@islobodan
基本情報
Cruncher MCP: The Scientific Calculator MCP Server
以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。
{
"mcpServers": {
"cruncher": {
"command": "npx",
"args": [
"-y",
"@slbdn/cruncher-mcp"
],
"env": {
"CRUNCHER_TOOL_SET": "standard",
"CRUNCHER_TIMEOUT": "5000"
}
}
}
}Adds two numbers.
Subtracts two numbers.
Multiplies two numbers.
Divides two numbers. Errors on zero divisor.
Raises a to the power of b.
Square root. Errors on negative input.
Sine. Angle in degrees by default, or radians with unit: "radians".
Cosine. Angle in degrees by default, or radians with unit: "radians".
Tangent. Angle in degrees by default, or radians with unit: "radians".
Arcsine. Result in degrees by default, or radians with unit param.
Arccosine. Result in degrees by default, or radians with unit param.
Arctangent. Result in degrees by default, or radians with unit param.
Base-10 logarithm. Errors on non-positive input.
Natural logarithm (ln). Errors on non-positive input.
Absolute value.
Returns a mathematical, physical, or chemical constant. See enum values.
Sum of numbers.
Average (mean) of numbers.
Median of numbers.
Minimum of numbers.
Maximum of numbers.
Count elements.
Range (max - min) of numbers.
Sample variance (n-1). Set population: true for population variance (n).
Sample standard deviation (n-1). Set population: true for population (n).
What is X% of Y? e.g., 15% of 200 = 30
Percentage change from A to B. e.g., 50→80 = +60%
X is Y% of what? e.g., 30 is 15% of 200
Remainder of a / b. Errors on zero divisor.
Factorial of non-negative integer (n!). n > 170 overflows.
Evaluate a mathematical expression. PRIMARY tool for ALL math: +, -, *, /, %, ^. Functions: sqrt, sin, cos, tan, asin, acos, atan, log10, ln, log(x,base), abs, round, floor, ceil, min, max. Constants: pi, e, tau, phi, sqrt2, euler_mascheroni, c, g, G, h, k, R, NA, e_charge, m_e, m_p. Parentheses and scientific notation (1e6) supported. Use explicit operators: 2 * pi, not 2pi.
Convert between common units. Categories: length, weight, temperature, area, volume, time, speed, digital_storage.
Set global trig angle mode. Individual calls with unit param override this.
Get current trig angle mode.
Cruncher Mcp is a powerful scientific calculator built as a Model Context Protocol (MCP) server that gives AI assistants the ability to perform complex mathematical calculations, run statistical analyses, manage memory, and access scientific constants. It is designed with zero external dependencies, relying solely on native Node.js capabilities, and works with any MCP-compatible client such as Claude Desktop, Cursor IDE, OpenWebUI, and others.
Install and run the server via npx @slbdn/cruncher-mcp, then configure your MCP client (e.g., Claude Desktop) to connect to it by adding a new “cruncher” server with the command npx and arguments -y @slbdn/cruncher-mcp. Alternatively, download cruncher.js from GitHub and configure the client with a node command pointing to the file. The tool tier can be set via the environment variable CRUNCHER_TOOL_SET (minimal, standard, or full), and the calculation timeout can be adjusted with CRUNCHER_TIMEOUT (milliseconds, default 3000).
MCP is an open standard that allows AI applications to securely connect with external data sources and tools—a universal API for AI. Cruncher implements this protocol so any MCP‑capable AI can use it without custom integration.
No. Cruncher is built with zero dependencies, relying purely on Node.js standard libraries. It uses `new Function()` with a strict regex whitelist for expression evaluation, not `eval()` or libraries like `mathjs`.
Node.js version 18.0.0 or newer is required. The server supports two environment variables: `CRUNCHER_TOOL_SET` (values: minimal, standard, full) and `CRUNCHER_TIMEOUT` (timeout in milliseconds, default 3000).
It spawns calculations in a Node.js `worker_thread` and terminates the worker if it exceeds a configurable timeout (default 3 seconds), keeping the main server responsive.
Cruncher communicates over `stdio` using JSON‑RPC messages (initialize, tools/list, tools/call). The README does not mention any authentication mechanism or network transport.
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