📖What it is

Sends every message to outside helpers down one safe, reliable line.

Think of it as the single phone switchboard the whole team uses to reach outside services. If one line is busy or down, it automatically retries or waits and tries again, so calls rarely fail. Every worker that needs to talk to an outside service goes through here.

🔌Who calls it (1)

Worked out from who actually calls it, not from a note somebody wrote.

🧮Other external io machinery