What does Calculator Mcp do?
It is an MCP server that exposes basic calculator operations (add, subtract, multiply, divide, modulo) for LLMs to invoke, intended as a testing or demonstration tool.
Calculator MCP Server
@wrtnlabs
Basic information
About Calculator MCP Server
Calculator MCP server on npx
Calculator MCP Server config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"calculator-mcp": {
"command": "npx",
"args": [
"@wrtnlabs/calculator-mcp@latest",
"--port",
"8931"
]
}
}
}Calculator MCP Server tools
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Overview
What is Calculator Mcp?
Calculator Mcp is a Model Context Protocol (MCP) server that provides browser automation capabilities using a basic calculator feature. It enables LLMs to interact with a calculator, and was created as a test program for connecting MCP features.
How to use Calculator Mcp?
Install and run using npx: npx @wrtnlabs/calculator-mcp@latest. Configure in MCP client settings with the command and args, or connect via SSE by specifying a port with --port and setting the client URL to http://localhost:<port>/sse. For VS Code, install via the CLI command code --add-mcp '{"name":"calculator","command":"npx","args":["-y", "@wrtnlabs/calculator-mcp@latest"]}'. Programmatic usage with custom transports is also supported using InMemoryTransport.
Key features of Calculator Mcp
- Provides arithmetic operations: add, sub, mul, div, mod.
- Runs as a standard MCP server via
npx. - Supports SSE transport with configurable port (
--port). - Works with VS Code and VS Code Insiders CLI.
- Includes programmatic API for custom transport integration.
- Lightweight test-oriented implementation for MCP connectivity.
Use cases of Calculator Mcp
- Testing MCP feature integration in custom applications.
- Toy projects requiring a simple calculator tool for LLMs.
- Demonstrating MCP server setup and configuration in VS Code.
- Experimenting with SSE transport between MCP clients and servers.
Frequently asked questions
How do I configure Calculator Mcp in an MCP client?
Add an entry to your `mcpServers` object with command `npx` and args `["-y", "@wrtnlabs/calculator-mcp@latest"]`. For SSE transport, use the `--port` flag and set the client URL to `http://localhost:<port>/sse`.
What runtime dependencies does Calculator Mcp have?
It requires Node.js to run via `npx`. No additional installation beyond Node.js is needed.
Does Calculator Mcp support authentication?
No authentication mechanism is mentioned in the README.
What transport options are available?
Standard stdio transport (via command-line invocation) and SSE transport (by passing `--port <port>`). Programmatic use with custom transports like `InMemoryTransport` is also supported.
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