Calculator Mcp Server
by cyanheadscommunityv0.4.0
1
This MCP server provides a calculator that allows any LLM to verify mathematical computations, including evaluating, simplifying, and differentiating expressions.
From the registry: Evaluate, simplify, and differentiate mathematical expressions.
Install & configure
Prerequisites
- required
Install in your client
Paste into the AI you're chatting with — it will figure out the rest
Please install the `calculator-mcp-server` MCP server into my current AI client (that's you).
Required prerequisites (do these first if not already done):
- **Install Bun** — Bun v1.2.0 or higher is required (https://bun.sh/)
Canonical MCP server config (stdio transport):
- command: `bunx`
- args: ["@cyanheads/calculator-mcp-server@latest"]
- optional environment variables:
- `CALC_MAX_EXPRESSION_LENGTH`: Maximum allowed expression string length (10-10,000) (example: `1000`)
- `CALC_EVALUATION_TIMEOUT_MS`: Maximum evaluation time in milliseconds (100-30,000) (example: `5000`)
- `CALC_MAX_RESULT_LENGTH`: Maximum result string length in characters (example: `100000`)
- `MCP_TRANSPORT_TYPE`: Transport: stdio or http (example: `stdio`)
- `MCP_HTTP_PORT`: Port for HTTP server (example: `3010`)
- `MCP_AUTH_MODE`: Auth mode: none, jwt, or oauth (example: `none`)
- `MCP_LOG_LEVEL`: Log level (RFC 5424) (example: `info`)
Note: A public hosted instance is also available at https://calculator.caseyjhand.com/mcp (streamable-http).
Add this MCP server to my current client's config in the correct format for you. If you need secrets or credentials I haven't provided, ASK me — do not invent values or leave raw placeholders. After adding it, tell me how to verify the server is connected.Note: A public hosted instance is also available at https://calculator.caseyjhand.com/mcp (streamable-http).
Tools (1)
calculate
Evaluate math expressions, simplify algebraic expressions, or compute symbolic derivatives.
Environment variables
CALC_MAX_EXPRESSION_LENGTHrequiredMaximum allowed expression string length (10–10,000).CALC_EVALUATION_TIMEOUT_MSrequiredMaximum evaluation time in milliseconds (100–30,000).CALC_MAX_RESULT_LENGTHrequiredMaximum result string length in characters (1,000–1,000,000).MCP_TRANSPORT_TYPErequiredTransport: stdio or http.MCP_HTTP_PORTrequiredPort for HTTP server.MCP_AUTH_MODErequiredAuth mode: none, jwt, or oauth.MCP_LOG_LEVELrequiredLog level (RFC 5424).Packages
@cyanheads/calculator-mcp-server
npmv0.4.0transport: stdio
@cyanheads/calculator-mcp-server
npmv0.4.0transport: streamable-http
Remote Endpoints
https://calculator.caseyjhand.com/mcp
type: streamable-http
Details
- Language
- TypeScript
- License
- Apache-2.0
- Released
- Jul 2, 2026
- Last commit
- Jun 20, 2026
- Registry name
- io.github.cyanheads/calculator-mcp-server
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