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If your ChatGPT workspace permits custom MCP connections, enable Developer mode under Settings → Security and login. Open the ChatGPT Plugins page, add a connection named Jointl, and enter the complete Streamable HTTP endpoint https://mcp.join.tl/. Review the requested scopes and discovered tools, then complete Jointl authorization in the browser. Follow the official OpenAI connection instructions if the ChatGPT navigation changes. The access request must target the MCP resource, not the REST audience. Available tools reflect the authorizing member’s active Jointl permissions. Before a write, ChatGPT should present the preparation preview and ask for explicit approval. Approval of one preview does not authorize a changed input or later action.