# Trend diffing

A reusable skill the "Weekly support-ticket synthesis for product" recipe pulls in. Add it once and every agent on the team can use it.

Compare this week's theme volumes against the last digest to surface real movement.

## Method
1. Load last week's saved digest from reports/voc-digest/.
2. Match this week's themes to last week's by root cause, not by label text.
3. Compute the change in ticket count per theme: grew, shrank, unchanged, new.
4. Track how many consecutive weeks a theme has appeared, even as its ticket count fluctuates.
5. Note whether a shrinking theme is resolved (fixed) or just quiet this week.
6. Save this week's digest as the baseline for next week's diff.

## Rules
- Always diff against the immediately prior digest, never an older one.
- A theme counts as "new" only if it did not appear in the prior digest under any label.
- Track consecutive-week streaks precisely — the escalation threshold depends on this count.
- Keep every weekly digest on file for the running trend history.

## Output
A trend line per theme: grew, shrank, unchanged, or new, plus its consecutive-week streak.