Codex CLI

OpenAI's agentic coding CLI for software engineering tasks.

Setup

1. Add the MCP server — Add the following to ~/.codex/config.toml:

[mcp_servers.secureauth]
url = "https://your-gateway-url/gateway/mcp"

2. Authenticate

codex mcp login secureauth

3. Start Codex

codex

The agent is auto-registered on first connect.

Connecting to just one MCP? To stay under an agent's tool limit, point the URL at a single MCP — /gateway/mcp/{slug} instead of /gateway/mcp. Grab the exact URL from the resource's detail page; see Scope a connection to one MCP.