Gantt charts in ChatGPT
Developer mode connector — web only
Add the server once and ChatGPT can schedule a whole project for you — dependencies, working calendars, resource levelling and critical path — then hand back a shareable chart plus PNG, SVG and CSV exports.
Set it up in 5 steps
Requires: ChatGPT Plus, Pro, Business, Enterprise or Edu on the web. Developer mode is in beta, and on workspace plans an admin has to enable it before the toggle appears.
In ChatGPT on the web, open Settings > Security and login and turn on Developer mode. (If you don't see it, an older build puts it under Settings > Apps & Connectors > Advanced, and on a workspace plan an admin must enable it first.)
Go to the ChatGPT Plugins settings page and click the plus button to create a developer-mode app.
Apps / plugins settings page https://chatgpt.com/pluginsEnter a user-facing name (gantt) and description, then under Connection choose the public-endpoint option and paste the MCP server URL including its full path. Leave any OAuth client ID / secret fields empty — ChatGPT discovers the auth server from /.well-known/oauth-protected-resource and self-registers via dynamic client registration.
MCP server URL (include the full path) https://gantt.nare.li/api/mcpCreate the connection, complete the browser consent prompt when ChatGPT redirects you, then review the tools and metadata it discovered from the server.
Start a new chat, open the plus / tools menu in the composer, and enable gantt under Developer mode.
Leave the OAuth client id and secret empty — ChatGPT discovers the authorization server from the protected-resource metadata and registers itself.
Once it is connected
Ask ChatGPT: “Plan a 6-week website rebuild for a team of four and give me the chart.”