Building a campaign by hand is forty minutes of clicking where one wrong dropdown means the sequence sends its breakup email first.
What it handles
The mechanical work that is easy to get subtly wrong: leads uploaded and mapped to the right fields, sequence steps in order with the right delays, threading set so the follow up lands in the original thread and the breakup opens a new one, senders attached and rotated, schedule set for the right timezone.
None of that is difficult. All of it is a long chain of small choices where one mistake is invisible until the campaign is running.
What it is not for
It does not build or enrich leads, and it does not handle replies. Those are separate skills, deliberately. A single skill that sourced, built and sent would be one where nobody could point at the moment a decision was made.
Review before activation
The draft is presented for a human to walk through. Real sends start only after explicit sign-off, and that sign-off is a person clicking in the tool, not a parameter passed to a skill.
Runs well with
Skills compound. These are the ones we usually install alongside it.