Readability Calculator

Education REST API MCP

Compute six readability scores for English text (Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, Automated Readability Index) plus an average grade level, a reading-level label, a target audience, and text statistics. Scores are null when the text has fewer than 10 words.

This page documents the MCP tool findutils:readability_calculator. See the REST reference →

Use in the browser View as Markdown

Call it over MCP

Tool name findutils:readability_calculator · no API keys · 120 requests/min per IP

Claude Code

claude mcp add findutils --transport http https://mcp.findutils.com/

Claude Desktop — claude_desktop_config.json

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}

Raw JSON-RPC (any MCP client) — verified example

curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "readability_calculator",
      "arguments": {
        "text": "The cat sat on the mat. The dog sat on the rug. Both were happy."
      }
    }
  }'

Input schema

Argument	Type	Required	Description
text	string	yes	The text to analyse (at least 10 words for scores).

Example arguments (verified)

{
  "text": "The cat sat on the mat. The dog sat on the rug. Both were happy."
}

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/readability-calculator/execute — no key, 60 requests/min.

Open the REST reference for Readability Calculator →

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