PlainGrade

dev.workers.mike-tusa.plaingrade-apiPublished by plaingrade-api.mike-tusa.workers.devOfficial publisherv0.5.1Updated Nov 1, 2026

English readability scores (Flesch, Flesch-Kincaid, Fog, SMOG) and text stats. Text never stored.

VerifiedStreamable HTTPWeb executableData & Analytics

Overview

AI-generated overview

PlainGrade is a remote MCP server that scores the readability of English text and returns grade levels, text statistics and long sentences.

What you can do
  • Score English text for readability: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI and a consensus grade
  • Get a plain-English interpretation of the resulting grade level
  • Retrieve text statistics such as word, sentence and syllable counts plus reading and speaking time
  • List the sentences that exceed a length threshold
When to use it
Useful when an assistant writes or edits English prose and you want an objective check on how hard it is to read, or when auditing documents, help text or marketing copy for grade level.
Requirements
A remote streamable HTTP endpoint; no local install. Text must be English and at most 20,480 bytes UTF-8. Works without a key at roughly 10 calls/min and 50/day per IP; an optional free key (sent as an Authorization Bearer token or X-Api-Key header) raises limits to 100/day and 30/min, and a paid Pro license key is available.
Before you install
The optional Authorization header carries an API key or paid Pro license key, so treat it as a secret. The Pro tier costs $5/month. Text is sent to a third-party service, though it is described as scored in memory and never stored or logged. Rate limits apply without a key.

Installation

In SourceWeft

  1. Open PlainGrade in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/dev.workers.mike-tusa.plaingrade-api%2Fplaingrade-api/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "plaingrade": {
      "type": "http",
      "url": "https://plaingrade-api.mike-tusa.workers.dev/mcp"
    }
  }
}

Tools

1

score_readability

Score English text readability (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI)

Compute readability scores for English text: Flesch Reading Ease, Flesch-Kincaid grade, Gunning Fog, SMOG, Coleman-Liau, ARI and a consensus grade, with plain-English interpretation, text statistics (words, sentences, syllables, reading and speaking time) and the sentences longer than a threshold. Read-only; the text is scored in memory and never stored or logged. Same engine as the PlainGrade JSON API (POST /v1/score).

Parameterslangtextrequiredinclude_rawlong_sentence_words

Version history

3
  1. v0.5.1LatestNov 1, 2026
  2. v0.4.0Oct 16, 2026
  3. v0.3.1Oct 12, 2026

Score

72% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts

    Publish an icon in the registry entry.

  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.