List Harbor Actions

List a page of configured action identities for this Harbor without loading field metadata. Use a scoped credential belonging to this Harbor. An administrator must first select Connections and explicitly enable object operations and fields. These grants apply to existing and future eligible Harbor credentials without changing read access. Newly available objects and fields remain disabled until selected. Each entry identifies a configured operation by `connection_id`, `schema_id`, and `operation_id`. Search filters those identities. Follow `pagination.next_page_token` with the same search to read additional pages. Pages contain no field metadata and do not check remote provider availability. `unavailable: true` means the saved Connection cannot currently be resolved for actions; its permissions remain saved and revocable. Use [Describe action](../../../../api-reference/harbors/actions/describe) for the selected operation before [preparing an action](../../../../api-reference/harbors/actions/prepare). Description checks current capabilities and returns only enabled input fields. Always submit the intended Connection explicitly when preparing an action, even if only one is enabled. If several destinations match your intent, clarify which one to use. The supported provider actions remain Salesforce Opportunity updates (`NextStep` and `Description`) and HubSpot deal updates (`hs_next_step`). Listing does not expand those allowlists or authorize execution by a read-only credential. Send a new nonzero UUID in `X-Polytomic-Activity-Request-ID`. For direct REST requests, `X-Polytomic-Harbor-Session` is optional. If supplied, the session must be active and bound to the credential and Harbor. Discovery is recorded as `action.listed`; no response is returned if that event cannot be recorded.