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Euclid-MCP: A Model Context Protocol Server for Deterministic Logical Reasoning via Prolog

Research LLM Agents

Merged summary

TL;DR - Euclid-MCP is an open-source MCP server that lets LLM agents delegate logical inference to SWI-Prolog. It improves reliability on large rule-based problems by returning deterministic answers, proof traces, and derivation logs.

  • Introduces Euclid-IR, a readable, engine-agnostic representation for Horn-clause logic.
  • Supports a translate-run-inspect-repair workflow through a compact MCP tool interface.
  • In an IT security and compliance evaluation, LLMs hallucinated on larger knowledge bases while Euclid-MCP produced exact answers with lower latency and more compact outputs.
  • Positions symbolic reasoning, rather than semantic RAG, as the appropriate mechanism for deterministic rule enforcement.

Sources (1)

Euclid-MCP: A Model Context Protocol Server for Deterministic Logical Reasoning via Prolog

arXiv cs.AI Bartolomeo Bogliolo 2026-07-23 arXiv:2607.21412

TL;DR - Euclid-MCP is an open-source MCP server that lets LLM agents delegate logical inference to SWI-Prolog. It improves reliability on large rule-based problems by returning deterministic answers, proof traces, and derivation logs.

  • Introduces Euclid-IR, a readable, engine-agnostic representation for Horn-clause logic.
  • Supports a translate-run-inspect-repair workflow through a compact MCP tool interface.
  • In an IT security and compliance evaluation, LLMs hallucinated on larger knowledge bases while Euclid-MCP produced exact answers with lower latency and more compact outputs.
  • Positions symbolic reasoning, rather than semantic RAG, as the appropriate mechanism for deterministic rule enforcement.
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