It lets the agent perform calculations through a configured tool instead of approximating results or implementing calculator logic itself.

calculator — MCP server by qazi0/claude-plugins

calculator

calculator is an MCP server for Claude Code from qazi0/claude-plugins. Its token cost is not measured, scanned A, original, MIT.

A calculator service that runs as a separate process and provides calculation tools to the coding agent. MCP is a standard way for an agent to connect to external tools.

In plain words

What is it for?: Use it when the agent needs the calculator service configured by this add-on. The input does not provide further details about its supported operations.
Why use it?: It lets the agent perform calculations through a configured tool instead of approximating results or implementing calculator logic itself.

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: listed in a Claude config.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the calculator plugin — 1 skill, 2 commands, 1 MCP server shipped together

Good fit Use it when the agent needs the calculator service configured by this add-on. The input does not provide further details about its supported operations.

Compare 6 mcp servers from other repositories ↓

Installing this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add qazi0/claude-plugins

Claude Code

/plugin install calculator

Installing this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Made for: Claude Code.

Or install calculator, the plugin that ships this one along with the rest of its 1 skill, 2 commands, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/mcp/qazi0/claude-plugins/calculator/github.svg)](https://agentmods.dev/mcp/qazi0/claude-plugins/calculator)

Your own site

<a href="https://agentmods.dev/mcp/qazi0/claude-plugins/calculator"><img src="https://agentmods.dev/badge/mcp/qazi0/claude-plugins/calculator/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/mcp/qazi0/claude-plugins/calculator"><img src="https://agentmods.dev/badge/mcp/qazi0/claude-plugins/calculator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

calculator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

calculator/.mcp.json · 9 lines

What it actually says

{
  "calculator": {
    "type": "stdio",
    "command": "node",
    "args": [
      "${CLAUDE_PLUGIN_ROOT}/calculator-server.mjs"
    ]
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 9 lines scan A 686f9f23d63a

Subscribe to this mod's changes

calculator is an MCP server published in the GitHub repository qazi0/claude-plugins (10 stars, last pushed 7mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

calculator next to 6 mcp servers from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
calculatorqazi0/claude-plugins	MCP server	10	7mo ago	MIT	A	—	Claude Code
docs-langchainlangchain-ai/langchain	MCP server	149k	yesterday	MIT	A	—	Claude Code, Codex, Cursor, Gemini CLI, OpenCode
component-explorermicrosoft/vscode	MCP server	195k	yesterday	MIT	A	—	Claude Code, Codex, Cursor, Gemini CLI, OpenCode
codex_message_boardopenai/codex	MCP server	133k	yesterday	Apache-2.0	A	—	Claude Code, Codex, Cursor, Gemini CLI, OpenCode
playwright-testmicrosoft/playwright	MCP server	99k	yesterday	Apache-2.0	A	—	Claude Code, Codex, Cursor, Gemini CLI, OpenCode
reference-langchainlangchain-ai/langchain	MCP server	149k	yesterday	MIT	A	—	Claude Code, Codex, Cursor, Gemini CLI, OpenCode
reamorluto/rea	MCP server	435k	yesterday	MIT	A	—	Claude Code