MCP connector: Claude and ChatGPT

Éclair’s MCP connector opens your site to Claude and ChatGPT, with the subscription you already have. Your AI reads your content, gets your editorial profile and Éclair’s SEO and GEO rules, writes drafts and prepares changes that you review. No API key, no cost for the site, and nothing is published or deleted without you.

What is the MCP connector?

MCP (Model Context Protocol) is the open standard that connects AI assistants to tools, described at modelcontextprotocol.io. Éclair’s MCP connector, added in version 1.4.0, turns your site into one of those tools: Claude and ChatGPT read it and prepare work on it, from their own app.

It complements the built-in AI assistant without replacing it:

For an overview of AI in Éclair, also read our page on AI in Éclair.

What do you need to use the MCP connector?

• A site that uses HTTPS: Claude and ChatGPT refuse any other URL.
• A compatible Claude or ChatGPT plan: see the table below.
• An administrator account, or an editor account if “Editors can use the assistant” is checked in Settings › AI assistant.
• Ideally, Éclair installed at the root of a domain or subdomain: some apps look for authorization at the root of the domain.

Which Claude and ChatGPT plans are compatible?

Plans checked on October 30, 2026:

Sources: Claude’s help on custom connectors, OpenAI’s help on custom MCP servers and OpenAI’s documentation. These plans change quickly: check in your app.

How do you turn on the MCP connector?

Allow three minutes, in three stages: Éclair, your AI, then your approval.

In Éclair

1. Check that your site opens properly over https://.
2. In Settings › AI assistant, scroll down to the Claude or ChatGPT with your subscription (MCP) section, at the bottom of the page, and turn on Allow MCP connections.
3. Click Save. The Connector URL appears, in the form https://your-site.com/_eclair/mcp: click Copy.

In Claude

On the web or in the desktop app:

1. Open Customize › Connectors, then Add › Add custom connector.
2. Give it a name, for example “My site”, paste the connector URL and click Continue.
3. Keep the detected authentication settings, then click Add.

On Team and Enterprise plans, an organization owner adds the connector; members then click Connect.

In ChatGPT

On the web:

1. Open Plugins › +, then Add custom MCP server.
2. Give it a name and paste the URL into the Connection field.
3. Choose OAuth authentication, accept the warning, then click Create as a plugin.

Your approval, on your site

1. A page on your site opens: “Connect Claude to your site” or “Connect ChatGPT to your site”. Log in if needed, two-factor authentication included.
2. Check the app and its return URL, claude.ai or chatgpt.com, shown below the list of permissions.
3. If you logged in more than 15 minutes ago, confirm your password. Then click Allow.

You’re all set. Ask, for example: “Look at my site and suggest 5 article ideas”, “Write a draft article about servicing an e-bike” or “Review my home page and suggest a more direct tagline”.

What can the AI do on your site?

It starts with get_site, then uses the built-in assistant’s tools, except image generation, which is paid for with the site’s key:

Each draft comes back with a link to open it in Éclair. Each suggestion comes back with a link that applies it in the editor without saving it, along with the list of changes: you review it, then save, or you close it and nothing changes. On top of that, Claude and ChatGPT ask for your approval before each write action, depending on their own settings.

The AI can’t publish, delete, or touch the settings and accounts. Publishing remains a human click, in Éclair.

Is the MCP connector secure?

• Off by default: as long as it’s off, none of its URLs respond.
• OAuth 2.1: PKCE required, automatic app registration without storing anything, return URL checked for an exact match, no open redirects.
• Your explicit approval, after you log in to your account (two-factor authentication included), on a page that never reveals your admin URL.
• One-hour tokens, renewed automatically and replaced at each renewal; if an old refresh token were ever reused, the connection would be cut. After 60 days without use, you have to give your approval again. Only token hashes are stored, and they’re excluded from backups.
• Access is revoked in one click: a Revoke access button for each app in Settings › AI assistant. Turning off the connector cuts off every app, and so does changing your password or clicking Log out my other devices in My profile.
• The same permissions as the built-in assistant, and at most 60 changes per hour per app, to prevent loops.
• Lightweight: the MCP server and authorization fit in under 25 KB of PHP, with no dependencies.

What goes to Anthropic or OpenAI: the content the AI reads to answer you, under the terms of your subscription. The site’s other protections are described in the Security guide.

What should you check if the connection fails?

Other issues? See the Troubleshooting guide or the connector section of Éclair’s official guide.