ChatGPT

Connect ChatGPT to your workspace through MCP so it can answer questions about your work, draft reports, surface blockers, and help plan. To send implementation work to Codex instead, see the Codex integration.

Connect ChatGPT

1. 1

   Enable Developer Mode

   1. Open ChatGPT Settings in your browser.
   2. Go to Apps → Advanced Settings.
   3. Turn on Developer Mode.

   

   Developer Mode is currently only available in the browser version of ChatGPT, not in the mobile or desktop apps.

2. 2

   Add One Horizon App

   1. In ChatGPT Settings, go to Apps.
   2. Choose Create App.

   

   Enter the configuration:

   Name: One Horizon

   MCP Endpoint:

   https://mcp.onehorizon.ai/mcp

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   Authentication: OAuth. No client ID or secret required.

   
3. 3

   Authenticate

   The first time you use the tools in a chat, ChatGPT opens a browser window to sign in and authorize the connection.

   

   After authentication, ChatGPT shows the app and the actions it can perform. Review them before you continue.

   

   Developer Mode tools only work in regular chats, not Project chats or Deep Research. The first tool call may take longer to load.

What you can ask ChatGPT

"Show my planned work for this week"

ChatGPT pulls your assigned issues, calendar context, and todos from tools like Jira, Linear, and Google Calendar.

"Give me a team recap for last week"

ChatGPT compiles what each team member shipped and what's still open.

"What's blocking the frontend team"

ChatGPT lists current blockers and related context.

"Capture this as completed work"

ChatGPT summarizes the completed work and creates a completed task.

ChatGPT returns the tool response in the conversation.

Security and permissions

The connector acts on your behalf. Data access follows your roles, workspace membership, and granted scopes.

Troubleshooting