> Add SupWriter to Claude as a custom connector in under a minute. Humanize, paraphrase, grammar-check, and detect AI without leaving the conversation.
- **Published**: 2026-05-26
- **Category**: Integrations
- **URL**: https://supwriter.com/blog/humanize-ai-text-in-claude-mcp

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# How to Humanize AI Text Inside Claude (MCP Setup)

If you write with Claude, you already know the friction: Claude produces a solid draft, and then you leave Claude to humanize it somewhere else. The SupWriter connector removes that step. Once it's added, Claude can humanize, paraphrase, grammar-check, and run AI detection right inside your conversation.

Here's how to set it up — it takes about a minute.

## The 60-second version

Open Claude → **Settings → Connectors → Add custom connector** → paste `https://supwriter.com/api/mcp` → connect → sign in with your SupWriter account → **Allow access**. Done. Skip to "Your first call" below.

## Step 1: Open Settings

Click your profile avatar in the bottom-left corner of Claude and choose **Settings**.

![Claude profile menu with Settings highlighted](/mcp/claude/step-1.png)

This works on Claude Pro, Max, Team, and Enterprise, and on the Claude desktop app.

## Step 2: Go to Connectors → Customize

In the Settings sidebar, open **Connectors**. Connectors now live under **Customize** — click that link to manage them.

![Claude Settings showing the Connectors tab and the Customize link](/mcp/claude/step-2.png)

## Step 3: Add a custom connector

On the Connectors page, click the **+** button in the top-right and choose **Add custom connector**.

![Claude Customize Connectors with the Add custom connector menu open](/mcp/claude/step-3.png)

## Step 4: Enter the SupWriter URL

Give the connector a name — "SupWriter" — and paste the remote MCP server URL, then click **Add**:

```
https://supwriter.com/api/mcp
```

That's the only field you need. Claude handles the OAuth registration automatically; you don't paste any client ID or secret.

![Add custom connector dialog with the SupWriter MCP URL filled in](/mcp/claude/step-4.png)

## Step 5: Connect and approve

Open the new **SupWriter** connector and click **Connect**. Claude opens a browser window to SupWriter — if you're already signed in you'll go straight to the consent screen; otherwise log in first.

The consent screen tells you exactly what Claude is asking for: permission to humanize, paraphrase, check grammar, and detect AI on your behalf. Click **Allow access**, and Claude links the connector to your account.

![SupWriter connector listed in Claude with the Connect button](/mcp/claude/step-5.png)

Once it connects, SupWriter shows up under your connectors with all four tools available:

![SupWriter connected in Claude with its four tools](/mcp/claude/connected.png)

## Your first call

Back in the conversation, just ask. A few that work well:

- *"Humanize this paragraph: …"*
- *"Draft a 150-word product description, then humanize it with a casual tone."*
- *"Run an AI-detection check on the text above and tell me which sentences are flagged."*

Claude will show you the tool call before it runs and the result right after. Everything stays in the thread.

## Troubleshooting

- **"Authorization expired" or you're asked to sign in again.** Access tokens are short-lived by design; Claude refreshes them automatically. If it asks you to reconnect, just approve again.
- **A tool returns `INSUFFICIENT_CREDITS`.** You're out of word credits for that request. The message shows how many you needed versus how many you have. Top up or upgrade your plan.
- **A tool returns `PLAN_LIMIT`.** Your text is over your plan's per-request word cap (500 on free/basic, 1,500 on Pro, 3,000 on Ultra). Split it into smaller chunks.
- **`LANGUAGE_NOT_AVAILABLE`.** The language you asked for needs a higher plan. English works on every plan.

## What you can do next

The same connector powers the [humanizer](/blog/humanize-ai-text-mcp-server), [grammar checker](/blog/grammar-checker-mcp-server), [paraphraser](/blog/paraphraser-mcp-server), and [AI detector](/blog/ai-detection-mcp-server). Using a different assistant too? We have setup guides for [ChatGPT](/blog/humanize-ai-text-in-chatgpt-mcp) and [Cursor, Claude Code & VS Code](/blog/humanize-ai-text-in-cursor-vscode-mcp).


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Source: https://supwriter.com/blog/humanize-ai-text-in-claude-mcp