Multiple Gmail accounts, one MCP.
Codex only connects one Gmail account at a time. Mailroom gives Codex and Claude Code the normal Gmail tools across all of yours. It runs locally on macOS.
Paste into Codex or Claude Code
Install or safely update Mailroom from https://github.com/JacbK/mailroom in ~/.mailroom. Ask which Gmail accounts I want to add, then run ~/.mailroom/setup --shared with one --account alias=email flag for each account. Keep going until ~/.mailroom/setup --doctor is healthy. I'll handle Google sign-ins.