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Connecting Pastel to ChatGPT and Codex

Add Pastel to ChatGPT so it can read your canvases and comments, reply to feedback and resolve it for you.

Written by Valentin Staykov

These instructions cover ChatGPT.com, the ChatGPT desktop app, and the Codex CLI. New to this? Start with Using the Pastel MCP server for an overview of what ChatGPT will be able to do once it's connected.

You'll need: a Pastel account, and Pastel's MCP server URL: https://api.usepastel.com/mcp

ChatGPT.com

  1. Go to Plugins, then click the plus icon.

  2. Name the server Pastel.

  3. Make sure the Server URL and OAuth options are selected.

  4. Enter the MCP server URL: https://api.usepastel.com/mcp

  5. Click I understand and want to continue, then click Create.

  6. Click Sign in with Pastel and complete the authorization flow.

ChatGPT Desktop

  1. Go to Settings → Plugins → MCPs, then click Add server.

  2. Name the server Pastel and select the Streamable HTTP type.

  3. Enter the MCP server URL: https://api.usepastel.com/mcp

  4. Click Save.

  5. Click Authenticate and complete the authorization flow.

Codex CLI

  1. Open your terminal.

  2. Run codex mcp add pastel --url https://api.usepastel.com/mcp

  3. Complete the authorization flow. If you weren't redirected automatically, run codex mcp login pastel

Check that it worked

Start a new conversation and ask:

List my Pastel canvases

If it comes back with your canvases, you're connected. If it says it doesn't have access to Pastel, start a fresh conversation, as agents usually only pick up new tools at the start of a chat.

Get the most out of it

Codex runs in your codebase, which is where this really pays off. Try pointing it at a comment and letting it take the whole thing:

Take comment #14 on the pricing page canvas. Work out what's causing it, fix it, reply on the comment explaining what you changed, and mark it resolved.

Pastel sends a canvas-specific investigation guide with every comment (which page to open, which element the comment is pinned to, where the screenshot is), so you don't need to explain any of that yourself.

You can also hand it a whole batch:

Go through the unresolved comments on the staging canvas, fix the ones that are clearly CSS issues, and leave the rest for me with a reply saying why.

Managing your connection

Every agent you've connected is listed in the MCP section of your Pastel profile settings, and can be disconnected there at any time.

ChatGPT only ever sees the canvases and comments that you can see, because it acts as you.

Something not working?

ChatGPT changes quickly and these steps can fall out of date. If a menu isn't where we've said it is, or the connection won't complete, let us know and we'll help you out.

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