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com.mcpcalc/calculator

by mcpcalc.com · remote · no sign-in to list tools · v1.1.0 · published by com.mcpcalc

Calculators accessible via MCP with real-time collaborative sessions and shareable URLs.

Changes · 7
CompareRegistry entry

10 tools: 7 change things and 3 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http calculator https://mcpcalc.com/api/v1/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Changes things 7Claude Code: ask
  • calculateRun a calculation and get results + prefilled URLNo findings

    Why it is in this group

    • The description's first verb is "run": a word for a change.
    Description, as the server wrote it
    Run a calculation and get results + prefilled URL
  • calculate_casEvaluate one or more headless CAS expressions server-side (MCP-only numeric mode).No findings

    Why it is in this group

    • The description's first verb is "evaluate": a word for a change.
    Description, as the server wrote it
    Evaluate one or more headless CAS expressions server-side (MCP-only numeric mode). Unsupported expressions return a GUI handoff link.
  • calculate_cas_headlessAlias of calculate_cas.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Alias of calculate_cas. Headless MCP-only CAS evaluator; if unsupported features are requested, returns GUI handoff details.
  • close_sessionClose a session and optionally persist a snapshot of its final stateNo findings

    Why it is in this group

    • The name "close_session" says "close": a word for a change.
    Description, as the server wrote it
    Close a session and optionally persist a snapshot of its final state
  • create_sessionCreate a new interactive session for any calculator and return the session URLNo findings

    Why it is in this group

    • The name "create_session" says "create": a word for a change.
    Description, as the server wrote it
    Create a new interactive session for any calculator and return the session URL
  • generate_prefilled_urlGenerate a prefilled URL without running calculationNo findings

    Why it is in this group

    • The name "generate_prefilled_url" says "generate": a word for a change.
    Description, as the server wrote it
    Generate a prefilled URL without running calculation
  • push_session_actionPush actions into a session's message queue (set fields, submit computation, trigger plot, etc.)No findings

    Why it is in this group

    • The name "push_session_action" says "push": a word for a change.
    Description, as the server wrote it
    Push actions into a session's message queue (set fields, submit computation, trigger plot, etc.)
Only reads 3Claude Code: allow
  • get_calculator_schemaGet the input schema for a specific calculatorNo findings

    Why it is in this group

    • The name "get_calculator_schema" says "get": a word for reading.
    Description, as the server wrote it
    Get the input schema for a specific calculator
  • get_session_stateRetrieve the current field values, computation transcript, and pending message queue for an active sessionNo findings

    Why it is in this group

    • The name "get_session_state" says "get": a word for reading.
    Description, as the server wrote it
    Retrieve the current field values, computation transcript, and pending message queue for an active session
  • list_calculatorsList available calculators, optionally filtered by categoryNo findings

    Why it is in this group

    • The name "list_calculators" says "list": a word for reading.
    Description, as the server wrote it
    List available calculators, optionally filtered by category

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http calculator https://mcpcalc.com/api/v1/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__calculator__list_calculators",
      "mcp__calculator__get_calculator_schema",
      "mcp__calculator__get_session_state"
    ],
    "ask": [
      "mcp__calculator__calculate",
      "mcp__calculator__generate_prefilled_url",
      "mcp__calculator__calculate_cas",
      "mcp__calculator__calculate_cas_headless",
      "mcp__calculator__create_session",
      "mcp__calculator__push_session_action",
      "mcp__calculator__close_session"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as calculator. Review it before you use it.