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Calculators MCP Server

by logiccommons Your server? Claim it
answering

Calculators is answering right now. Last checked 15 min ago. It exposes 3 tools.

Find and run trustworthy calculators with clear methods, provenance, and sources.

Uptime history 8 days of history
8 days agonow
100.0%
Uptime 24h
90 of 90 checks
3
Tools
read from the server
537 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Calculators every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

run in your terminal
claude mcp add calculators --transport http https://mcp.logiccommons.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "calculators": {
      "url": "https://mcp.logiccommons.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.calculators]
url = "https://mcp.logiccommons.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "calculators": {
      "url": "https://mcp.logiccommons.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "calculators": {
      "url": "https://mcp.logiccommons.com/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

calculator
get_calculator_schema
Get the input and output schema for a calculator, generated from its reviewed contract: parameter types, units, allowed dropdown values and definitional bounds, plus outputs keyed by named range (including the status output). Table inputs carry a 'grid' block giving the exact number of rows to send, the column layout, which columns are editable, and how to shape a row; a table whose 'grid' block says writable=false cannot be supplied at all. Schema 0.18 exposes required and omitted declarations plus version-bound visibility tables; older versions require every input while awaiting metadata migration. Optionally resolves one immutable platform version. Returns trust metadata for the resolved version.
run_calculator
Run a calculator with the given inputs. Inputs are validated against the resolved version's reviewed contract and computed by SpreadsheetWeb through the same proxy as the web channel. An optional platform_version pins both validation and computation to that immutable version. Returns outputs keyed by named range (including the status output) and trust metadata with a citation URL, resolvedInputs, and warnings for omitted inputs. Missing or blank visible required inputs are refused before computation; inspect get_calculator_schema and the complete error detail. For schema 0.18, optional omissions are sent explicitly as declared blank or standing default and disclosed with their values and sources. Older pinned contracts require all inputs during migration. Visibility follows version-bound dropdown truth tables; a missing controller makes its dependents indeterminate until it is supplied. A hidden controller is ignored only when all of its option branches have the same remaining visibility subtree; otherwise its dependents stay hidden. Hidden omissions use explicit blank/default values; supplied hidden inputs are retained with a not-applicable warning. Always read Model_Status and status outputs; CHECK and STOP are load-bearing verdicts about the result's validity. Results are informational and not professional advice; the applicable notice is returned in the trust block.
calculators
search_calculators
Search the LogicCommons calculator catalog by keyword and optional category. Returns matching published calculators with slug, name, summary, category, a citation URL, and trust metadata.

Endpoints

URLTransportStateLatencyChecked
https://mcp.logiccommons.com/mcp streamable-http answering 552 ms 15 min ago

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Calculators — questions

Answers built from our own checks of this server.

What can Calculators do?
It exposes 3 tools, read directly from the server on our last check. Among them: get_calculator_schema, run_calculator, search_calculators. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Calculators working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 90 of 90 checks got a reply (100.0%), average response time 537 ms. The bar chart above shows every period we have measured.
How do I connect Calculators?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Calculators need an API key?
No. Calculators completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Calculators?
It answers our handshake in 537 ms on average, which is faster than 28% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.