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Knowledge Bases

Voice agents can use the same Knowledge Bases as text-based agents. Attach KBs from the Knowledge & Tools section of the configuration screen.

How to attach​

  • Open the Knowledge Base picker in the configuration screen.
  • Select one or more KBs from the workspace.
  • Multiple KBs can be attached — the agent retrieves across all of them.

The picker UI matches the standard agent KB selection experience. See Knowledge Bases for how KBs themselves are created and processed.

KB retrieval during a call​

  • Retrieval happens as part of the LLM reasoning step for each turn.
  • KB retrieval runs synchronously inside the voice runtime — there is no separate KB-only queue path for voice.
  • The retrieval result feeds into the LLM context for that turn.

Cost​

KB retrieval calls are billed under the standard Knowledge Base pricing — they are not included in the per-second voice rate. See Pricing for the full breakdown.

In the run trace​

KB retrieval shows up as part of the LLM reasoning span in the Run history & traces view, with retrieved chunks visible for debugging.