list_segments

List the account's saved Insights (Spotlight) account-journey segments: {id, name, status, last_update_date}.

Segments are shared with the SaaS UI (Spotlight > Journey), so a marketer may already have the one you need: check here BEFORE create_segment and reuse instead of creating a near duplicate.

`name` filters fuzzily (case-insensitive contains or a close match). An empty list means the account has no segments yet, not an error: create one with create_segment when the ask needs it. Creating needs an ACTIVE Insights (Spotlight) subscription on the account: create_segment checks it first and refuses with the subscription state when it is expired or missing. Relay that to the user instead of retrying; existing segments stay usable either way.

STATUS: READY can be used; PENDING is still extracting a CRM field (re-check later); FAILED cannot back an audience.

NEXT: get_segment_criteria(segment_id, lookback_window) to read a segment's filter and how many accounts it matches in a window; create_audience_from_segment to turn it into an audience; get_insights_report(criteria=...) to browse its accounts.