Describe the job in Heidi Control: what it owns, which signals wake it, and where its ceilings sit. It starts at the watching tier regardless of your ambitions for it, and earns its way up on visible track record.
The setup is a job description, not a programming task: 'watch support for churn signals and brief me weekly' is a complete spec. The brain supplies the context; the trust system supplies the guardrails.
Start narrower than feels necessary. A small agent that nails one job earns trust fast, and widening a proven agent takes a minute; rescuing a sprawling one takes a month.