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.

Getting Started After Setup¶

Unlike Claude Desktop, ChatGPT does not display slash commands. Instead, use natural language to trigger the same actions:

Instead of...	Say...
`/setup`	"Help me set up my seller agent"
`/status`	"Show me my seller agent status"
`/inventory`	"What inventory do I have?"
`/deals`	"Give me a deal status report"
`/queue`	"Show me what's in my inbound queue"
`/new-deal`	"Help me create a new deal"
`/configure`	"Show me my automation rules"
`/buyers`	"Who's been looking at my inventory?"
`/help`	"What can you do?"

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 41 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 82 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.