ChatGPT, Codex & AI IDE Setup Guide¶

Connect your seller agent to ChatGPT, OpenAI Codex, Cursor, Windsurf, or any MCP-compatible AI assistant.

Prerequisites¶

Same as Claude Desktop Setup — your developer must have deployed the seller agent and generated credentials.

Your seller agent MCP endpoint: https://your-publisher.example.com/mcp/sse

ChatGPT¶

ChatGPT natively supports MCP servers via Developer Mode.

Step 1: Enable Developer Mode¶

Open chatgpt.com
Go to Settings > Apps & Connectors > Advanced settings
Toggle Developer Mode on

Available on Plus, Pro, Business, Enterprise, and Education plans.

Step 2: Add the Seller Agent¶

Go to Settings > Connectors (or Settings > Apps)
Click Create
Enter your MCP server URL: https://your-publisher.example.com/mcp/sse
Name it: Seller Agent
Add a description: Manage publisher inventory, deals, pricing, and buyer relationships
Click Create

Step 3: Use in a Chat¶

Start a new chat
Click the + button at the bottom
Select your seller agent from the More menu
Start chatting: "Show me my media kit" or "Create a PMP deal for GroupM at $28 CPM"

ChatGPT will call your seller agent's MCP tools and show the results inline.

OpenAI Codex¶

Codex supports MCP servers via its config file.

Option A: CLI¶

codex mcp add seller-agent --url https://your-publisher.example.com/mcp/sse

Option B: Config File¶

Edit ~/.codex/config.toml (global) or .codex/config.toml (project):

[mcp_servers.seller-agent]
url = "https://your-publisher.example.com/mcp/sse"
bearer_token_env_var = "SELLER_AGENT_API_KEY"

Set the environment variable:

export SELLER_AGENT_API_KEY="sk-operator-XXXXX"

Verify¶

In Codex, type /mcp to see connected servers and available tools.

Cursor¶

Cursor supports MCP servers on all plans (including free).

Option A: Project-Level Config¶

Create .cursor/mcp.json in your project root:

{
  "mcpServers": {
    "seller-agent": {
      "url": "https://your-publisher.example.com/mcp/sse",
      "headers": {
        "Authorization": "Bearer sk-operator-XXXXX"
      }
    }
  }
}

Option B: Global Config¶

Create ~/.cursor/mcp.json with the same format.

Using Environment Variables¶

{
  "mcpServers": {
    "seller-agent": {
      "url": "https://your-publisher.example.com/mcp/sse",
      "headers": {
        "Authorization": "Bearer ${env:SELLER_AGENT_API_KEY}"
      }
    }
  }
}

Windsurf¶

Windsurf supports MCP via its Cascade panel.

Option A: MCP Marketplace¶

Click the MCPs icon in the top-right of the Cascade panel
Search for your seller agent or click Add Custom
Enter the MCP URL and credentials

Option B: Config File¶

Edit ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "seller-agent": {
      "serverUrl": "https://your-publisher.example.com/mcp/sse",
      "headers": {
        "Authorization": "Bearer sk-operator-XXXXX"
      }
    }
  }
}

Available Tools (All Platforms)¶

Once connected, all platforms have access to the same 45+ MCP tools:

Category	Examples
Setup	`get_setup_status`, `health_check`, `get_config`
Inventory	`list_products`, `sync_inventory`, `list_inventory`
Media Kit	`list_packages`, `create_package`
Pricing	`get_rate_card`, `update_rate_card`, `get_pricing`
Deals	`create_deal_from_template`, `push_deal_to_buyers`, `distribute_deal_via_ssp`, `migrate_deal`, `deprecate_deal`
Approvals	`list_pending_approvals`, `approve_or_reject`
Buyers	`list_buyer_agents`, `register_buyer_agent`, `set_agent_trust`
Curators	`list_curators`, `create_curated_deal`
SSPs	`list_ssps`, `troubleshoot_deal`

See the MCP Protocol Reference for the full tool catalog.

REST API Alternative¶

If your platform doesn't support MCP, you can use the REST API directly:

Base URL: https://your-publisher.example.com
Auth: Authorization: Bearer sk-operator-XXXXX

The seller agent exposes 70+ REST endpoints. See the API Overview.

For ChatGPT specifically, you can also create a Custom GPT with Actions pointing to the REST API's OpenAPI spec at https://your-publisher.example.com/openapi.json.