Returns the cost, in USD, of the external tools your agents call, grouped by tool provider (such as a web search API or a data provider), split into time buckets (hourly, daily or monthly, depending on the length of the date range). Use providers to keep only some tool providers. For one figure per group over the whole period, a far smaller answer over a long date range, use get_cost_by_tool_provider_aggregated, which does not take providers.