RPN Calculator

MCP server that exposes an RPN calculator

PyPI Python Ruff

Install

pip install mcp-rpn

Usage

mcp-rpn

The server uses stdio transport for MCP protocol communication.

MCP Tools

evaluate

Evaluate an RPN (Reverse Polish Notation) expression.

{
  "name": "evaluate",
  "arguments": {
    "expression": "3 4 +",
    "show_stack": true
  }
}

Operators:

• + - Add
• - - Subtract
• - - Multiply
• / - Divide
• ** - Power
• % - Modulo

Commands:

• clear - Clear the stack
• dup - Duplicate top of stack
• swap - Swap top two elements

Examples:

• 3 4 + returns 7
• 10 5 2 + * 2 - returns 32
• 3 2 / returns 1.5

clear

Clear the calculator stack.

{
  "name": "clear",
  "arguments": {}
}

Development

git clone https://github.com/daedalus/mcp-rpn.git
cd mcp-rpn
pip install -e ".[test]"

# run tests
pytest

# format
ruff format src/ tests/

# lint
ruff check src/ tests/

# type check
mypy src/

MCP Registry

mcp-name: io.github.daedalus/mcp-rpn