Update an existing workflow trigger activation: edit name/description/prompt/plan/schedule/channels, or change lifecycle status (ACTIVE/PAUSED/CANCELLED). trigger_id is required and must be the activation config UUID from list_workflow_triggers.id or create_workflow_trigger.trigger_id — never catalog_id. Only set fields that changed. SCHEDULED: any new cron / one_time_fire_at must be absolute UTC. WEBHOOK triggers have no cron — do not add cron when list shows trigger_kind=WEBHOOK; change prompt/channels/status only (supported_events are fixed on the catalog from create/template). Prefer list_workflow_triggers first to load id (as trigger_id) and trigger_kind.

Use when: Use to edit an existing live activation, or pause/resume/cancel it. trigger_id = list_workflow_triggers.id (the config UUID). Do NOT pass catalog_id as trigger_id. First-time opt-in of a WORKSPACE_OPT_IN template uses create_workflow_trigger with catalog_id instead. Call list_workflow_triggers first if you don't have the config id. For WEBHOOK rows, never invent a schedule.

Behavior: idempotent

workspace_id / user_id are injected from request headers.

Also returns pagination info (name, description, enabled, last_run_at, last_run_status, status, prompt, source, id, allowed_channels, selected_channels, cron, recurring, adhoc, config_status, plan, channel_metadata, agent_thread_id, editable, metadata, test_mode, test_cron, test_lead_minutes, test_recipients, scope, created_by, created_by_user_name, owner_user_id, owner_user_name, activation_mode, principal_type, catalog_id, audience_type, is_template, audience_filter, trigger_kind).