Euclid

Name: Euclid
Author: euclidtools

@euclidtools

About Euclid

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.

#math #computation #deterministic #calculator #unit-conversion #statistics #finance #datetime #utilities #developer-tools

Basic information

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "euclid": {
      "url": "https://mcp.euclidtools.com"
    }
  }
}

Tools

No tools detected

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is Euclid?

Euclid is a hosted MCP server that gives AI agents access to deterministic computation engines for arithmetic, conversions, statistics, datetime, encoding, finance, color, regex, validation, and geographic calculations. It replaces LLM prediction with guaranteed, correct results.

How to use Euclid?

Connect any MCP client that supports HTTP transport to https://mcp.euclidtools.com. Authentication is handled automatically via OAuth 2.1, and your client will prompt you to sign in on first connection. Pre-built instruction files (CLAUDE.md, AGENTS.md, .cursorrules, .windsurfrules) can be copied into your project to instruct the AI to use Euclid’s tools instead of guessing.

Key features of Euclid

10 deterministic computation tools (calculate, convert, statistics, datetime, encode, finance, color, regex, validate, geo)
Near-zero latency: evaluates expressions in single-digit milliseconds
No sandbox or interpreter overhead required
Clear error messages with hints and examples on failure
Expression strings are minimal, reducing token cost versus code generation

Use cases of Euclid

Replace LLM arithmetic guessing with guaranteed correct mathematical computation
Perform unit conversions, date arithmetic, and financial formulas during conversation
Run statistical tests, encode/hash data, and validate structured inputs like emails or credit cards
Compute geographic distances, bearings, and polygon area for location-aware agents
Enforce deterministic computation everywhere — code, analytics, business metrics, and projections

FAQ from Euclid

Why not just use code execution for math?

Code execution spins up a sandbox or interpreter with hundreds of milliseconds of latency, writes verbose code, and risks syntax errors. Euclid evaluates a single expression string in single-digit milliseconds with clear error messages and lower token cost.

How do I enforce that the AI uses Euclid’s tools?

Copy the appropriate rule file from the rules/ directory into your project root or append it to your existing AI instruction file. The instruction tells the model to never guess numerical results and lists exactly which tool to use for each task.

What authentication does Euclid use?

Euclid uses OAuth 2.1. On first connection, your MCP client will prompt you to sign in automatically.

Which MCP clients are supported?

Any client that supports HTTP transport, including Claude Code, Claude Desktop, Cursor, Windsurf, and VS Code Copilot.

What are Euclid’s 10 tools?

calculate, convert, statistics, datetime, encode, finance, color, regex, validate, and geo. Each tool accepts structured arguments and returns deterministic results.