Rephrasy

Rephrasy MCP Server

Use Rephrasy from Claude, Cursor, or any MCP client: humanize AI-generated text and images, and check AI-detection scores, without leaving your editor or agent workflow.

Four tools, one API key:

Setup

1. Get an API key — sign in at rephrasy.ai → Account → API. Both tools bill against your Rephrasy plan.

2. Add the server to your client:

Claude Code

claude mcp add rephrasy -e REPHRASY_API_KEY=<your-key> -- npx -y @rephrasy/mcp

Claude Desktop

Add to claude_desktop_config.json (Settings → Developer → Edit Config):

{
  "mcpServers": {
    "rephrasy": {
      "command": "npx",
      "args": ["-y", "@rephrasy/mcp"],
      "env": { "REPHRASY_API_KEY": "<your-key>" }
    }
  }
}

Cursor

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "rephrasy": {
      "command": "npx",
      "args": ["-y", "@rephrasy/mcp"],
      "env": { "REPHRASY_API_KEY": "<your-key>" }
    }
  }
}

Until the package is on npm you can run it straight from GitHub: replace "args": ["-y", "@rephrasy/mcp"] with "args": ["-y", "github:rephrasyai/rephrasy-mcp"].

Hosted server (no install)

Rephrasy also runs a hosted MCP server, so clients that speak streamable HTTP need nothing installed locally:

claude mcp add rephrasy https://v2-humanizer.rephrasy.ai/mcp -t http \
  -H "Authorization: Bearer <your-key>"

It supports OAuth as well — ChatGPT and other clients that require it discover it from the server and send you through a one-time consent page, so the key never reaches the client. The hosted server carries a wider tool set (engine recommendations, readability, bring-your-own-key detectors). Full docs: https://rephrasy.ai/mcp.

Tools

humanize

Returns the rewritten text plus the number of words charged.

Models

v3 and Undetectable Model v2 are retired. Old calls keep working: the API routes v3 to superstealth and v2 to v4. The v3-only style parameter is gone.

detect

Returns JSON with scores.overall (lower = more human-like) and, in per-sentence mode, sentences.

humanize_image

A diffusion pass removes invisible AI watermarks such as SynthID while subject, composition and resolution stay the same. Costs 10 credits on standard and 20 on hq; a failed image is refunded. Standard images are usually saved within the call. If a job is still running, the tool returns a job_id instead.

get_image_result

Waits up to about 50 seconds per call and saves the image once it is done. Results stay available for 72 hours and also show up in your image history on rephrasy.ai.

Example prompts

• "Humanize this paragraph, then run detect on the result to verify it."
• "Humanize this essay with superstealth so it passes Pangram."
• "Rewrite my draft with the humanize tool using model <style-id> (my writing style)."
• "Check which sentences of this post read as AI-written."
• "Humanize ~/Desktop/hero.png in hq and tell me where you saved it."

Development

npm install
npm run build
REPHRASY_API_KEY=<key> node dist/index.js   # runs on stdio

License

MIT © Rephrasy