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Rpn MCP server

by daedalus·io.github.daedalus/mcp-rpn·v0.1.1
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MCP server that exposes an RPN calculator

B82/100grade B
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Safety scan
B82/100

full report

Adoption
New

0 stars16 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Rpn tools (2)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • clear

    Clear the RPN calculator stack.

  • evaluate

    Evaluate an RPN (Reverse Polish Notation) expression.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan4 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 158 days ago8/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Rpn compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
82/100
higher than 63% of 48,273 servers
Tools
2
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
16
more than 4% of 11,915 servers with a package

What its tools let an agent do: 1 read · 1 run or deploy

Install Rpn in Claude Code, Cursor or VS Code

claude mcp add mcp-rpn -- uvx mcp-rpn
Add to Cursor

What the publisher says

From the Rpn repository's README, as published. We do not edit it. Read it on GitHub

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

Nothing above is checked by us. What we check is on the safety report.

Rpn: common questions

Is Rpn MCP server safe?
Mostly: it is graded B (82/100). Read the Rpn safety report
How do I install Rpn?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Rpn need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Rpn maintained?
The last commit was 194 days ago (2026-04-22). The latest release is v0.1.1.
How does Rpn compare with other MCP servers?
safety score 82/100 (higher than 63% of 48,273 servers); tools 2 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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