-reasoner

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