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Codex loads MCP servers from its config. Bridge to the hosted server with mcp-remote, which handles the OAuth flow and speaks stdio to Codex.

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Add the server

Add ContentHero to ~/.codex/config.toml: 
[mcp_servers.contenthero]
command = "npx"
args = ["-y", "mcp-remote", "https://mcp.contenthero.ai"]

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Authorize

The first run opens the OAuth consent page in your browser. Sign in with your ContentHero account and approve. mcp-remote caches the token, so you authorize once.

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Verify

Start Codex and ask it to read your ContentHero balance. It calls get_balance through the bridge and returns your credits.
The mcp-remote bridge is the universal way to reach a remote OAuth MCP server from a host that only speaks stdio. The same pattern works for any stdio-only host.