AI models do not calculate. They predict the most probable next token. When the token is a number, it is often close, and sometimes wrong. The error compounds downstream. Euclid is a deterministic computation service for AI agents. It provides 10 tools via a single MCP connection: - calculate: arithmetic, percentages, exponents, trig, logarithms - convert: unit conversions across 1,000+ unit pairs - statistics: mean, median, mode, variance, standard deviation, percentile -