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Codex stores MCP configuration in ~/.codex/config.toml. Use the Codex CLI to add the hosted Lightsage MCP endpoint and complete OAuth sign-in.
1

Add Lightsage MCP

Add Lightsage as a remote HTTP MCP server:
2

Sign in with OAuth

Start the OAuth flow and approve access to your Lightsage organization:
3

Verify Codex tools

Confirm Codex can read the server config:
The lightsage entry should use https://mcp.lightsage.com/mcp and show OAuth under authentication.In an interactive Codex session, run /mcp to confirm the server is available.Then run a read-only prompt:
See the Codex MCP docs for the full configuration reference.