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Connect ChatGPT to SignWith (MCP)

Add SignWith to ChatGPT as an app, and ChatGPT can send documents for signature, follow signers and verify signed PDFs while you chat.

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Updated

ChatGPT connects to remote MCP servers as apps you create in developer mode. Steps checked against OpenAI's documentation on 1 October 2026; ChatGPT's labels change often, so look for the closest match if a name differs.

ChatGPT signs in to SignWith with OAuth, so you never paste an API key: you approve the connection on SignWith's own sign-in page.

Before you start

  • Developer mode is available on ChatGPT Plus, Pro, Business, Enterprise and Education, on the web.
  • On a Business, Enterprise or Education workspace, an admin may need to allow developer mode first.

Add SignWith

  1. In ChatGPT, open Settings → Security and login and turn on Developer mode.
  2. Go to Plugins and select the + button to create an app.
  3. Name it SignWith, enter https://app.signwith.co/mcp as the MCP server URL, and choose OAuth for authentication.
  4. Create the app. ChatGPT sends you to SignWith: sign in, and choose Full access or View only.

The new app appears under Drafts in your app settings, where you can see its tools and turn individual tools off.

Use it in a chat

Apps in developer mode aren't on in every chat automatically. In the message box, open the + menu, choose Developer mode, and select SignWith. Then ask, for example:

  • "Show my SignWith templates."
  • "Send the lease template to Grace Hopper, [email protected], as the tenant."
  • "Which signature requests are still open?"

ChatGPT asks you to confirm before it runs a tool that changes something, such as sending a document.

Credits in ChatGPT

Inside ChatGPT, SignWith doesn't offer its credit-purchase tools. If the account runs out of credits, ChatGPT tells you to add credits in SignWith, then you can ask it to try again. See credits and billing.

Troubleshooting

  • Sign-in fails: check you're signing in to the SignWith account you use for documents, then create the app again.
  • ChatGPT can read but not send: you chose View only. Remove the app's connection and connect again with Full access.
  • Disconnect: remove the app in ChatGPT's app settings.

All tools and access rules are on the MCP overview.

Start building

The API and MCP server come with every account. 3 free documents a month, then pay per document.

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