Expr-Lang

ivan-saorin/mcp-expr-lang

MCP Expr-Lang provides a seamless integration between Claude AI and the powerful expr-lang expression evaluation engine. This tool allows you to perform complex data manipulations, calculations, and transformations directly within your Claude conversations.

View on GitHub1

Install

npx -y @smithery/cli install @ivan-saorin/mcp-expr-lang --client claude

Client configuration

{
  "mcpServers": {
    "eval": {
      "command": "C:\\path\\to\\mcp-expr-lang\\bin\\server.exe"
    }
  }
}

GitHub stars: 1
Author: @ivan-saorin
Category: Research & Data, Developer Tools
License: MIT
Updated: Oct 6, 2026

About Expr-Lang

A powerful expression evaluation tool for Claude Desktop using the Model Context Protocol (MCP).

Features

Arithmetic operations: Addition, subtraction, multiplication, division, modulo, exponentiation
String operations: Concatenation, length, uppercase/lowercase conversion
Boolean operations: AND, OR, NOT, comparison operators
Array operations: Mapping, filtering, reducing, sorting
Object manipulation: Property access, transformation
Conditional logic: Ternary operators, if-else expressions
Built-in functions: Mathematical, string, array, and date functions

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

View all

Claude Desktop

Desktop · Freemium · Proprietary

Anthropic's official Claude AI desktop application. Supports MCP servers to extend functionality.

WindowsMacOS

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