# Inventory GA4 audiences and their health

> Tier: recipe. Operating recipe: real tool sequence, core rules, known traps.

The audience estate with diagnostics, before activation decisions.

**Intent.** Which audiences exist, their sizes, their diagnostics.

## When to use

- Before audience-based campaigns.
- Quarterly hygiene.

## When not to use

- No specific contraindication beyond the preconditions below.

## Sources

Required: Google Analytics 4

## Preconditions

- The account is ticked in the dashboard, confirmed via list_accounts.

## Inputs

- `window`: Analysis window. Default: last 30 days.

## Procedure

1. List audiences via the admin inventory. — tools: `ga4_list_admin_resources`
2. Run audience diagnostics on the ones in use. — tools: `ga4_get_audience_diagnostics`

## Decision rules

- **When** An exported audience's definition references retired events → **conclude** It decays silently downstream: flag every destination using it.

## Evidence requirements

- Every figure carries its account, metric and window.
- Anything below a readable sample size is reported as unjudged, not as zero.

## Human approval boundary

- The readout changes nothing. Any change it motivates goes through Safe Writes: preview, human confirmation, then apply.

## Failure modes

- Membership duration caps make audiences smaller than their definition suggests.

## Output

- **Readout**: The figures, with windows and accounts named.
- **Flags**: What deserves a deeper skill or a human decision.