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  "path": "/t/developer-mcp-obsidian-connector-works-in-one-project-but-fails-in-another/1381738#post_1",
  "publishedAt": "2026-05-25T12:37:57.000Z",
  "site": "https://community.openai.com",
  "textContent": "Hi everyone,\n\nI’m using a custom Developer MCP connector for Obsidian. The connector works correctly in some ChatGPT chats and in at least one ChatGPT Project, but fails in another Project.\n\n### Connector details\n\nThe connector is an Obsidian vault connector running as a Developer MCP / custom app.\n\nIt exposes tools such as:\n\n  * `obsidian_list_notes`\n  * `obsidian_global_search`\n  * `obsidian_read_note`\n  * `obsidian_update_note`\n  * `obsidian_search_replace`\n  * `obsidian_delete_note`\n\n\n\nThe app is in development mode.\n\n### Expected behavior\n\nI expected the same Obsidian connector to be available and callable in all Projects where Developer MCP / custom apps are supported.\n\nIn the working Project, ChatGPT can list, search, read, and update Obsidian notes.\n\n### Actual behavior\n\nIn another specific Project, the same connector either does not appear at first or fails when ChatGPT tries to call it.\n\nWhen ChatGPT tries to call:\n\n`/Obsidian/obsidian_list_notes`\n\nI get this error:\n\n`FORBIDDEN: This conversation does not support developer MCPs`\n\nGoogle Drive and Google Sheets work in the same problematic Project, so this seems specific to Developer MCP support rather than all connectors.\n\n### My question\n\nIs Developer MCP support controlled per Project, per chat, per workspace, or by Project type?\n\nCan an existing Project be updated to support Developer MCPs, or do I need to create a new Project?\n\nAlso, are there known limitations when a Project uses custom instructions, custom GPT/Gizmo configuration, or other tools that prevent Developer MCP connectors from being used?\n\nAny guidance or workaround would be appreciated.",
  "title": "Developer MCP Obsidian connector works in one Project but fails in another"
}