Calculator MCP Server

@cyanheads/calculator-mcp-server Evaluate, simplify, and differentiate mathematical expressions via MCP. STDIO or Streamable HTTP.

People who work with calculator, math and mathjs and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-24 · ★ 2 · #196 OF 998 MAINTAINED OTHER · VERIFIED 2026-09-30

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Calculator MCP Server

before you install - you'll need

Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL, MCP_HTTP_PORT before connecting.

Claude Code

claude mcp add cyanheads-calculator-mcp-server --transport http https://calculator.caseyjhand.com/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "cyanheads-calculator-mcp-server": {
      "url": "https://calculator.caseyjhand.com/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://calculator.caseyjhand.com/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-09-30

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to calculator.caseyjhand.com

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license Apache-2.0 - declared in the repository

npm package @cyanheads/calculator-mcp-server - published under the repo owner's npm scope (@cyanheads)

registry namespace io.github.cyanheads is GitHub-verified and matches the repo owner

03 · What Calculator MCP Server can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 1 documented tool, including calculate.

The 1 tools it gives your agent

Extracted from the project's README - what calculator-mcp-server lets an agent do.

calculate: - Evaluate math expressions, simplify algebraic expressions, or compute symbolic derivatives.

Latest releases

v0.5.0 · 2026-09-24

Typed calculate errors, exact Fraction mode, bounded results · New error reasons: operation_as_function for evaluate/simplify/derivative calls inside an expression, type_mismatch for operand type and unit errors, and…

v0.4.3 · 2026-09-19

mcp-ts-core 0.13.6 adoption and stateless session mode · MCP_SESSION_MODE now defaults to stateless in code, Docker, and src (#28) · A malformed calculate call carries data.reason: "invalid_arguments" and a Recovery…

v0.4.2 · 2026-09-13

Framework adoption and calculator configuration · Claude Code and Codex plugins expose the optional expression, timeout, and result limits; blank MCPB settings resolve to the documented defaults · Blank and whole-value…

04 · Who maintains Calculator MCP Server

calculator-mcp-server is maintained by cyanheads. We track 137 MCP servers from cyanheads - 131 actively maintained, 1,856 combined GitHub stars, oldest repo from Dec 2024. Full record: all servers from cyanheads.

05 · Facts

repository: github.com/cyanheads/calculator-mcp-server
category: other - ranked #196 of 998 actively-maintained other servers as of 2026-09-30.
release cadence: 5 releases in the last 90 days (latest 2026-09-24)
registry: io.github.cyanheads/calculator-mcp-server (active, first published 2026-03-30 · 33 versions)
packages: npm:@cyanheads/calculator-mcp-server · npm:@cyanheads/calculator-mcp-server

06 · Calculator MCP Server FAQ

What is Calculator MCP Server?

@cyanheads/calculator-mcp-server Evaluate, simplify, and differentiate mathematical expressions via MCP. STDIO or Streamable HTTP.

Is Calculator MCP Server still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-24 and it shipped 5 releases in the last 90 days. We re-verify nightly.

How do I install Calculator MCP Server?

Run `npx -y @cyanheads/calculator-mcp-server`. The README documents 3 environment variables (MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL, MCP_HTTP_PORT) to set first. Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL, MCP_HTTP_PORT before connecting. You can also paste the ready-made client config above.

Does Calculator MCP Server require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-30; you can connect without credentials.

07 · Alternatives to Calculator MCP Server

Alternatives to Calculator MCP Server

Maintained other servers if Calculator MCP Server isn't the fit.

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