MCP For Claude Marketplace
Deterministic Math Expression Evaluator

Deterministic Math Expression Evaluator MCP Connector for Claude

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Equip your AI with flawless algebraic parsing. Safely evaluate complex mathematical string expressions without using vulnerable `eval()` execution.

1 tools Official Updated Jun 28, 2026 Official Vinkius Partner
More Details Connect to Claude

When LLMs try to solve complex algebraic strings (e.g., (15 + 4) * 2 / sqrt(9)), they often guess the mathematical order of operations, leading to hallucinations. While one solution is to pass the string into Javascript's eval() function, this creates a massive security vulnerability for injection attacks. The Expression Evaluator MCP resolves this by implementing a pure, secure Recursive Descent Parser (AST) to evaluate mathematical strings deterministically.

The Superpowers

  • Order of Operations (PEMDAS): Impeccably resolves parentheses, exponents, multiplication, and addition in the exact mathematical order.
  • Zero-Vulnerability Execution: Employs a custom Lexer and AST (Abstract Syntax Tree) instead of eval(). Malicious code injections are physically impossible to execute.
  • Built-in Math Functions: Supports trig and algebraic functions right out of the box: sqrt, abs, sin, cos, tan, log, exp, round, ceil, floor.
  • Zero-Dependency Architecture: Pure JS runtime execution guarantees absolute speed without external bloated parsing packages.
algebraic-parsingmath-enginesecure-executionast-parsercode-safetycomputation

1 tools expose this connector's capabilities to your AI agent.

evaluate_math

Safely evaluates a string-based mathematical expression using a strict AST parser. Avoids LLM hallucinations on complex algebra

See how to talk to your AI agent using Deterministic Math Expression Evaluator.

Evaluate the formula: (15 + 5) * 2^3

Using the evaluate_math tool (expression='(15 + 5) * 2^3'): The exact computed result is 160.

Calculate the square root of 144 divided by 2.

Using the evaluate_math tool (expression='sqrt(144) / 2'): The exact computed result is 6.

Test a malicious payload: process.exit()

Using the evaluate_math tool: The engine correctly rejected the input as 'Invalid characters' because the AST parser does not execute code.

Using `eval()` exposes your agentic infrastructure to remote code execution (RCE) vulnerabilities. If a user prompts the AI to evaluate `process.exit()`, `eval()` will shut down your server. This MCP parses strings into an Abstract Syntax Tree (AST), making malicious execution impossible.

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