The problem
Sequencer SaaS tools charge per seat, own your data, and wrap a fairly simple loop: send step one, wait, send step two unless they replied.
What Claude Code did
Claude built the loop from scratch: Google OAuth to connect real Gmail accounts, a sequence builder with delays and conditions, scheduled sending that respects sane volumes, and reply detection so a response stops the sequence for that person. All of it runs on the same server as everything else, behind a sign-in.
The result
A working in-house sequencer where the data, the sending accounts, and the logic are all owned. No per-seat meter running.