Read ServiceNow records. action=query (list records matching an encoded query), action=get (one record by sys_id), action=count (how many match). Use this instead of a separate tool per table.

Change ServiceNow records. action=create, action=update, action=delete, or action=batch (apply many operations in ONE request). Every write needs confirm=true, and every write is journalled so it can be reverted.

Aggregate over a table. action=stats (COUNT/SUM/AVG/MIN/MAX) or action=group (grouped statistics). One call answers 'how many', 'how many per group' without pulling records.

Introspect the instance's data model. action=tables (list tables), action=fields (a table's dictionary entries), action=class (a CMDB class definition), action=references (who references a field).

Work the CMDB Service Graph. action=relations (a CI's edges), action=traverse (walk outward), action=dependents (what breaks if this CI goes away), action=impact (what depends on a table, field or script), action=csdm (the Common Service Data Model domains).

Service Catalog. action=items (browse), action=categories, action=variables (an item's form fields), action=order (submit an order - needs confirm=true).

Record attachments. action=list, action=download, action=upload (needs confirm=true), action=delete (needs confirm=true).

Find the instance's own automation. action=search (scripts mentioning a string), action=list (artefacts of a kind), action=read (one artefact), action=where_used (every reference to a name; scope='code' searches only the scripts, scope='schema' only the dictionary, empty searches both).

Instance operations. action=log (system log), action=health (version and key stats), action=jobs (scheduler queue), action=properties (system properties, secrets masked), action=stats (aggregate counts).

Read what the server already knows. action=note_read, action=note_search, action=note_list, action=saved_list, action=saved_run (run a saved query), action=history (what was already called), action=cache_get, action=cache_list.

Write to the server's own local memory. action=note_write, action=note_delete, action=saved_save, action=cache_put. Nothing here touches the ServiceNow instance.

The write journal. action=journal (list applied writes and how to revert them), action=undo (revert one - needs confirm=true, and it changes the instance).

Administrative surfaces. action=update_sets, action=set_update_set (bind writes to an update set - needs confirm=true), action=script (run a server-side script - needs confirm=true), action=atf (run tests - needs confirm=true), action=users, action=groups, action=roles, action=memberships.