io.github.daedalus/mcp-rpn
MCP server that exposes an RPN calculator
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 stackdup- Duplicate top of stackswap- Swap top two elements
Examples:
3 4 +returns710 5 2 + * 2 -returns323 2 /returns1.5
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
Installation
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
uvx mcp-rpnSet up in your AI client
Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-daedalus-mcp-rpn": {
"command": "uvx",
"args": [
"mcp-rpn"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referencePackage
mcp-rpnpypiCompatible MCP Clients
io.github.daedalus/mcp-rpn works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
- Claude Desktop
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect. - Cursor
~/.cursor/mcp.jsonRestart Cursor for changes to take effect. - VS Code
.vscode/mcp.jsonReload VS Code window for changes to take effect. - Windsurf
~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect. - Claude Code
.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.