Is Mcp_calculator safe to use?

Mcp_calculator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Mcp_calculator?

Mcp_calculator can be installed by cloning its GitHub repository and following the setup instructions in the README.

What AI clients work with Mcp_calculator?

Mcp_calculator is compatible with claude-desktop, cursor, claude-code. It uses http transport.

Is Mcp_calculator actively maintained?

Mcp_calculator is not actively maintained — last commit was 403 days ago.

Mcp_calculator

Name: Mcp_calculator
Author: KeerthiNingegowda

by KeerthiNingegowda

A simple calculator app with MCP compliant server and client

GitHub

No known CVEs

MIT license

Stale

Last commit 403d ago

Works with most clients

Transport: http

0 tools

Grade F

Edit this pageView history

Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktophttp · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcp-calculator": {
      "command": "<see-readme>",
      "args": []
    }
  }
}

Are you the author?

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Read me

What Mcp_calculator does

To explore basic building blocks of MCP and intricacies of tool calling within MCP, from scratch. Keeping it as simple as possible without handling many edge cases. Understand how to build both MCP Server and clients.

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

21/100across 5 weighted dimensions

How we score →

0255075100

−79

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcp_calculator safe to use?: Mcp_calculator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Mcp_calculator?: Mcp_calculator can be installed by cloning its GitHub repository and following the setup instructions in the README.
What AI clients work with Mcp_calculator?: Mcp_calculator is compatible with claude-desktop, cursor, claude-code. It uses http transport.
Is Mcp_calculator actively maintained?: Mcp_calculator is not actively maintained — last commit was 403 days ago.

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MCP Security Weekly

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Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktophttp · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcp-calculator": {
      "command": "<see-readme>",
      "args": []
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/mcp-calculator)](https://mcppedia.org/s/mcp-calculator)

Read me

What Mcp_calculator does

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

README

A simple calculator app using Model Context protocol

Purpose of this repo

Core Features

A calculator app to do add, subtract, multiply, divide and modulo

Debugging server using MCP Inspector

A MCP-based client that takes a query from the user to perform the above mentioned operations

Future possibilities for quick concept exploration

Sequential tool calling

Storage of previous chat history is not supported to maintain simplicity

Input validation by server and/or client

🚨 Most of the technolgies used in this repo like FastMCP, tool calling in anthropic and MCP itself are very recent. So there are some features in these technologies that are either not available or buggy. But the main goal is a simple exploration without using cursor or Claude Desktop 🚨

MCP compliant Calculator Server

Is built using FastMCP, due to its simplicty and automatic error handling. Points to remember:-

Always name the server either as mcp or server or app. Throws an error otherwise and is quite explicit

Annotations can be included as a future reference. Right now it is not supported in FastMCP for the version in uv.lock

MCP client

Makes a connection to MCP server and should have access to LLM Would higly suggest to explore and inspect the objects returned when the model uses a tool and a genertic reponse Try to stress test giving numbers in different format. Eg:- Add 2 and 3 v/s Add two and three. Eg:- Try to use ambiguous and large numbers:- Add seven hundred thousand trillion with three hundred billion

Workflow overview

To reproduce the working environment whre .toml file is located

uv sync

TO activate the working environment use

source .venv/bin/activate

To simply inspect the server

Go to fastmcp_calculator_server folder and run
mcp dev server.py

Add your anthropic API key to .env file

To run the whole MCP app

Go to mcp_calculator/mcp_compliant_client and run
python client.py <path to server.py>

More about this on medium.

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

21/100across 5 weighted dimensions

How we score →

0255075100

−79

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcp_calculator safe to use?: Mcp_calculator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Mcp_calculator?: Mcp_calculator can be installed by cloning its GitHub repository and following the setup instructions in the README.
What AI clients work with Mcp_calculator?: Mcp_calculator is compatible with claude-desktop, cursor, claude-code. It uses http transport.
Is Mcp_calculator actively maintained?: Mcp_calculator is not actively maintained — last commit was 403 days ago.