BuildAgentTools

Core tools

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Core tools are built-in tools the harness provides. They run during the call, and each is enabled automatically based on the agent’s settings and what’s attached, rather than added by hand.

Core toolWhat it doesEnabled when
End callLets the agent hang up when the conversation is finishedAlways available, it’s a required tool call
KB QuerySearches the attached knowledge base for answers to factual questionsA knowledge base is attached
Voicemail detectionDetects answering machines and leaves a voicemail”Voicemail” is enabled in settings
Language switchLets the agent change the spoken language mid-call”Switch language during call” is enabled in settings