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ChatGPT

Connect ChatGPT to One Horizon in Developer Mode. ChatGPT can use assigned issues, recent work, and workspace context to answer team questions, draft reports, surface blockers, and help plan work.

If you want to send implementation work straight into Codex from a work record, use the Codex integration.

Requires ChatGPT Plus or higher with Developer Mode enabled. Learn how to enable Developer Mode.

What is Developer Mode?

Developer Mode is a beta ChatGPT feature with Model Context Protocol (MCP) client support, including write actions. It lets ChatGPT interact with workspace data like Claude or Cursor.

Connecting

Step 1: Enable Developer Mode

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

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

Step 2: Add One Horizon App

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

Enter the configuration:

Name: One Horizon

MCP Endpoint:

https://mcp.onehorizon.ai/mcp
Copied!

Authentication: OAuth. No client ID or secret required.

ChatGPT new app

Step 3: Authenticate

When you first use the tools in a chat, ChatGPT will prompt you to authenticate. A browser window will open asking you to log in and authorize the connection.

Connect ChatGPT

After authentication, ChatGPT shows the app and the actions it can perform.

ChatGPT app settings

Review the available actions after authentication.

Developer Mode Limitations:

  • Only works in regular chats, not Project chats
  • Does not work in Deep Research mode
  • 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.

Tool calling in ChatGPT

ChatGPT returns the tool response in the conversation.

Using the connector in ChatGPT

Security and permissions

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

Troubleshooting

PreviousAgent AnalyticsNextClaude
Smithery

Smithery

Connect One Horizon through Smithery using the published One Horizon MCP server entry.

Claude Code

Claude Code

Connect Claude Code to One Horizon through MCP.

Claude

Claude

Connect Claude to One Horizon to report, summarize, and plan work.

Cursor

Cursor

Make Cursor understand and capture your work while you code.

  • What is Developer Mode?
  • Connecting
  • What you can ask ChatGPT
  • Security and permissions
  • Troubleshooting
  • Back to top