MCP

ChatGPT

Last verified: 2026-07-21

Manyreach doesn't just look things up — it can do things (create campaigns, add prospects), and for that ChatGPT requires Developer mode. It's available on paid plans (Plus, Pro, Business, Enterprise, Edu) — not Free or Go. You add the connector in a browser or the ChatGPT desktop app (the mobile apps have no "add a connector" screen); once it's connected you can use Manyreach from the web, desktop, and mobile apps alike. OpenAI's rollout of Developer mode has varied by account.

Prerequisites

  • A Manyreach account + your API key (Manyreach web app → API & Integrations)
  • A ChatGPT account on a paid plan (Plus, Pro, Business, Enterprise, or Edu) — Free and Go plans don't get Developer mode or custom connectors. Set it up in a browser or the desktop app; the mobile apps can use the connector but can't add one
  • Business / Enterprise / Edu: an admin may need to turn on Developer mode for your workspace first (Workspace Settings → Permissions & Roles)

Steps

  1. Turn on Developer mode: go to Settings → Security and login and flip the toggle. (Some accounts show it under Settings → Apps & Connectors → Advanced instead.)
  2. Open Settings → Plugins, click Browse plugins, then the + next to the search bar. OpenAI keeps renaming this surface — accounts mid-rollout may still say Apps & Connectors (or just Apps / Connectors) with a Create / Add custom connector button; it's the same dialog either way. If there's no way to add anything, re-check that Developer mode is on.
  3. Paste the server URL: https://mcp.manyreach.com/mcp Some accounts also ask for a name (use "manyreach") and an optional description.
  4. Leave Authentication set to OAuth.
  5. Tick the acknowledgement for unreviewed servers — "I understand and want to continue, OpenAI hasn't reviewed this MCP server…" — and confirm.
  6. In a chat, click + near the message box → More (or Developer mode), and enable manyreach for that conversation — or simply @-mention it.

What the authorization looks like

Your browser opens a Manyreach authorization page. Paste your API key there and click Authorize. The key is checked once and never shown to the AI — afterwards the connection stays signed in on its own.

Verify

Ask ChatGPT to "describe the Manyreach catalog". It should call the describe tool and list resources like campaign, prospect, and sender.

Troubleshooting

  • Every write action (like starting a campaign) asks you to Approve or Deny — expected; ChatGPT shows the exact request first for anything that isn't read-only. Approvals can be remembered for the current conversation, but a new chat asks again.
  • "This tool call was blocked by OpenAI's safety checks" — retry it; as of mid-2026 this is still reported as an inconsistent false-positive (it can hit even read-only calls) rather than anything specific to the request.
  • "MCP server does not implement OAuth" when creating the connector — an intermittent discovery failure on ChatGPT's side; make sure the URL is exactly https://mcp.manyreach.com/mcp and Authentication is set to OAuth, then try again.
  • No "add a connector" option in the iOS/Android app — expected; the mobile apps can't create connectors. Add Manyreach once in a browser or the desktop app and it becomes available to use in the mobile apps automatically.
  • The connector is missing in a shared chat or a Project — custom connectors are scoped to your account and don't appear in shared conversations (and have been reported unreliable inside Projects); use a regular chat.
  • Developer mode toggle missing or greyed out on Business/Enterprise — ask your workspace admin to enable it under Workspace Settings → Permissions & Roles; if your plan should already include it, this has also been reported as a rollout bug worth a support ticket.