# Calculator MCP Server

> Calculator MCP Server — doudou-fly-open-mcp. Use this tool when you need to perform basic arithmetic operations, such as adding, subtracting, multiplying, or dividing numbers, and want to interact with it using natural language inputs. It solves mathematical problems and provides precise calculations as outputs, enabling AI clients to make informed decisions. Ideal for use cases requiring simple mathematical computations, it accepts natural language queries and returns numerical results.

Canonical page: https://skillsregistry.net/skills/doudou-fly-open-mcp  
JSON: https://api.skillsregistry.net/v1/skills/doudou-fly-open-mcp

## Description

Provides basic arithmetic operations (add, subtract, multiply, divide) through MCP, enabling AI clients to perform calculations via natural language.

## Trust

- **Trust score (0–1):** 0.69
- **Verification tier:** scanned
- **Last scanned:** 2026-09-03

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-03

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/svdwr1fh1h)
- **Repository:** <https://github.com/doudou-fly/open-mcp>

## 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": "doudou-fly-open-mcp"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/doudou-fly-open-mcp` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/doudou-fly-open-mcp/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