Codex
Codex, connected to the accounts around the code.
The same endpoint hands it your mail, calendar and web search.
Codex can work in a repo for hours, but it cannot see the accounts around the work: the mail that explains a change, the calendar that says when it ships, the docs on the live web.
gbrain connects on two sides. Point Codex at the endpoint and it can use those accounts mid-run, with every call logged and a permission deciding what it may touch. And your gbrain workspaces run OpenAI models, the same company behind Codex.