Source: https://dealerclaw.dev/tools/connect/chatgpt # Connect ChatGPT and Codex to DealerClaw Follow the ChatGPT plugin walkthrough, or use the desktop and terminal setup for Codex. ## Choose the setup for where you work For ChatGPT on the web, add a custom MCP plugin. For local Codex work, use the MCP server settings or terminal commands below. A local Codex configuration does not by itself create a plugin in ChatGPT web. You need a DealerClaw account with business setup completed. Custom plugins and MCP connections must also be allowed by your OpenAI account and workspace. ## ChatGPT on the web ### 1\. Open the Plugins directory While signed in, open [ChatGPT Plugins](https://chatgpt.com/plugins) . Select **Add** (the plus button), then **Add custom MCP server**. [![ChatGPT Plugins Add menu with Add custom MCP server](https://dealerclaw.dev/tools/connect/assets/chatgpt-menu.jpg)](https://dealerclaw.dev/tools/connect/assets/chatgpt-menu.jpg) Actual ChatGPT plugin menu, captured October 15, 2026. Select the image to enlarge. ### 2\. Fill in the connection Use **DealerClaw** as the name. The description can be **Dealership tools for your agent.** Keep **Server URL** selected, enter the address below, and choose **OAuth** for authentication. Server URL [![ChatGPT custom MCP server form with DealerClaw name, public server URL and OAuth selected](https://dealerclaw.dev/tools/connect/assets/chatgpt-server.jpg)](https://dealerclaw.dev/tools/connect/assets/chatgpt-server.jpg) The optional icon can be left empty. Select the image to enlarge. ### 3\. Review automatic OAuth registration Open **Advanced OAuth settings** and let discovery finish. **Registration method** should be **Dynamic Client Registration (DCR)**. DealerClaw’s authorization and registration endpoints are filled in automatically. A message that CIMD is unavailable is expected for this server. Use DCR; leave the discovered settings in place rather than entering your own client ID or secret. [![ChatGPT advanced OAuth settings with Dynamic Client Registration selected for DealerClaw](https://dealerclaw.dev/tools/connect/assets/chatgpt-oauth.jpg)](https://dealerclaw.dev/tools/connect/assets/chatgpt-oauth.jpg) DealerClaw’s live discovery selected DCR in this capture. Select the image to enlarge. ### 4\. Create the plugin and connect your account Review ChatGPT’s connection warning. If you agree, select **I understand and want to continue**, then **Create as a plugin**. Open the resulting personal plugin and install it. Complete the DealerClaw sign-in when prompted and review the permissions. Use your DealerClaw account, even if its sign-in email differs from your ChatGPT account. ### 5\. Select DealerClaw in a conversation Start a new ChatGPT Work conversation. Type **@** in the message box and select DealerClaw. Ask for the dealership task you want help with. The available tools depend on your account and the permissions you approved. ## Codex on your computer The local desktop app, Codex CLI and IDE extension share MCP configuration on the same Codex host. This differs from creating a ChatGPT web plugin. ### Desktop settings Open **Settings / MCP servers / Add server**. Name the server **dealerclaw**, select **Streamable HTTP**, and enter `https://app.dealerclaw.dev/mcp`. Save it, restart when prompted, then select **Authenticate** if sign-in is required. Complete the DealerClaw browser authorization. ### Terminal setup If you use the Codex CLI, run: ``` codex mcp add dealerclaw --url https://app.dealerclaw.dev/mcp ``` If authorization has not already opened, run: ``` codex mcp login dealerclaw ``` Finish signing in to DealerClaw in your browser and return to Codex. Use `/mcp` inside Codex to view its configured servers. These commands use the installed Codex CLI; you do not need a separate OpenAI API key for the DealerClaw connection. A remote Codex host has its own configuration. If you change machines or execution hosts, check that host’s MCP settings. ## If setup stops Add custom MCP server is missing Confirm you are signed in to the intended ChatGPT workspace. Custom MCP plugin access is controlled by account availability and workspace policy; ask your administrator if the Add option is unavailable. The form asks for a client ID or secret Check the full server URL, select OAuth, and wait for discovery in Advanced OAuth settings. Choose Dynamic Client Registration (DCR). DealerClaw advertises a registration endpoint, so customer-created credentials are not required. I installed the plugin but cannot use it in chat Start a new Work conversation and select DealerClaw with @. A plugin being created, installed and signed in are separate steps. If your account asks you to connect, complete the DealerClaw sign-in. Codex works but ChatGPT web does not show DealerClaw A local MCP entry is configuration for that Codex host. Follow the ChatGPT plugin steps above for ChatGPT web, or use the local Codex client where you added the server. ## Sources and screenshots Instructions checked October 15, 2026. Product labels can change. - [OpenAI: connect a custom MCP plugin](https://developers.openai.com/plugins/deploy/connect-chatgpt) - [OpenAI: install and select a plugin in ChatGPT Work](https://developers.openai.com/plugins/quickstart) - [OpenAI: desktop and Codex MCP configuration](https://learn.chatgpt.com/docs/extend/mcp?surface=cli) ## Need help connecting? [Contact DealerClaw](https://dealerclaw.dev/contact) with the client you are using and the error message you see. Leave passwords, tokens and client secrets out of your message.