Model Context Protocol

Your writing tools, inside every AI client

Add SupWriter as a custom connector and humanize, paraphrase, grammar-check, and detect AI text without leaving Claude, ChatGPT, or your editor. No copy-paste, no extra tabs.

Connect in 60 secondshttps://supwriter.com/api/mcp

Works in your AI client

One connector, every assistant. Pick yours for a step-by-step setup.

Claude

Humanize AI text inside Claude

ChatGPT

Humanize AI text inside ChatGPT

Cursor

Humanize AI text inside Cursor

Claude Code

Humanize AI text inside Claude Code

VS Code

Humanize AI text inside VS Code

Codex

Humanize AI text inside Codex

OpenCode

Humanize AI text inside OpenCode

+ other agentic tools & chat apps

Any client that speaks MCP works.

Four tools, one connector

Humanizer

Rewrite AI drafts so they read like a person wrote them — and pass detectors.

Grammar Checker

Fix grammar, then humanize — so corrected text never reads like a textbook.

Paraphraser

Rewrite while preserving meaning, with a humanization pass that survives detection.

AI Detection

Score text against 12 detectors with a sentence-level breakdown — in one call. Metered over MCP: 1 credit per word analyzed.

Two ways to connect

Most clients sign in with OAuth. Headless agents — and clients that take a token — connect with an API key instead. Either way, calls use your existing plan credits.

Recommended

Sign in with OAuth

For Claude, ChatGPT, Cursor, and any client with built-in connector support.

1
Open connector settings
In your AI client, open its Connectors or MCP settings and choose to add a custom connector.
2
Add the SupWriter URL
Paste https://supwriter.com/api/mcp as the remote MCP server URL.
3
Sign in and approve
Sign in with your SupWriter account and approve the consent screen.
4
Start writing
Ask your assistant to "humanize this" or "check this for AI" — the tools run in the conversation.

For tokens & agents

Connect with an API key

For headless agents, scripts, or clients that connect with an Authorization header. Requires a Pro or Ultra plan.

1
Create an API key
In SupWriter, open Settings → API & MCP → API keys and create a key. API access requires a Pro or Ultra plan.
2
Add the server with a header
Point your client at https://supwriter.com/api/mcp and send the key as an "Authorization: Bearer" header — no sign-in screen needed.
3
Start writing
The key inherits your plan credits. Rotate or revoke it any time from Settings → API & MCP.

Example client config

# Cursor / Claude Code — JSON, "mcpServers" key (~/.cursor/mcp.json)
{
  "mcpServers": {
    "supwriter": {
      "url": "https://supwriter.com/api/mcp",
      "headers": { "Authorization": "Bearer sw_live_your_key" }
    }
  }
}

# VS Code — JSON, "servers" key, type "http" (.vscode/mcp.json)
{
  "servers": {
    "supwriter": {
      "type": "http",
      "url": "https://supwriter.com/api/mcp",
      "headers": { "Authorization": "Bearer sw_live_your_key" }
    }
  }
}

# Codex — TOML (~/.codex/config.toml). Codex sends the env var's VALUE as the
# bearer token, so export SUPWRITER_TOKEN=sw_live_your_key first.
[mcp_servers.supwriter]
url = "https://supwriter.com/api/mcp"
bearer_token_env_var = "SUPWRITER_TOKEN"

# Claude Code — one command
claude mcp add --transport http supwriter https://supwriter.com/api/mcp \
  --header "Authorization: Bearer sw_live_your_key"

Create an API key

OAuth 2.1 sign-in Uses your existing credits Disconnect any time

Frequently asked

What is the SupWriter MCP server?

It's a remote Model Context Protocol server that lets AI assistants call SupWriter's humanizer, paraphraser, grammar checker, and AI detector as tools — inside your conversation, authenticated with your SupWriter account.

Which AI clients are supported?

Claude (web and desktop), ChatGPT, Cursor, Claude Code, VS Code, Codex, and OpenCode — plus any other agentic tool or chat app that supports remote MCP servers over OAuth or a bearer token.

Which plans include MCP?

Every plan — Free, Basic, Pro, and Ultra. Connect any supported AI client with your SupWriter sign-in (OAuth) and usage draws on your plan's word credits. Pro and Ultra additionally unlock the REST API and the static-token (headless) MCP option for agents and scripts.

Does it cost extra?

No separate MCP fee — calls draw on the word credits in your existing plan, one credit per word. Note that AI detection is metered over MCP (one credit per word analyzed), the same as the REST API; it's free only inside the SupWriter web app.

Can I connect without the sign-in screen?

Yes. Clients that take a token — or headless agents and scripts — can connect with a SupWriter API key sent as an Authorization: Bearer header instead of OAuth. Create one under Settings → API (Pro or Ultra plan). Both methods use the same MCP endpoint and your plan credits.

How is my account protected?

You connect through SupWriter's own OAuth sign-in and approve a consent screen listing exactly what the client can do. Access tokens are short-lived, and you can disconnect any time. API keys can be rotated or revoked instantly from Settings → API.

Bring SupWriter into your AI client

It takes about a minute. If you don't have an account yet, start free.

Start free See plans