io.github.cyanheads/calculator-mcp-server MCP Server

io.github.cyanheads/calculator-mcp-server

Repository Registry

What is the io.github.cyanheads/calculator-mcp-server MCP server?

Evaluate, simplify, and differentiate mathematical expressions.

How to install io.github.cyanheads/calculator-mcp-server

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

CALC_MAX_EXPRESSION_LENGTH
Maximum allowed expression string length.
CALC_EVALUATION_TIMEOUT_MS
Maximum evaluation time in milliseconds.
CALC_MAX_RESULT_LENGTH
Maximum result string length in characters.
MCP_LOG_LEVEL
Sets the minimum log level for output (e.g., 'debug', 'info', 'warning').
MCP_HTTP_HOST
The hostname for the HTTP server.
MCP_HTTP_PORT
The port to run the HTTP server on.
MCP_HTTP_ENDPOINT_PATH
The endpoint path for the MCP server.
MCP_AUTH_MODE
Authentication mode to use: 'none', 'jwt', or 'oauth'.

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

{
  "mcpServers": {
    "calculator-mcp-server": {
      "command": "bun",
      "args": [
        "-y",
        "@cyanheads/calculator-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "CALC_MAX_EXPRESSION_LENGTH": "<YOUR_CALC_MAX_EXPRESSION_LENGTH>",
        "CALC_EVALUATION_TIMEOUT_MS": "<YOUR_CALC_EVALUATION_TIMEOUT_MS>",
        "CALC_MAX_RESULT_LENGTH": "<YOUR_CALC_MAX_RESULT_LENGTH>",
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "MCP_HTTP_HOST": "<YOUR_MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<YOUR_MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<YOUR_MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<YOUR_MCP_AUTH_MODE>"
      }
    }
  }
}

Related MCP servers

io.github.cyanheads/cdc-health-mcp-server

Active

Search and query CDC public health data — mortality, vaccinations, surveillance, behavioral risk.

TypeScript

Apache-2.0

View repository →

io.github.cyanheads/census-mcp-server

Active

Query U.S. Census Bureau data, variables, and geography via MCP.

TypeScript

Apache-2.0

View repository →

io.github.cyanheads/chembl-mcp-server

Active

Link compounds to protein targets, rank bioactivity, and look up drug mechanisms and indications.

TypeScript

Apache-2.0

View repository →

io.github.cyanheads/cisa-cybersecurity-mcp-server

CISA KEV with BOD 26-04 deadlines, SSVC prioritization, and the ICS advisory corpus (CSAF). Keyless.

View repository →

io.github.cyanheads/clinicaltrialsgov-mcp-server

Active

Search ClinicalTrials.gov, retrieve study details and results, and match patients to eligible trials.

TypeScript

Apache-2.0

View repository →

io.github.cyanheads/clipboard-mcp-server

Active

Read, write, and inspect the system clipboard on macOS, Linux (X11/Wayland), and Windows via MCP.

TypeScript

Apache-2.0

View repository →