# Week-over-week diff

A reusable skill the "Score every account's renewal risk weekly" recipe pulls in. Add it once and every agent on the team can use it.

Compare this week's scores against last week's snapshot so only real change gets surfaced.

## Method
1. Load last week's snapshot from reports/renewal-risk/.
2. Compare each account's current tier against its prior tier.
3. Group the results: moved up a tier, moved down, new to the portfolio, unchanged.
4. Surface only accounts that moved or are newly high-risk in the escalation.
5. Note the specific signal that changed for every account in the moved group.
6. Save this week's full snapshot for next week's comparison.

## Rules
- Always diff against the immediately prior week's snapshot, never an older one.
- Report unchanged accounts as a count only, not individually, to keep the escalation short.
- A newly high-risk account needs two independent signals before it counts as "moved."
- Keep every weekly snapshot on file — never overwrite or discard past history.

## Output
A diff summary: accounts moved up, moved down, new, and recovered, versus last week.