MCP Servers

rpn-mcp

An MCP server that provides tools for evaluating Reverse Polish Notation (RPN) expressions and managing a calculator stack. It supports standard arithmetic operators along with stack operations like duplicate, swap, and clear.

README

mcp-rpn

MCP server that exposes an RPN calculator

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

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