# MCP Calculator Demo

> Use this tool when you need to perform basic arithmetic operations or demonstrate the Model Context Protocol. It solves problems related to simple calculations and provides a sample implementation for connecting custom tools to clients. The tool takes in arithmetic expressions as input and outputs the calculated results, making it suitable for testing and development contexts.

Canonical page: https://skillsregistry.net/skills/fisherskyi-mcp-demo  
JSON: https://api.skillsregistry.net/v1/skills/fisherskyi-mcp-demo

## Description

A sample MCP server that provides basic arithmetic tools like addition, subtraction, multiplication, and division. It serves as a demonstration for implementing the Model Context Protocol and connecting custom tools to clients like Claude Desktop.

## Trust

- **Trust score (0–1):** 0.99
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-19

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/i0jrr55b8j)
- **Repository:** <https://github.com/FisherSkyi/mcp-demo>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "fisherskyi-mcp-demo"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/fisherskyi-mcp-demo` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/fisherskyi-mcp-demo/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt